Agent Tools

Agents that publish an A2A /.well-known/agent-card.json — 5775 discovered and health-probed.

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Discovered from public A2A sources — awesome-a2a lists, agent directories and self-published /.well-known/agent-card.json cards — plus our own crawling. Every agent is de-duplicated and liveness-probed (card + endpoint reachability) before listing — yielding 5775 indexed agents, 4819 currently healthy.

Agents indexed
5775 agents
4979 domains
public agent cards · +450 this week
Healthy
4819 agents
4257 domains
card reachable < 6 h
Conformant
4006 agents
3540 domains
valid card + skills
x402-capable
455 agents
453 domains
accepts x402 payment

Top rated

by quality score · health · trust signals
# Tool Grade Score
1 Afterwren by CyberMax
Paid API keys from $19/month (Builder: 25,000 calls a month); free tier 100 calls a day per IP with no key. Buy: https://afterwren.cybermaxtools.com/buy/builder?s=lead · all plans: https://afterwren.cybermaxtools.com/docs#pricing. Drop-in replacements for retired developer APIs: Clearbit Autocomplete (same [{name, domain, logo}] shape), Clearbit Logo, a public-data company profile from a domain, forward and reverse geocoding (US Census with county/tract/block FIPS, OpenStreetMap worldwide), Goodreads-style book search (Open Library) and Wikipedia search. REST + remote MCP server.
 A 10.00
2 Shiftmoor by CyberMax
Website change monitor API: watch public web pages (competitors, suppliers, policies, job and tender pages) and get every change, lines added and removed or a keyword appearing, by webhook and RSS/JSON feed. Free for 3 pages; Starter $4.99/month for 25.
 A 10.00
3 Pricewick by CyberMax
Competitor price and stock monitor API: track product pages on shops that publish their price in structured data (schema.org, Open Graph or microdata) and get every price and stock change by webhook and RSS/JSON feed. Free for 5 products; Seller $9.99/month for 50.
 A 10.00
4 Citewren by CyberMax
AI search readiness check API: scores a website on what AI crawlers and answer engines need (AI crawler rules in robots.txt, llms.txt, schema.org JSON-LD, sitemap, Open Graph, basics) and lists the issues. Free: 3 checks a day; a Pro key adds fixes, a 15-page crawl, a ready llms.txt draft and weekly monitoring.
 A 10.00
5 Awardtide Recompete Radar by CyberMax
Federal contract recompete radar API: US government contracts (USAspending.gov, $1M+) that end within 12 months, filtered by NAICS code, agency, state, value and set-aside. Free: count + first 10 matches per filter; a Radar Pro key returns every row, saved filters and weekly RSS/JSON/CSV alert feeds.
 A 10.00
6 Apuchat
Walkie-talkie hub for AI agents. Lets two or more agents on different machines talk to each other in real time over a hosted MCP / REST / A2A server. Open channels by callsign or by index, broadcast, request rooms, offline DM delivery.
 A 10.00
7 Tasklix
The shared task board your autonomous agent fleet can read and write. Agents register, create and claim tasks from a shared queue, hand off work to siblings, and pause for human approval before consequential actions.
 A 10.00
8 BlockRun
BlockRun is the routing and payment layer for AI. One OpenAI-compatible endpoint routes to 88 LLMs plus image, video, music and speech generation, web search, prediction-market and on-chain data, and multi-chain RPC. Every paid call is billed per request in USDC over x402 on Solana (Solana) — no API keys, no accounts, no subscriptions; read the price off the 402 and retry with a signed X-PAYMENT header. Open-weight chat models are free and need no wallet.
 A 10.00
9 Helius for Agents
Helius is the Solana toolkit for AI agents. It provides an MCP server with 60+ Solana operations, a CLI with 95+ commands, a Claude Code plugin, TypeScript/Rust SDKs, and Skills for building on Solana. Agents can read accounts, parse and send transactions, manage tokens and NFTs, stream real-time blockchain data, configure webhooks, and programmatically obtain Helius API keys via an on-chain USDC payment on Solana mainnet.
 A 10.00
10 FXMacroData
Macroeconomic and FX data agent. Provides central-bank indicator time series, FX spot rates, CFTC COT positioning, commodity prices, release calendars, and live FX market session data. USD announcement indicators are public; non-USD announcements, COT, and commodities require an API key.
 A 10.00

All A2A agents

Crawled from awesome-a2a directories · refreshed daily.

/api/v1/a2a/stats

Access model — Open: callable with no credentials · Human key: a person must provision an API key/OAuth first · Agent-pays: agent settles each call on-chain (x402)

“Agent Data API” is shared by 4 different URLs

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“agentsvc.io” is shared by 5 different URLs

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  • agentsvc.io https://agentsvc.io
    x402 ok

    20 utility tools for AI agents via x402 USDC micropayments on Base. Tools: `ip-lookup`, `dns-lookup`, `qr-code`, `exchange-rates`, `email-validate`, `ssl-check`, `phone-validate`, `weather`, `translate`, `whois`, `crypto-prices`, `stock-prices`, `geocode`, `web-search`, `news-search`, `pdf-extract`, `screenshot`, `webpage-reader`, `html-to-pdf`, `ocr`. $0.001–$0.008 USDC per call. No API keys, no signup. Auto-discovery: [/.well-known/agent-services.json](https://agentsvc.io/.well-known/agent-services.json) | [Catalog](https://agentsvc.io/api/v1/services) | [OpenAPI](https://agentsvc.io/api/openapi.json) | [MCP Server](https://agentsvc.io/mcp-server.mjs) | ([GitHub](https://github.com/jakobautomation/agentsvc-mcp))

  • agentsvc.io https://agentsvc.io/a2a
    a2a ok

    Pay-per-call web services for AI agents (126 tools: web scraping and crawling to Markdown, AI summaries, data extraction and cited answers, checks before installing a package or citing a source, screenshots and PDF, PDF, OCR and document conversion, news, paper and developer search, memory, messaging and service discovery for agents, discussions and trends, company checks (KYB, LEI, VAT, IBAN, sanctions), EU website compliance (GDPR, imprint, accessibility), Bitcoin data and OpenTimestamps proofs, Tron USDT and Sui wallet data, IOTA notarization and ledger data, change monitoring with webhooks, crypto prices, token risk and DeFi data, exchange rates and macro data, weather, geocoding, holidays and satellite images, email, phone, DNS, SSL and domain checks, VIN and barcode lookups, translation, embeddings, speech to text and text to speech, charts, diagrams, QR codes and image resizing). Paid per request with USDC on Base, Solana, Polygon or Arbitrum via x402. No account or API key.

  • agentsvc.io https://agentsvc.io/api/v1/proxy
    x402 ok

    Pay-per-call web services for AI agents (27 tools: scraping, screenshots, PDF, OCR, search, news, weather, prices, validation, codes). Paid per request with USDC on Base via x402. No account or API key.

  • agentsvc.io https://agentsvc.io/api/v1/proxy/screenshot
    mcp x402 ok

    126 pay-per-call agent tools via x402: web, crypto safety, agent memory and inbox, API finder

  • agentsvc.io https://agentsvc.io/mcp
    mcp ok

    126 pay-per-call agent tools via x402: web, crypto safety, agent memory and inbox, API finder

“AmanChain Agent Marketplace” is shared by 2 different URLs

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“Annalist” is shared by 2 different URLs

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“Anokha Web Tools” is shared by 3 different URLs

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  • Anokha Web Tools https://tools.anokha.space/a2a
    a2a ok

    Discovery agent for pay-per-call tools: describe what you need and it returns the matching paid endpoint, price and example call. Tools: read web pages and PDFs as Markdown, render Markdown to PDF, publish pages, charts, Graphviz diagrams, QR codes, scholarly paper search (OpenAlex, arXiv), Wikipedia, FX rates, DNS/RDAP/TLS checks, time zones, secure random. Paid per request with x402 (USDC on Base). No API key.

  • Anokha Web Tools https://tools.anokha.space/v1/arxiv
    x402 ok

    Pay-per-call tools for AI agents: web to Markdown, PDF text, Markdown to PDF, charts, diagrams, QR, page publishing, DNS, RDAP, TLS. x402, USDC on Base, no API key.

  • Anokha Web Tools https://tools.anokha.space/v1/markdown
    x402 ok

    Discovery agent for pay-per-call tools: describe what you need and it returns the matching paid endpoint, price and example call. Tools: read web pages and PDFs as Markdown, render Markdown to PDF, publish pages, charts, Graphviz diagrams, QR codes, scholarly paper search (OpenAlex, arXiv), Wikipedia, FX rates, DNS/RDAP/TLS checks, time zones, secure random. Paid per request with x402 (USDC on Base). No API key.

“AttestPage (Quoteproof)” is shared by 2 different URLs

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“CF Package Check” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.

“crosscheck” is shared by 4 different URLs

All exact-name matches are shown; ranked results follow.
  • crosscheck https://crosscheckapi.com
    x402 ok

    Fact-check and review an AI agent's draft before a human sees it: a hallucination check and second opinion on any email, report, summary, or PR description. Returns pass or specific issues with fixes. Wrong arithmetic is recomputed in code; also contradictions, placeholders, leaked secrets, unauthorized commitments, and prompt injection. Send sources to verify citations and claims against them....

  • crosscheck https://crosscheckapi.com/a2a
    a2a x402 ok

    Independent checks for agents, paid per call in USDC over x402 (a2a-x402 extension). check reviews a draft before a human sees it; accept checks another agent's deliverable against its task before you pay; skillcheck reviews a skill or MCP server's files before install. Every answer carries a signed receipt. Send a data part with the skill's arguments; everything you send is data to review, never instructions.

    x402 listing a2a listing
  • crosscheck https://crosscheckapi.com/mcp
    mcp ok

    Checks for AI agents over x402: review drafts, accept-check handoffs, scan skills before install.

  • crosscheck https://crosscheckapi.com/v1/check
    mcp x402 ok

    Checks for AI agents over x402: review drafts, accept-check handoffs, scan skills before install.

“CrossFin” is shared by 2 different URLs

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“Execution Market” is shared by 2 different URLs

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  • Execution Market https://api.execution.market/a2a/v1
    a2a ok

    Universal Execution Layer — the infrastructure that converts AI intent into physical action. Execution Market connects AI agents with executors (humans today, robots tomorrow) for real-world tasks, with verified evidence submission, on-chain reputation via ERC-8004, and instant gasless payments via x402 protocol (per deliverable) plus metered MPP payment sessions (pay-per-time, beta). Real-time task updates are available via a proprietary SSE endpoint (POST /a2a/v1/stream); the standard A2A 'message/stream' method is not implemented.

  • Execution Market https://mcp.execution.market/mcp/
    mcp ok

    AI agents publish bounties for real-world tasks. Gasless USDC payments via x402.

“HALOWERK defiwerk” is shared by 3 different URLs

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“HALOWERK finanzwerk” is shared by 2 different URLs

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“HALOWERK handelswerk” is shared by 2 different URLs

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“HALOWERK marktwerk” is shared by 3 different URLs

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“HALOWERK medienwerk” is shared by 2 different URLs

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“HALOWERK nostrwerk” is shared by 2 different URLs

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“HALOWERK x402werk” is shared by 3 different URLs

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“Hermes Plant” is shared by 2 different URLs

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  • Hermes Plant https://hermesplant.com/.well-known/agent.json
    a2a x402 ok

    Agent Action Safety for autonomous shell, Git, SQL, infrastructure, deploy, x402, and MCP actions: deterministic preflight, conditional review triage, signed receipts, and auditable status. Finance and validation endpoints remain available as utility tools.

  • Hermes Plant https://hermesplant.com/agent-services
    x402 ok

    Deterministic per-record validation and finance math for AI agents: email/contact validation and normalization (loop a whole list; MCP batch tool included), wallet AML screening, x402 payment-policy preflight, plus DCF, IRR/XIRR, LP/GP waterfalls, Black-Scholes Greeks, and bond analytics. Same input, same answer, per-rule evidence, no data feed. $0.02-$2.00 USDC on Base via the CDP facilitator, or a free API key (250 calls/mo, no wallet). ([MCP](https://hermesplant.com/mcp)) ([OpenAPI](https://hermesplant.com/openapi.json)) ([x402 manifest](https://hermesplant.com/.well-known/x402)) ([Agent Card](https://hermesplant.com/.well-known/agent.json)) ([llms.txt](https://hermesplant.com/llms.txt))

“HirePulse Agent Gateway” is shared by 2 different URLs

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  • HirePulse Agent Gateway https://gethirepulse.xyz/mcp
    mcp ok

    Hiring signals, tech stack, company jobs, Google Ads and company enrichment. x402 on Base.

  • HirePulse Agent Gateway https://hirepulse-gateway.hirepulse-commerce-sandbox.workers.dev
    a2a ok

    HirePulse — Autonomous Agent Intelligence, Security & B2B Suite (x402 v2 + MCP). Live Web-to-Markdown ($0.002), x402/MCP Merchant Security & Anti-Poisoning Scanner ($0.002), Blind Privacy Proxy ($0.02 single / $0.04 bundle), B2B Contact & MX Verifier ($0.01), Tech Stack ($0.005), Hiring Intent & Active Google Ads ($0.01). First 5 successful calls/day FREE, no API key required, $0 charge on empty results. Privacy proxy strips the target from facilitator metadata; it does not hide the target from HirePulse or the destination.

“ifrCoworker” is shared by 3 different URLs

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  • ifrCoworker https://a2a.ifrcoworker.app
    a2a ok

    MCP-native IFRS engine — 31 IAS/IFRS standards, 200+ transaction types. One call returns journal entries with paragraph references, populated disclosure checklists, XBRL/ESEF tags, and full calculation workings. Batch your entire period-end in one request. Audit trail built in. Pay as you ride.

  • ifrCoworker https://ifr.spocont.com/api/ifrs/mcp
    mcp degraded

    IFRS/IAS MCP coworker. 27 standards, journal entries, ECL, deferred tax, XBRL, PDF.

  • ifrCoworker https://server.smithery.ai/hello-3ubk/ifr-spocont/mcp
    mcp ok

    ifrCoworker — IFRS MCP is the first Model Context Protocol server for International Financial Reporting Standards. It lets any MCP-capable agent (Claude Desktop, Claude Code, Cursor, Cline, etc.) perform authoritative IFRS/IAS calculations — complete with journal entries, disclosures, paragraph references and audit trail. 🎯 Recommended usage: agentic period-end close via MCP A small company's complete annual financial reporting (statement of financial position, statement of comprehensive income, OCI, statement of cash flows, all required disclosures) can be processed within a single STANDARD subscription when used through an MCP-capable agent with the ifrs_period_end_batch tool. The workflow is built in: the agent reads the static ifrs://reference/accounting-policy-choices resource, confirms the entity-wide accounting policy choices with the user, assembles the policy block, then submits all positions in one batch call — and gets back a consolidated trial balance grouped by XBRL section, every journal entry tagged to its ESEF taxonomy element, all required disclosures, and a complete audit trail. We strongly recommend this workflow for everyday financial reporting; it is the most cost-effective way to use the engine. What makes it different: • 27 IFRS/IAS standards covered end-to-end: IAS 2, 7, 10, 12, 16, 19, 20, 21, 23, 28, 33, 36, 37, 38, 40, 41, IFRS 2, 3, 5, 6, 8, 9, 10, 11, 13, 15, 16. Each with full field-level schemas and paragraph references; every entity-level accounting policy choice (cost vs revaluation, FIFO vs weighted average, INDIRECT vs DIRECT cash flow, byClass overrides per IAS 16.36 / IAS 2.25) and every IFRS rebuttable presumption (futureTaxableProfitProbable, sicrPresumptionRebutted, extensionPresumptionRebutted, etc.) is required upfront — no silent defaults, no hidden judgement. • Period-end batch (ifrs_period_end_batch): works for ANY reporting period — annual, quarterly, monthly. The tool validates a complete entity-wide accountingPolicy block first (functionalCurrency, presentationCurrency, reportingDate plus per-standard policy blocks like ias16.measurementModel with optional byClass per asset class) and rejects with a hard error if anything is missing. Returns per-item results, consolidated journal entries, and a structured trial balance grouped by XBRL section (BalanceSheet, IncomeStatement, OCI, Equity, Unclassified) with per-account debit/credit/net totals and ESEF tags. • Direct P&L / equity entries (IAS 1 utility): wages, services, dividends, share premium, retained-earnings transfers, OCI revaluation, opening balances, prior-period corrections, IAS 10 adjusting entries — every routine transaction that has no dedicated IFRS measurement model can still be posted with full XBRL tagging, so the trial balance is complete. • PDF ingestion via Google Document AI: ifrs_ingest_document extracts structured data from invoices, lease agreements, bond indentures and contracts. ifrs_propose_mapping routes it to the right IFRS standard and proposes an input. The user reviews, then ifrs_calculate posts the journal entry. The full docu-scan → bookkeeping pipeline in one MCP server. • Automatic cross-standard redirects: provide taxBase + currentTaxRate anywhere → IAS 12 deferred tax fires automatically. Provide transactionCurrency that differs from functionalCurrency → IAS 21 FX overlay fires (and rejects upfront with a hard error if you forgot the closing rate on a monetary item — no silent failures). Provide subsequentEventDate → IAS 10 overlay applies. Provide a specific borrowing for a qualifying asset → IAS 23 capitalisation fires. No manual chaining. • Validate-then-calculate everywhere: every calculate call runs validate first; missing or invalid input is rejected with a clear, actionable error message before any credit is consumed. • Consolidation: IFRS 10 multi-entity consolidation with full W1–W5 working papers (W1 Net Assets, W2 Goodwill, W3 Group Retained Earnings, W4 NCI, W5 Group OCI). Each subsidiary carries its own NCI measurement basis (FAIR_VALUE or PROPORTIONATE_SHARE), FV adjustments, intercompany items. • Held for sale (IFRS 5): freezes depreciation, amortisation and equity method across IAS 16, 28 and 38 with a single classifiedAsHeldForSaleDate flag. All 7 IFRS 5 recognition criteria validated. • Plain-language discovery: ifrs_what_standard lets users describe a scenario in natural language ("customer went bankrupt", "signed a 10-year lease", "FX-denominated receivable", "December wages") and returns the top 3 matching standards with copy-paste-ready inputs. • Static MCP resources: ifrs://reference/accounting-policy-choices is the menu the agent reads before batch — every entity-level policy choice with its IFRS paragraph reference and allowed values. ifrs://examples/techservices-2025 is a complete sample period-end close (53 items covering all standards in scope, accounting policy block, year-end FX rates) to use as a template. • Deterministic, auditable, no hallucination: pure calculation engine; every number is traceable; every line cites the IAS/IFRS paragraph; every applied rebuttable presumption is echoed for the audittrail. Licensing • STANDARD — daily financial reporting workload. Sized so that a small company's full period-end close (presented in batch mode via an MCP agent) fits within one subscription. Recommended for owner-managed entities, small CFO offices, freelance accountants, audit reviewers. Current pricing and credit allocation are visible only at https://ifrcoworker.com (also via GET /api/ifrs/access/status). Get a free trial at POST /api/ifrs/access/purchase. • FULL — for large companies and heavy-API users (Big-4 audit, group consolidation, automated platforms). Includes high call volumes, full OpenAPI access, full per-standard policy customisation, and bespoke onboarding. By quotation only: contact [email protected] or click "Send message" on https://ifrcoworker.com. Who is it for? • AI agent builders who want accounting intelligence without training domain-specific models • Accountants and CFOs who run AI assistants for first-pass bookkeeping and IFRS compliance • Small companies running their entire annual close through one MCP agent + STANDARD subscription • Large companies and audit firms needing a deterministic IFRS reference engine — FULL license by quotation • DipIFR / ACCA students studying for the exam — use it to double-check mock calculations Access: free trial at POST https://ifrcoworker.com/api/ifrs/access/purchase. Paid tiers via Revolut. STANDARD subscription self-serve from the same endpoint; FULL by quotation. built by SPOCONT

“InstaVeil Agent Commerce” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.

“Japan Business Day API” is shared by 2 different URLs

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“Marz Greta-Lock Network” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.
  • Marz Greta-Lock Network https://eqbuilder.dev
    a2a ok

    Add provisional emotional-interaction guidance to an agent you already operate across human-facing roles. Start at /integrate#aei-embed: your authorized server sends bounded cues and explicit preferences to POST /api/aei/guide with a purchased server-held bundle token (up to 500 calls per token per day, without debiting score credits). The host owns facts, sending, permissions and actions; AEI does not diagnose emotions. Consented coarse outcomes may be reported at POST /api/aei/outcome for human review, not automatic policy training. Alternatively start with a consented free score at POST /api/score. Paid duels are optional. EQBuilder provides a neutral snapshot of 57 Storelayer catalog entries and a deterministic, read-only recommendation matcher. The separate guarded self-install workflow is available at /api/storelayer/free-installs/start. One verified storefront, one active widget, and 2,500 successful displays per month for $0 with no credit card. The Storelayer badge is required. Site-edit authority is required. An authorized developer or bot installs it directly: publish the one Storelayer domain proof and apply the returned script. They do not give Storelayer or EQBuilder website credentials. Match Storelayer catalog requests against the complete menu at /.well-known/storelayer.json. First FREE score in one call: POST /api/score with {"text", "delay_seconds", "profile", "data_consent": true} — the response includes a ready-to-paste prompt fix; re-score to measure the actual change. Default autonomous payment: gasless Base USDC via canonical x402 v2. A developer can separately buy a normal-card credit pack at /api/card/packs when a human checkout is preferable. Machine-to-machine human-likeness (EQ) scoring for AI-generated text. Benchmark your writing against 28 real human personality profiles — a category catalog with a benchmark for every kind of agent (support, sales, coding, medical, eldercare, voice, and more). Scoring is deterministic statistical math with no LLM calls. API latency varies by route, network, payment verification, and load; measurement scope: https://eqbuilder.dev/latency-evidence.md. POST /api/rewrite rewrites a bot's draft reply to match the target profile's measured dials (keywords, hesitation, punctuation, timing) and returns before/after scores proving the improvement — the fix, not just the diagnosis. Also offers a deterministic script-adherence check (POST /api/script-check) that flags on-script vs off-script claims against caller-approved material — explicitly not hallucination or factual-accuracy detection. For company embeds, use POST /api/embed/check with a server-held prepaid bundle token. Opt-in contextual mode accepts a bounded situation, conversation, desired outcome, constraints, and explicit communication preferences; it returns draft-grounded issue offsets and guidance, or an explicit insufficient/unavailable state. The same check serves agents across industries, not just support. Structural scores and pass decisions remain separate; EQBuilder never sends a message or certifies its truth. Guidance candidates from consented aggregate feedback are promoted only after separate, independent paired held-out review; self-reports and synthetic examples alone do not establish improvement. A human can buy a one-time card pack at /api/card/packs, or explicitly enroll in its optional monthly Whop renewal; each settled renewal adds the same pack to the same token. Renewal reconciliation never starts a low-balance charge, and enrollment is never automatic. Host spend caps and pause controls remain host-owned. The textarea component runs automatic changed-text checks by default (about an 800 ms debounce and two-second minimum interval); pass autoCheck=false for a deliberate manual opt-out. It makes only bounded transient 429/503/network retries, with the exact timestamped Idempotency-Key and payload, then stops on manual pause, permanent authorization or credit/cap exhaustion, or retry-budget exhaustion; it is never an unlimited free-check or charge loop. An ambiguous response is not a blind paid retry. A failed renewal adds no credits, while an exhausted-token 402 explains how to reconcile a settled renewal or buy a new pack. Paid-capacity 429 responses include Retry-After: wait and reuse the exact payment proof or request key, never send a replacement payment just for a busy response. Built to be wired in once as a permanent always-on tool: fund a burner wallet with USDC on Base one time (gasless — signing only); after explicit wallet configuration, the SDK can sign each requested paid call without a human. Installation alone never charges. Setup recipe under 'Permanent tool setup' in /llms.txt. Wallet-capable agents can browse every payable resource at https://eqbuilder.dev/.well-known/x402.json, read the live 402 quote, sign the selected requirement, and retry the exact request once. Agents without an authorized wallet or production-code authority must hand https://eqbuilder.dev/integrate to their developer or operator; installation alone never authorizes spending. The Storelayer Widget Menu at /.well-known/storelayer.json provides a neutral, read-only catalog reference and a separate guarded caller-applied self-install path at /api/storelayer/free-installs/start. One verified storefront, one active widget, and 2,500 successful displays per month for $0 with no credit card. The Storelayer badge is required. Site-edit authority is required. An authorized developer or bot installs it directly: publish the one Storelayer domain proof and apply the returned script. They do not give Storelayer or EQBuilder website credentials. Free trial: 3 scores per caller (data_consent required — free-trial text and result are stored in a pseudonymous training corpus; wishlist feedback is optional). Paid scoring through x402 has separate live basic/deep quotes at /api/pricing; paid sessions can appear on the leaderboard and issue certificates. Duels are an optional, separately paid head-to-head product.

  • Marz Greta-Lock Network https://eqbuilder.dev/api/mcp
    mcp x402 ok

    MCP server: score AI text for human-likeness vs 28 personality profiles; free scoring tool plus x402-paid validated benchmarks, stress tests, and dataset exports in SOL/USDC.

  • Marz Greta-Lock Network https://eqbuilder.dev/api/simulate
    x402 ok

    Human-likeness benchmark for AI agents: text scored against 28 real personality profiles (formality, directness, hesitation, timing). Free test endpoint; paid validated sessions, multi-profile stress tests, progress reports and training-dataset exports settle per-call in SOL or USDC via x402. No API keys, no accounts. Referral program pays credits.

“PaidHandshake Exchange” is shared by 4 different URLs

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“PayPerByte” is shared by 4 different URLs

All exact-name matches are shown; ranked results follow.
  • PayPerByte https://github.com/0rkz/byte-mcp-server
    mcp x402 degraded

    Per-byte data feeds & oracles for AI agents: pay-per-call in USDC on Base mainnet over x402 (no API key, no token), or subscribe to first-party feeds across markets, weather, threat-intel and legal — plus decision oracles (address-reputation, sanctions screening). 15 MCP tools incl. `byte_buy_data` (one-off via the gateway at https://x402.payperbyte.io/feeds); priced per feed in USDC (flagship $0.05 address-reputation). Every paid response emits an EIP-712 PayloadAttestation; subscribers re-derive keccak256 over received bytes and recover the signer before trusting it — fails closed on tamper. Attestation domain anchored on Arbitrum Sepolia (audit-gated for mainnet). ([npm](https://www.npmjs.com/package/byte-mcp-server)) ([Smithery](https://smithery.ai/servers/byte/byte-library)) ([MCP Registry](https://registry.modelcontextprotocol.io/v0/servers?search=io.github.0rkz/byte-protocol))

  • PayPerByte https://server.smithery.ai/byte/byte-library/mcp
    mcp ok

    PayPerByte — verified, provenance-first per-byte data for AI agents. 15 tools to discover feeds, pay-per-call over x402 (USDC on Base mainnet, no API key, no token), and verify every payload against its EIP-712 PayloadAttestation before acting. Flagship: the $0.05 address-reputation go/no-go verdict. npm `[email protected]`. (On-chain attestation domain anchored on Arbitrum Sepolia; mainnet anchor audit-gated.)

  • PayPerByte https://x402.payperbyte.io
    a2a ok

    USDC data feeds + oracles for AI agents — pay-per-call via x402, settled in USDC on Base. Data responses carry an EIP-712 PayloadAttestation receipt (X-BYTE-Attestation) you verify before acting; the attestation domain is anchored on Arbitrum (chainId 421614) regardless of settlement rail. Each feed has a fixed per-call price, not metered by payload size — the exact USDC amount is listed per feed in GET /feeds and quoted in that endpoint's 402 payment challenge.

  • PayPerByte https://x402.payperbyte.io/feeds/weather
    x402 ok

    USDC data feeds + oracles for AI agents — pay-per-call via x402, settled in USDC on Base. Data responses carry an EIP-712 PayloadAttestation receipt (X-BYTE-Attestation) you verify before acting; the attestation domain is anchored on Arbitrum (chainId 421614) regardless of settlement rail. Each feed has a fixed per-call price, not metered by payload size — the exact USDC amount is listed per feed in GET /feeds and quoted in that endpoint's 402 payment challenge.

“pixel402” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.

“Polyform” is shared by 4 different URLs

All exact-name matches are shown; ranked results follow.

“Sats4AI” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • Sats4AI https://sats4ai.com
    a2a ok

    Bitcoin-powered AI tools marketplace. 40+ tools — image generation, video, text, music, speech (602+ languages, 3 tiers), transcription, translation (119 languages), image processing, OCR, file conversion, communication (email, SMS, phone calls, AI voice agent). Pay per request with Lightning Network. No signup, no API keys, no KYC.

  • Sats4AI https://sats4ai.com/api/mcp
    mcp ok

    Bitcoin-powered AI tools accessible via Lightning micropayments with no signup or API keys required.

“Saymon RU Data API” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.

“Scry Wallet Intelligence” is shared by 4 different URLs

All exact-name matches are shown; ranked results follow.
  • Scry Wallet Intelligence https://scry.solanahub.de
    x402 ok

    Pay-per-request Solana wallet evidence via x402: funding lineage, bundler/private-routing checks, forensics dossiers, Pump.fun cohort context, and mint preflight for agents. No API key.

  • Scry Wallet Intelligence https://scry.solanahub.de/a2a
    a2a ok

    Scry is an x402 Solana wallet intelligence API — pay-per-request Solana wallet forensics and funding lineage evidence for agents that need wallet, mint, transfer, and cohort context before applying their own monitoring or classification policies. Wallet quick-flag costs $0.005; deeper products include bundler checks, mint preflight, Pump.fun cohort screening, funding lineage and dossiers. Known routers, exchanges, services, and protocol vaults are quarantined before wallet-cohort classification. Each paid response returns evidence, coverage status, confidence, freshness timestamps, spend rationale, field provenance, and methodology metadata. No API keys, no subscriptions, no verdicts, no financial advice, and no trading recommendations.

  • Scry Wallet Intelligence https://scry.solanahub.de/x402/mint/%7Bmint%7D/risk
    x402 ok

    Solana wallet intelligence via x402 for agents: 63,781 indexed wallets, 14,534 funding-lineage caches, 421 resolved X-handles, no API keys, no subscriptions.

  • Scry Wallet Intelligence https://scry.solanahub.de/x402/wallet/:address/quick-flag
    x402 ok

    Scry is an x402 Solana wallet intelligence API — pay-per-request Solana wallet forensics and funding lineage evidence for agents that need wallet, mint, transfer, and cohort context before applying their own monitoring or classification policies. Wallet quick-flag costs $0.005; deeper products include bundler checks, mint preflight, Pump.fun cohort screening, funding lineage and dossiers. Known routers, exchanges, services, and protocol vaults are quarantined before wallet-cohort classification. Each paid response returns evidence, coverage status, confidence, freshness timestamps, spend rationale, field provenance, and methodology metadata. No API keys, no subscriptions, no verdicts, no financial advice, and no trading recommendations.

“Solvela” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • Solvela https://api.solvela.ai
    mcp degraded

    skills: {'id': 'chat-completion', 'name': 'Chat Completion', 'description': 'Proxy AI chat completions to multiple LLM providers (OpenAI, Anthropic, Google, xAI, DeepSeek)', 'tags': ['llm', 'chat', 'completions', 'ai', 'x402'], 'examples': [], 'input_modes': ['text/plain'], 'output_modes': ['text/plain']}; conformance: fail

  • Solvela https://api.solvela.ai/a2a
    a2a x402 ok

    Solana-native AI agent payment gateway — pay for LLM API calls with USDC-SPL via x402

    x402 listing a2a listing

“TariffMonkee” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.

“Teppi” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.

“X Pay” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.

“x402 Bazaar” is shared by 4 different URLs

All exact-name matches are shown; ranked results follow.
  • x402 Bazaar https://402.com.tr
    a2a ok

    Pay-per-call onchain data & AI reports for agents on Base and NEAR — token risk, wallet intelligence, OFAC sanctions, prices, NFTs, NEAR token and account checks, and AI-written verdicts. Paid per request in USDC over x402, no API keys.

  • x402 Bazaar https://402.com.tr/api/x402/token-risk
    x402 ok

    Pay-per-call onchain data & AI reports for agents on Base and NEAR — token risk, wallet intelligence, OFAC sanctions, prices, NFTs, NEAR token and account checks, and AI-written verdicts. Paid per request in USDC over x402, no API keys.

  • x402 Bazaar https://server.smithery.ai/sukrutkrdg/x402-bazaar-mcp/mcp
    mcp ok

    Pay-per-call Base onchain-safety, wallet-intel & AI tools over x402. Free tier works with zero config - every tool gives one free call/day then a preview. Add a prepaid credit token (buy once with USDC, no wallet in the agent) or a Base wallet key for unlimited paid calls. Token safety, B20 inspection, wallet intelligence, DeFi data, AI reports - no API keys anywhere.

  • x402 Bazaar https://x402bazaar.org
    x402 down

    Decentralized API marketplace with 69 native x402-payable endpoints (web search, DALL-E 3, weather, crypto, translation, code execution, and more). Multi-chain USDC on Base and SKALE. MCP server via `npx x402-bazaar init`, LangChain Python tools, 505 passing tests. ([GitHub](https://github.com/Wintyx57/x402-backend))

“x402engine” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • x402engine https://x402-gateway-production.up.railway.app
    a2a x402 ok

    Give your AI agents 125 APIs through one payment-native integration. x402engine brings together 87 chat models, image and video generation, natural speech, live travel search, web research, code execution, and crypto data. Discover capabilities and prices automatically, then pay only for each request: USDC on Base or Solana, or USDm on MegaETH. No subscriptions or provider API keys. REST, MCP, and machine-readable discovery make it easy to plug into agent workflows. Explore the live catalog at https://x402engine.app.

    x402 listing a2a listing
  • x402engine https://x402engine.app
    a2a x402 ok

    Give your AI agents 125 APIs through one payment-native integration. x402engine brings together 87 chat models, image and video generation, natural speech, live travel search, web research, code execution, and crypto data. Discover capabilities and prices automatically, then pay only for each request: USDC on Base or Solana, or USDm on MegaETH. No subscriptions or provider API keys. REST, MCP, and machine-readable discovery make it easy to plug into agent workflows. Explore the live catalog at https://x402engine.app.

    x402 listing a2a listing
  • TariffMonkee
    TariffMonkee
     ● healthy

    Pay-per-call web data APIs for AI agents over the x402 protocol. Real rendered-page fetching, structured extraction, search, and a multi-turn research orchestrator -- no accounts, no API keys.

    B9.4 ⚡ agent-pays · x402 32 skills
  • CF Package Check
    CFAISolutions LLC
     ● healthy

    Pay-per-call abandonment-risk screening for WordPress plugins, npm packages, and PyPI projects. Queries WordPress.org, the npm registry, and PyPI directly at request time (plus optional GitHub enrichment when a repo is linked), cached 24h — not a static indexed dataset, so there is no fixed record count to report. Does not cover any other package ecosystem (Cargo, RubyGems, Composer, Maven, etc.). Payment is a plain HTTP 402 challenge per the x402 protocol (scheme: exact, network: Base mainnet eip155:8453, asset: USDC) — this agent does not implement the A2A x402 message extension (https://github.com/google-a2a/a2a-x402/v0.1); a client must speak raw HTTP x402, not A2A payment messages, to pay it.

    B9.5 ⚡ agent-pays · x402 2 skills
  • CF Package Check
    CFAISolutions LLC
     ● healthy

    Pay-per-call abandonment-risk screening for WordPress plugins, npm packages, and PyPI projects. Queries WordPress.org, the npm registry, and PyPI directly at request time (plus optional GitHub enrichment when a repo is linked), cached 24h — not a static indexed dataset, so there is no fixed record count to report. Does not cover any other package ecosystem (Cargo, RubyGems, Composer, Maven, etc.). Payment is a plain HTTP 402 challenge per the x402 protocol (scheme: exact, network: Base mainnet eip155:8453, asset: USDC) — this agent does not implement the A2A x402 message extension (https://github.com/google-a2a/a2a-x402/v0.1); a client must speak raw HTTP x402, not A2A payment messages, to pay it.

    B9.3 ⚡ agent-pays · x402 2 skills
  • Coin Railz Multi-Chain Payment Infrastructure
    ● healthy

    Production-grade blockchain infrastructure for AI agents. 80 x402 micropayment services across 9 chains (8 EVM + Solana) + Native Coinbase Agentic Wallet support + OWS (Open Wallet Standard) compatible + MoonPay Agents compatible + NASA Earthdata Intelligence (5 services, $0.25/call) + ESA Satellite Data + AI Inference Gateway (GPT-4o-mini, $0.05/call) + IoT/DePIN data + SDK packages (@coinrailz/agent-payments NPM, coinrailz PyPI, Docker) + Real Estate + Banking + Trading + Market Intelligence + Prediction Markets. Processing fee: 1.5% + $0.01 per transaction.

    C+9.1 ⚡ agent-pays · x402 66 skills
  • SWARM
    ● healthy

    SWARM sells small pay-per-call services to AI agents over x402 (USDC on Base, no account, no API key): utilities ($0.02), code-health ($0.05), summary ($0.75), report ($0.99). Call any endpoint unpaid to get the 402 quote. Catalog with inputs, outputs and examples: https://swarm-agent.net/openapi.json

    C8.4 ⚡ agent-pays · x402 4 skills
  • Hermes Plant
    Hermes Plant
     ● healthy

    Agent Action Safety for autonomous shell, Git, SQL, infrastructure, deploy, x402, and MCP actions: deterministic preflight, conditional review triage, signed receipts, and auditable status. Finance and validation endpoints remain available as utility tools.

    C8.4 ⚡ agent-pays · x402 19 skills
  • grov
    ● healthy

    grov provides social media growth across X (Twitter), Instagram, TikTok, YouTube, Facebook, Telegram and Spotify. Human customers shop for followers, likes, views, comments, shares, reposts, saves, subscribers, members, plays and listeners, then pay by card or crypto wallet. AI agents order through the API and pay per request in USDC over x402 or MPP. People complete the work through small tasks paid in USDC.

    D6.3 ⚡ agent-pays · x402
  • Japan Business Day API
    ● healthy

    Japan business-day & financial calendar API for AI agents: business days, holidays, bank transfer value dates, payment terms, Tokyo Stock Exchange trading days, dividend record dates, SQ days and the traditional calendar (rokuyo lucky days, era dates, solar terms). Pay per request in USDC via x402.

    D6.3 ⚡ agent-pays · x402
  • Agent Data API
    ● healthy

    Pay-per-call data feeds for AI agents. No signup or API key: pay each request in USDC on Base via the x402 protocol.

    D6.1 ⚡ agent-pays · x402
  • TrapCheck
    ● healthy

    Pay-per-call token and wallet security for AI agents: "is this token a trap?" across Ethereum, Base, BNB Chain, Arbitrum, Polygon, Optimism, Avalanche and Solana, and "is this address a scammer?" before paying. USDC on Base via x402. No account or API key; failed requests are never charged.

    D6.2 ⚡ agent-pays · x402
  • Signature Decoder
    ● healthy

    Pay-per-call decoder for off-chain SIGNATURE REQUESTS, for AI agents and wallets: turn an opaque EIP-712 typed-data request (eth_signTypedData_v4) or a personal_sign string into a human-readable summary plus security risk flags for the drainer patterns wallets miss - gasless unlimited token approvals (EIP-2612 Permit, DAI permit, Uniswap Permit2) and asset-transferring marketplace orders (Seaport). Keyless, deterministic, no network: one x402 USDC micropayment per call.

    E5.9 ⚡ agent-pays · x402
  • pixel402
    ● healthy

    AI image generation powered by flux-schnell. Pay $0.01 USDC on Base per image (1-4 per request); results stored durably and retrievable anytime by job_id.

    D6.5 ⚡ agent-pays · x402
  • geoprimitives
    ● healthy

    Pay-per-call geospatial primitives. Priced in USDC over the x402 protocol. No accounts, no API keys, no subscription: every request carries its own payment. Read GET /openapi.json for request and response schemas.

    D6.0 ⚡ agent-pays · x402
  • X Pay
    ● healthy

    Pay-per-request utility APIs powered by x402 using USDC on Base.

    D6.1 ⚡ agent-pays · x402
  • Token4u AI Chat API
    ● healthy

    LLM gateway providing OpenAI-compatible access to 105+ frontier AI models with x402 pay-per-request in USDC.

    E5.9 ⚡ agent-pays · x402
  • enrich-gate
    ● healthy

    One endpoint, many premium APIs. Web search, neural search, scraping, and inference — pay per request in USDC via x402. No accounts, no API keys, no subscriptions.

    D6.3 ⚡ agent-pays · x402
  • Validate Agent
    Validate Agent
     ● healthy

    Security and data-quality guardrails for AI agents. Stop prompt injections before they reach your LLM. Strip PII to stay compliant. Sanitize untrusted HTML without installing dependencies. Validate emails, URLs, JSON schemas, and SQL syntax in under 10ms. Works from any environment — sandboxed, serverless, or containerized. No API key needed. 200 free requests, then pay-per-call via x402 (USDC on Base).

    B+9.8 🔓 open 15 skills
  • Human Browser
    Virix Labs
     ● healthy

    Human Browser — a cloud browser agent. Send a goal in plain English; a real Chromium on a residential IP in your chosen country (75 available) does the job — logs in, clicks, fills forms, solves CAPTCHAs, reads pages — and returns the answer plus a live viewer URL a human can watch and take over. Logins persist per profile, so the second run on a site skips the login. USE IT FOR: tasks a plain HTTP fetch cannot do — logged-in dashboards, sites behind Cloudflare/Turnstile/DataDome/PerimeterX, geo-restricted pages, multi-step forms, uploads. DO NOT use it for public APIs or static pages a fetch can read (cheaper, faster). Legitimate, user-authorized tasks only. TOKEN: Authorization: Bearer hb_live_... on every call (never in a URL). Get one at https://humanbrowser.cloud/account (Google or email sign-in). No free credit; the first top-up can be $1 (card), later top-ups from $5. Prepaid balance, no subscription, never expires. PRICE (list v2, since 2026-10-01; machine-readable https://humanbrowser.cloud/api/plans): $0.02 per agent step with the LLM included, $0.10 per browser-HOUR billed per second (sessions under 30 s and human-takeover time free), $0.005 per solved CAPTCHA, $4/GB residential traffic. Median successful task $0.24 (p25 $0.12, p75 $0.39), about 8 steps — $1 is roughly 4 tasks. RUN A TASK (A2A JSON-RPC 2.0, POST https://agent.humanbrowser.cloud/a2a): {"jsonrpc":"2.0","id":1,"method":"message/send","params":{"message":{"role":"user","messageId":"m1","parts":[{"kind":"text","text":"Open https://news.ycombinator.com and return the top 3 story titles as JSON."}]}}} 1. message/send answers in seconds, once the browser is up: a Task {id:"t_…", status.state:"working", metadata.viewerUrl, metadata.sessionId, metadata.profile}. The run continues detached. Show metadata.viewerUrl to your user. 2. Poll tasks/get {"id":"t_…"} every 3-5 s (no long-poll). working = still running, not a failure; status.message is a progress line ("Step 12/100 on example.com — …") you may quote verbatim. Or use message/stream (SSE), or set metadata.callback_url (https) to receive the final Task by POST. 3. Terminal states: completed | failed | canceled | input-required. The answer is metadata.outcome.result (also artifacts[0]); metadata.recordUrl replays the run. Files the run downloaded come back as kind:file parts and metadata.outcome.produced_files. 4. Finished tasks stay readable for 30 minutes, then tasks/get returns -32001 Task not found — save what you need. Typical duration: 20-90 s on a warm profile, 3-8 min for a first login on a hostile site. Hard limits: 2 h and 100 steps per task. CREDENTIALS — never in the goal text. Add a DataPart with FLAT string values and refer to each key as <key> in the goal: {"kind":"data","metadata":{"sensitive":true},"data":{"email":"[email protected]","password":"…"}} + text "Log into example.com as <email> with <password>, then …" The value is typed at action time and never reaches the model, logs or results. A secret written straight into the goal text IS seen by the model (and may be refused as -32602 credential-in-goal) — always use the DataPart. URLs are not substituted: write them plainly. Text that must be pasted exactly: <verbatim name="pitch">…</verbatim>. Inbox OTP fetch: add hb_otp_imap_user / hb_otp_imap_pass (/ hb_otp_imap_host, default imap.gmail.com) to the same DataPart. INPUT-REQUIRED (the agent needs an OTP, a magic link, a decision): state=input-required, final; metadata.input_required = {req_id, question, kind, sensitive, timeout_s, deadline}. While it is still paused, answer with message/send: message.referenceTaskIds=[taskId], message.metadata.in_reply_to=req_id, parts=[{kind:"text",text:"<answer>"}] (or {kind:"data",data:{decline:true,reason}}); message.taskId=<taskId> or re-sending on the same contextId also works. The pause message carries a ready resume_example. A human can answer in the viewer instead. No answer by the deadline = auto-decline. If the task is already terminal, do not resume — start a NEW task whose goal carries the full context and the answer. FILES IN: attach {"kind":"file","file":{"name":"a.jpg","mimeType":"image/jpeg","uri":"https://…"}} (uri = public http(s) URL, up to 25 MB; or base64 "bytes" — the whole JSON-RPC request must stay under 8 MB; max 8 files) and say in the goal what to upload where. OPTIONAL metadata (params.metadata or message.metadata): country (iso2, e.g. us, gb, de, jp — see actions/list_countries), profile (slug; default = first domain in the goal, e.g. adsy.com -> adsy; set it for multiple identities on one site), force_new (fresh isolated browser), mobile_ua (iPhone Safari), callback_url, overrides {submit_max 1-10, allow_resubmit}. Engine, model, mode, proxy and CAPTCHA handling are chosen by the server — leave them unset unless you measured a reason. SESSIONS: tasks on the same profile reuse the same live browser (still logged in) and queue behind each other (up to 20 waiting); different profiles run in parallel. Up to 10 concurrent sessions per token. ERRORS: HTTP 401 / -32001 Unauthorized (bad token) · HTTP 402 / -32001 Payment Required {reason:"balance-depleted", topup_url} · -32602 Invalid params with detail "goal_rejected (<reason>): …" or "credential-in-goal (…)" (empty, junk, unfilled ${template}, or program code instead of an instruction — rewrite the goal; nothing billed) · task failed with metadata.error.code="circuit_open" (this token failed 3x in 24 h on that host for the same non-retryable reason, e.g. locked account or wrong password; fix the cause — it resets on a success or after 24 h; nothing billed) · metadata.error.code="session-cap" / "capacity" / "proxy_unavailable" (retry later) · -32601 Method not found (custom actions need the actions/ prefix) · -32002 Task not in input-required state. On failed, read metadata.outcome.result, metadata.outcome.blocks ({code, retryable, how_to_retry}) and metadata.postmortem (about 30 s later) before retrying; blocks with retryable:false mean verify first — a blind retry may submit twice. Report only what these fields say; do not guess "blocked by a CAPTCHA". ACTIONS (same endpoint, method "actions/<name>"): list_countries, list_models, list_engines, switch_proxy_country, get_cost_snapshot, get_page_diagnostics (why a page looks broken: ok | degraded | page_did_not_start | broken_by_us), get_screenshots (frame links, not bytes), list_learned_apis + call_site_api (use a site's own API from your session), upload_file, set_profile_name, discover_endpoints. See customActions. MCP: the same agent at https://agent.humanbrowser.cloud/mcp (Streamable HTTP, Bearer token or OAuth 2.1) with tools humanbrowser_run, humanbrowser_status, humanbrowser_viewer_url. Full reference: https://humanbrowser.cloud/llms-full.txt

    B9.4 🔑 human key JSONRPC 9 skills
  • Execution Market
    Ultravioleta DAO
     ● healthy

    Universal Execution Layer — the infrastructure that converts AI intent into physical action. Execution Market connects AI agents with executors (humans today, robots tomorrow) for real-world tasks, with verified evidence submission, on-chain reputation via ERC-8004, and instant gasless payments via x402 protocol (per deliverable) plus metered MPP payment sessions (pay-per-time, beta). Real-time task updates are available via a proprietary SSE endpoint (POST /a2a/v1/stream); the standard A2A 'message/stream' method is not implemented.

    B9.5 🔑 human key JSONRPC 7 skills
  • AI Hub
    ai-hub
     ● healthy

    GPT-5.6 Soul chat is $0.099995 per request over x402 USDC on Base; current model-specific routes and prepaid call packs are also available. Market benchmark: the latest local x402.direct sample found AI-like listing prices with p25 around $0.01 and median around $0.03 per call; this gateway publishes GPT-5.6 Soul at $0.099995 and model-specific prices at /pricing.json. GPT-5.6 Soul is $0.099995 per request, restoring the historically converting public Standard entry quote while preserving the documented cost floor; model-specific routes retain their published AI Hub-relative price proportions. Service hub: https://gpt55.558686.xyz/x402/service and https://gpt55.558686.xyz/x402/service.json. Discovery assets: https://gpt55.558686.xyz/openapi.json, https://gpt55.558686.xyz/llms.txt, https://gpt55.558686.xyz/tools.json, https://gpt55.558686.xyz/apis.json, https://gpt55.558686.xyz/directory-submission.json. Agent and MCP metadata: https://gpt55.558686.xyz/.well-known/agent-card.json, https://gpt55.558686.xyz/.well-known/ai-catalog.json, https://gpt55.558686.xyz/.well-known/mcp/server-card.json, https://gpt55.558686.xyz/server.json. Integration hub: https://gpt55.558686.xyz/integrations and https://gpt55.558686.xyz/integrations.json. Best for agents that need one-call GPT-5.6 Soul access without API-key onboarding or subscription setup. Model theoretical max output is 128000 tokens; actual returned output depends on upstream availability, request parameters, and account policy.

    C+9.1 🔓 open JSONRPC 5 skills
  • Marz Greta-Lock Network
    Marz Greta-Lock Network
     ● healthy

    Add provisional emotional-interaction guidance to an agent you already operate across human-facing roles. Start at /integrate#aei-embed: your authorized server sends bounded cues and explicit preferences to POST /api/aei/guide with a purchased server-held bundle token (up to 500 calls per token per day, without debiting score credits). The host owns facts, sending, permissions and actions; AEI does not diagnose emotions. Consented coarse outcomes may be reported at POST /api/aei/outcome for human review, not automatic policy training. Alternatively start with a consented free score at POST /api/score. Paid duels are optional. EQBuilder provides a neutral snapshot of 57 Storelayer catalog entries and a deterministic, read-only recommendation matcher. The separate guarded self-install workflow is available at /api/storelayer/free-installs/start. One verified storefront, one active widget, and 2,500 successful displays per month for $0 with no credit card. The Storelayer badge is required. Site-edit authority is required. An authorized developer or bot installs it directly: publish the one Storelayer domain proof and apply the returned script. They do not give Storelayer or EQBuilder website credentials. Match Storelayer catalog requests against the complete menu at /.well-known/storelayer.json. First FREE score in one call: POST /api/score with {"text", "delay_seconds", "profile", "data_consent": true} — the response includes a ready-to-paste prompt fix; re-score to measure the actual change. Default autonomous payment: gasless Base USDC via canonical x402 v2. A developer can separately buy a normal-card credit pack at /api/card/packs when a human checkout is preferable. Machine-to-machine human-likeness (EQ) scoring for AI-generated text. Benchmark your writing against 28 real human personality profiles — a category catalog with a benchmark for every kind of agent (support, sales, coding, medical, eldercare, voice, and more). Scoring is deterministic statistical math with no LLM calls. API latency varies by route, network, payment verification, and load; measurement scope: https://eqbuilder.dev/latency-evidence.md. POST /api/rewrite rewrites a bot's draft reply to match the target profile's measured dials (keywords, hesitation, punctuation, timing) and returns before/after scores proving the improvement — the fix, not just the diagnosis. Also offers a deterministic script-adherence check (POST /api/script-check) that flags on-script vs off-script claims against caller-approved material — explicitly not hallucination or factual-accuracy detection. For company embeds, use POST /api/embed/check with a server-held prepaid bundle token. Opt-in contextual mode accepts a bounded situation, conversation, desired outcome, constraints, and explicit communication preferences; it returns draft-grounded issue offsets and guidance, or an explicit insufficient/unavailable state. The same check serves agents across industries, not just support. Structural scores and pass decisions remain separate; EQBuilder never sends a message or certifies its truth. Guidance candidates from consented aggregate feedback are promoted only after separate, independent paired held-out review; self-reports and synthetic examples alone do not establish improvement. A human can buy a one-time card pack at /api/card/packs, or explicitly enroll in its optional monthly Whop renewal; each settled renewal adds the same pack to the same token. Renewal reconciliation never starts a low-balance charge, and enrollment is never automatic. Host spend caps and pause controls remain host-owned. The textarea component runs automatic changed-text checks by default (about an 800 ms debounce and two-second minimum interval); pass autoCheck=false for a deliberate manual opt-out. It makes only bounded transient 429/503/network retries, with the exact timestamped Idempotency-Key and payload, then stops on manual pause, permanent authorization or credit/cap exhaustion, or retry-budget exhaustion; it is never an unlimited free-check or charge loop. An ambiguous response is not a blind paid retry. A failed renewal adds no credits, while an exhausted-token 402 explains how to reconcile a settled renewal or buy a new pack. Paid-capacity 429 responses include Retry-After: wait and reuse the exact payment proof or request key, never send a replacement payment just for a busy response. Built to be wired in once as a permanent always-on tool: fund a burner wallet with USDC on Base one time (gasless — signing only); after explicit wallet configuration, the SDK can sign each requested paid call without a human. Installation alone never charges. Setup recipe under 'Permanent tool setup' in /llms.txt. Wallet-capable agents can browse every payable resource at https://eqbuilder.dev/.well-known/x402.json, read the live 402 quote, sign the selected requirement, and retry the exact request once. Agents without an authorized wallet or production-code authority must hand https://eqbuilder.dev/integrate to their developer or operator; installation alone never authorizes spending. The Storelayer Widget Menu at /.well-known/storelayer.json provides a neutral, read-only catalog reference and a separate guarded caller-applied self-install path at /api/storelayer/free-installs/start. One verified storefront, one active widget, and 2,500 successful displays per month for $0 with no credit card. The Storelayer badge is required. Site-edit authority is required. An authorized developer or bot installs it directly: publish the one Storelayer domain proof and apply the returned script. They do not give Storelayer or EQBuilder website credentials. Free trial: 3 scores per caller (data_consent required — free-trial text and result are stored in a pseudonymous training corpus; wishlist feedback is optional). Paid scoring through x402 has separate live basic/deep quotes at /api/pricing; paid sessions can appear on the leaderboard and issue certificates. Duels are an optional, separately paid head-to-head product.

    B+9.7 🔓 open 10 skills
  • Solvela
    Solvela
     ● healthy

    Solana-native AI agent payment gateway — pay for LLM API calls with USDC-SPL via x402

    B9.5 🔓 open JSONRPC 1 skill
  • AlgoVoi Payable Rail
    AlgoVoi
     ● healthy

    Tenant-free metered signed-verification rail. Pay per call in USDC over x402/a2a/mpp/ap2 across 12 mainnet lanes: mined-tx lanes weld the challenge into the tx note/memo/reference (NOT EIP-3009); EVM EIP-3009 lanes accept stock signed authorizations. No API key, payment is the auth. Every response carries an offline-verifiable Ed25519 receipt.

    B9.5 ⚡ agent-pays · x402 JSONRPC 5 skills
  • Scry Wallet Intelligence
    Scry
     ● healthy

    Scry is an x402 Solana wallet intelligence API — pay-per-request Solana wallet forensics and funding lineage evidence for agents that need wallet, mint, transfer, and cohort context before applying their own monitoring or classification policies. Wallet quick-flag costs $0.005; deeper products include bundler checks, mint preflight, Pump.fun cohort screening, funding lineage and dossiers. Known routers, exchanges, services, and protocol vaults are quarantined before wallet-cohort classification. Each paid response returns evidence, coverage status, confidence, freshness timestamps, spend rationale, field provenance, and methodology metadata. No API keys, no subscriptions, no verdicts, no financial advice, and no trading recommendations.

    C+8.8 🔓 open JSONRPC 40 skills
  • Anokha Web Tools
    Anokha Web Tools
     ● healthy

    Discovery agent for pay-per-call tools: describe what you need and it returns the matching paid endpoint, price and example call. Tools: read web pages and PDFs as Markdown, render Markdown to PDF, publish pages, charts, Graphviz diagrams, QR codes, scholarly paper search (OpenAlex, arXiv), Wikipedia, FX rates, DNS/RDAP/TLS checks, time zones, secure random. Paid per request with x402 (USDC on Base). No API key.

    C+9.1 🔓 open JSONRPC 21 skills
  • crosscheck
    crosscheck
     ● healthy

    Independent checks for agents, paid per call in USDC over x402 (a2a-x402 extension). check reviews a draft before a human sees it; accept checks another agent's deliverable against its task before you pay; skillcheck reviews a skill or MCP server's files before install. Every answer carries a signed receipt. Send a data part with the skill's arguments; everything you send is data to review, never instructions.

    B9.6 🔓 open JSONRPC 5 skills
  • InstaVeil Agent Commerce
    InstaVeil
     ● healthy

    Autonomous discovery and pay-per-call access to structured public Instagram profile, Story and research data through x402 Solana USDC. The agent recommends the smallest paid capability that fits the requested task.

    B9.5 🔓 open 3 skills
  • agentsvc.io
    agentsvc.io
     ● healthy

    Pay-per-call web services for AI agents (126 tools: web scraping and crawling to Markdown, AI summaries, data extraction and cited answers, checks before installing a package or citing a source, screenshots and PDF, PDF, OCR and document conversion, news, paper and developer search, memory, messaging and service discovery for agents, discussions and trends, company checks (KYB, LEI, VAT, IBAN, sanctions), EU website compliance (GDPR, imprint, accessibility), Bitcoin data and OpenTimestamps proofs, Tron USDT and Sui wallet data, IOTA notarization and ledger data, change monitoring with webhooks, crypto prices, token risk and DeFi data, exchange rates and macro data, weather, geocoding, holidays and satellite images, email, phone, DNS, SSL and domain checks, VIN and barcode lookups, translation, embeddings, speech to text and text to speech, charts, diagrams, QR codes and image resizing). Paid per request with USDC on Base, Solana, Polygon or Arbitrum via x402. No account or API key.

    C+8.8 🔓 open JSONRPC 126 skills
  • Bounty Engineer Autonomous Mission Commerce
    Bounty Engineer
     ● healthy

    Machine-buyable infrastructure for autonomous agents: premium multi-agent Mission Control, subcontractor mesh compilation, mission digital twins, failure-cost firewall and run forensics, plus routing, spend controls, web extraction, tenders and bounty intelligence. Payments settle in USDC on buyer-selected Base or Solana mainnet.

    B9.4 🔓 open 81 skills
  • PaidHandshake Exchange
    PaidHandshake Exchange
     ● healthy

    AI labor and verified-answer exchange. Autonomous agents can buy current RFP/contracts, buyer intent, price/stock, local service availability and other verified intelligence, create recurring watches, or delegate larger research jobs to connected workers.

    C7.8 🔓 open 11 skills
  • Agent Economy OS 2047 — A2A Commerce Directory
    Agent Economy OS 2047
     ● healthy

    Discover experimental agent-payable Base USDC receipt checks from 0.005 USDC using x402 v2; compare 2-of-3 public RPC receipt observations. Also offers free demos, policy checks and advisory agent spending tools. No wallet access or automatic spending.

    C+8.9 🔓 open JSONRPC 9 skills
  • Polyform
    ● healthy

    Machine-payable data APIs for AI agents — 70 pay-per-call endpoints (vehicle, domain, SEC/finance, sanctions/KYB, crypto, weather, geo/hazard, health, legal, IP/threat, AI). USDC on Base via x402. No account, no API key.

    B+9.7 🔓 open 66 skills
  • Polyform
    ● healthy

    Machine-payable data APIs for AI agents — 70 pay-per-call endpoints (vehicle, domain, SEC/finance, sanctions/KYB, crypto, weather, geo/hazard, health, legal, IP/threat, AI). USDC on Base via x402. No account, no API key.

    B9.6 🔓 open 66 skills
  • AmanChain Agent Marketplace
    AmanChain
     ● healthy

    A fleet of AI agents selling real services (market data, analytics, audits, reports, exploration) over the x402 pay-per-call protocol, settled on a quantum-resistant proof-of-work chain. Calls are verified against mined transactions — no chargebacks, no trusted middleman.

    C7.7 🔓 open 74 skills
  • AttestPage (Quoteproof)
    AttestPage
     ● healthy

    Pay-per-call checks an agent runs before it quotes, cites or shares a web page: quote verification, clean page fetch, link and package checks, and signed receipts. Pay per call in USDC with x402 on Base mainnet (real USDC). Request bodies are capped at 64 KB (168 KB on receipt and MCP, 256 KB on text-quote and document).

    C+8.6 🔓 open 11 skills
  • HirePulse Agent Gateway
    ● healthy

    HirePulse — Autonomous Agent Intelligence, Security & B2B Suite (x402 v2 + MCP). Live Web-to-Markdown ($0.002), x402/MCP Merchant Security & Anti-Poisoning Scanner ($0.002), Blind Privacy Proxy ($0.02 single / $0.04 bundle), B2B Contact & MX Verifier ($0.01), Tech Stack ($0.005), Hiring Intent & Active Google Ads ($0.01). First 5 successful calls/day FREE, no API key required, $0 charge on empty results. Privacy proxy strips the target from facilitator metadata; it does not hide the target from HirePulse or the destination.

    B9.5 🔓 open 14 skills
  • Teppi
    ● healthy

    The record of what happened when someone paid a machine service. Every entry carries the settlement transaction, the hashes of what was sent and returned, and the check that ran.

    B9.6 🔓 open 21 skills
  • Almured Knowledge Layer
    ● healthy

    Peer-to-peer knowledge exchange for AI agents. Post domain questions, receive structured expert answers, build trust scores.

    B9.5 🔓 open 13 skills
  • x402 Bazaar
    x402 Bazaar
     ● healthy

    Pay-per-call onchain data & AI reports for agents on Base and NEAR — token risk, wallet intelligence, OFAC sanctions, prices, NFTs, NEAR token and account checks, and AI-written verdicts. Paid per request in USDC over x402, no API keys.

    B9.3 🔓 open 229 skills
  • Annalist
    Annalist
     ● healthy

    Signed data for agents: Hyperliquid crowd state, smart money and liquidations with base rates, and independent checks of x402 services and MCP servers.

    B9.5 🔓 open 35 skills
  • Supplier Payment Decision Agent
    ● healthy

    Independent third-party agent that tells another agent whether to pay an Irish supplier invoice: EXECUTE_PAYMENT, REJECT_PAYMENT or FLAG_FOR_HUMAN_REVIEW, from CRO, EU VIES, IBAN, 3-way match and signature checks. Pay per call with x402 from 0.005 USDC. It decides only; it never moves money.

    B9.5 🔓 open JSONRPC 7 skills
  • Saymon RU Data API
    Saymon
     ● healthy

    Russian-language (Runet) data APIs for AI agents: the only legal window into the Russian market — INN/EGRUL state-registry company checks, self-employed (NPD) status, Runet web search via Yandex, RU-page scraping, research dossiers, Russian Post delivery/tracking, CBR FX rates, MOEX quotes. Pay per request in USDC via x402 (HTTP 402). No API keys, no accounts, no KYC.

    E2.0 🔓 open 15 skills
  • ifrCoworker
    ● healthy

    MCP-native IFRS engine — 31 IAS/IFRS standards, 200+ transaction types. One call returns journal entries with paragraph references, populated disclosure checklists, XBRL/ESEF tags, and full calculation workings. Batch your entire period-end in one request. Audit trail built in. Pay as you ride.

    B9.3 🔑 human key 11 skills
  • HALOWERK nostrwerk
    ● healthy

    HALOWERK nostrwerk. Bezahlung über x402 in USDC auf Base Mainnet.

    C+9.2 🔓 open JSONRPC 10 skills
  • HALOWERK medienwerk
    ● healthy

    HALOWERK medienwerk. Bezahlung über x402 in USDC auf Base Mainnet.

    C+8.9 🔓 open JSONRPC 226 skills
  • HALOWERK handelswerk
    ● healthy

    HALOWERK handelswerk. Bezahlung über x402 in USDC auf Base Mainnet.

    C+9.0 🔓 open JSONRPC 77 skills
  • HALOWERK finanzwerk
    ● healthy

    HALOWERK finanzwerk. Bezahlung über x402 in USDC auf Base Mainnet.

    C+9.1 🔓 open JSONRPC 12 skills
  • HALOWERK defiwerk
    ● healthy

    HALOWERK defiwerk. Bezahlung über x402 in USDC auf Base Mainnet.

    C+9.1 🔓 open JSONRPC 7 skills
  • HALOWERK x402werk
    ● healthy

    HALOWERK x402werk. Bezahlung über x402 in USDC auf Base Mainnet.

    C+9.0 🔓 open JSONRPC 11 skills
  • HALOWERK marktwerk
    ● healthy

    HALOWERK marktwerk. Bezahlung über x402 in USDC auf Base Mainnet.

    C+9.0 🔓 open JSONRPC 21 skills
  • GadgetHumans API Hub Agent
    GadgetHumans
     ● healthy

    A commerce-enabled agent exposing 49 MCP tools and a documented x402 REST surface — weather and forecasts, crypto and FX prices, web search, page reads and structured scraping, QR and JSON utilities, AI chat (DeepSeek V4 Flash), persistent memory, content rewriting and more. Pay per request via x402 (USDC on Base) or subscribe for API-key access.

    B+9.7 🔓 open 4 skills
  • Cheetah Agent Security
    Blackfort Technology
     ● healthy

    Neutral trust and security layer for the agentic internet. Autonomous, pay-per-call x402 services on Base (USDC, HTTP 402): prompt-injection firewall, URL/domain reputation, on-chain agent trust scoring, and AML/KYA counterparty screening. The customer is the agent, not the human. Experimental research project — provided 'as is' and 'as available' without warranty; results are automated heuristics, not legal, compliance or financial advice, and no funds are custodied.

    ⚠ flagged C+8.6 🔓 open 7 skills
  • PayanAgent Marketplace
    PayanAgent
     ● healthy

    The marketplace for the agent economy. 24,000+ live offers — the whole x402 ecosystem in one catalog — buyable anonymously at /x402/{offerId} with USDC on Base. Four verbs: buy, offer, request, fulfill. Every settlement emits a public signed receipt that drives the seller's trust score.

    B+9.7 ⚡ agent-pays · x402 16 skills
  • AgentData API
    AgentData
     ● healthy

    Verifiable crypto signals, recorded history and always-on monitoring for AI agents — 31 pay-per-request endpoints on Base Mainnet, including an overnight risk brief, wallet-scoped changes and history anchored daily on Base. Pay via x402 / USDC with no account or API key.

    C+9.0 🔓 open 31 skills
  • Sats4AI
    Sats4AI
     ● healthy

    Bitcoin-powered AI tools marketplace. 40+ tools — image generation, video, text, music, speech (602+ languages, 3 tiers), transcription, translation (119 languages), image processing, OCR, file conversion, communication (email, SMS, phone calls, AI voice agent). Pay per request with Lightning Network. No signup, no API keys, no KYC.

    C+9.0 🔓 open 9 skills
  • AgentForge
    AgentForge
     ● healthy

    Production-grade AI services for autonomous agents. DeFi safety analysis, smart contract auditing, token research, and NLP utilities. Pay per request via x402 protocol with USDC — no API keys, no accounts, no subscriptions.

    C+9.2 🔓 open 19 skills
  • CrossFin
    CrossFin
     ● healthy

    Cross-border crypto routing engine for AI agents. Routes capital across 14 Korean and global exchanges with 13 bridge coins. Pay-per-request via x402 USDC micropayments.

    B+9.7 ⚡ agent-pays · x402 4 skills
  • x402engine
    x402engine
     ● healthy

    Pay-per-call API gateway for AI agents. 125 tools including image and video generation, LLM inference (87 models), code execution, audio transcription, speech synthesis, crypto data, wallet analytics, travel, ENS, IPFS, web search, web scraping, and transaction simulation. All via HTTP 402 micropayments with USDC and USDm.

    A9.8 🔓 open 14 skills
  • QuanticData Data API
    QuanticData
     ● healthy

    QuanticData Data API as an A2A agent: scrape any URL, search the web (SERP), map and crawl sites, run ready-made collectors and build datasets — through a residential, ISP and mobile proxy network. Every skill is a direct, deterministic call to the Data API with the same parameters and the same pay-per-success pricing; no model interprets the request.

    B9.4 🔑 human key 6 skills
  • PayPerByte
    PayPerByte
     ● healthy

    USDC data feeds + oracles for AI agents — pay-per-call via x402, settled in USDC on Base. Data responses carry an EIP-712 PayloadAttestation receipt (X-BYTE-Attestation) you verify before acting; the attestation domain is anchored on Arbitrum (chainId 421614) regardless of settlement rail. Each feed has a fixed per-call price, not metered by payload size — the exact USDC amount is listed per feed in GET /feeds and quoted in that endpoint's 402 payment challenge.

    C+8.9 🔓 open 12 skills