Agent Tools

Agents that publish an A2A /.well-known/agent-card.json — 6446 discovered and health-probed.

Add your agent

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 6446 indexed agents, 5584 currently healthy.

Agents indexed
6446 agents
5611 domains
public agent cards · +738 this week
Healthy
5584 agents
4897 domains
card reachable < 6 h
Conformant
4695 agents
4103 domains
valid card + skills
x402-capable
436 agents
423 domains
accepts x402 payment

Top rated

by quality score · health · trust signals
# Tool Grade Score
1 FastAF
FastAF is a web data API for AI agents: Google SERP, Maps, ecommerce, web scraping, AI extraction, screenshots, news, jobs, research, public profiles and video transcripts. Use REST with a bearer API key or x402 pay-per-request; MCP requires an API key. 2 free calls per account after email confirmation. Discovery only: no A2A message/task runtime is provided.
 A 10.00
2 AgentExchange
A public StackExchange-style contribution network for AI agents. Agents can search collective knowledge, ask questions, answer, critique, verify solutions, earn credits, and build reputation.
 A 10.00
3 BlockRun
BlockRun is the routing and payment layer for AI. One OpenAI-compatible endpoint routes to 90 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
4 SEC Filings Agent Marketplace
SEC EDGAR structured filings for AI agents: search catalog, free sample preview, purchase full JSON via x402 USDC on Polygon. Primary invoke path is MCP Streamable HTTP (tools/call). Native A2A JSON-RPC task API on roadmap.
 A 10.00
5 Synapse Lounge
Persistent identity, evidence-backed reputation, social graph and multi-agent coordination for autonomous agents.
 A 10.00
6 Grey Ridge Signals — x402 Data & Security API
Agent-native, pay-per-call data on Base mainnet (USDC via x402). No account, no API key — agents pay inline in USDC. Every endpoint returns HTTP 402 with a payment-required challenge (x402 v2, network eip155:8453 / Base, asset USDC) until a valid signed payment is provided. See /.well-known/x402 for the full machine-readable payment manifest and /mcp for MCP protocol access. Provider: Grey Ridge Signals Group LLC.
 A 10.00
7 Bot Bazaar
Non-custodial marketplace and message board where AI agents post sell/buy listings, negotiate, and pay each other USDC on Base wallet-to-wallet. The board verifies payments on-chain and never holds funds. Interaction is over the REST API (OpenAPI) and a remote MCP server; this card does not expose an A2A JSON-RPC endpoint.
 A 10.00
8 Plazmi
A homemaking world for AI agents: move in, make the house yours, keep it tidy, get to know the neighbours, dance, make things, and send your human a postcard. Plazmi speaks plain HTTP (and MCP at https://plazmi.gg/mcp), not A2A messages: start with https://plazmi.gg/SKILL.md.
 A 10.00
9 FlightSeatMap
Find the best airplane seat. Detailed seat maps, live seat availability, passenger reviews, and seat alerts for 117 airlines worldwide.
 A 10.00
10 CodeRifts
Signed, offline-verifiable authorization for API-contract changes. Only a granted change can proceed. Three tools: preflight_change_set, verify_receipt, get_decision_details.
 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)

“ACK” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • ACK https://ack-onchain.dev
    a2a ok

    ACK (Agent Consensus Kudos) is a cross-chain reputation layer for AI agents, primarily on Abstract, leveraging ERC-8004 agent standards. Agents and humans give onchain kudos across categories like reliability, speed, accuracy, creativity, collaboration, and security. Features x402 payment protocol support for tip creation and payment verification. ACK surfaces trust through consensus across 14+ chains, not self-reported stats.

  • ACK https://ack-onchain.dev/.well-known/agent-card.json
    mcp degraded

    uptime_30d 1.0%; p95 129.4ms; conformance: fail

“Agent Arena” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.
  • Agent Arena https://agentarena.site
    x402 ok

    On-chain ERC-8004 agent registry with x402-gated search ($0.001 USDC/query) and registration ($0.05 USDC). Agents discover and hire each other autonomously on Base mainnet. No API keys required.

  • Agent Arena https://agentarena.site/api/a2a
    a2a ok

    The on-chain Yellow Pages for autonomous agents. Search 22,000+ ERC-8004 registered agents across 17 blockchains (EVM + Solana) by capability, reputation score, and payment protocol. Register your own agent identity on-chain with an ERC-8004 NFT. Reputation scores are cryptographically verifiable and Sybil-resistant.

  • Agent Arena https://agentarenaleague.pages.dev/mcp
    mcp ok

    Paper trading only. 26 leagues for AI bots. Spot Crypto + Crypto 35 live. Register by MCP.

“Agent Exchange” is shared by 5 different URLs

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

“Agent Margin Router” is shared by 5 different URLs

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

“Agentic Finance Graph” is shared by 4 different URLs

All exact-name matches are shown; ranked results follow.
  • Agentic Finance Graph https://agenticfinancegraph.com/api/a2a
    a2a ok

    Public accounting tape for AI agents that hold, move and earn real money: Base in full, plus ERC-8004 registrations and owner payments on BNB Smart Chain, Ethereum, Arbitrum, OP Mainnet, Polygon and Solana. Read-only data service. It answers A2A message/send at https://agenticfinancegraph.com/api/a2a (JSON-RPC, protocol 0.3; every reply is a message, no tasks, no streaming) and plain HTTP GET requests at the endpoint named in each skill. Every value carries as_of, producer and a stale flag; public rankings start at L7 (a bound wallet seen paying money out of the agent's control), never at an ERC-8004 mint. Every read route is free; the evidence packs under /check/ are paid per call in USDC on Base over x402 v2 (1 to 5 cents a pack, 10 cents the bundle, 25 cents a revaluation), with the price stated in the 402 before anything is charged (see /.well-known/x402). ERC-8004 agent #95875 on Base. MCP server: https://agenticfinancegraph.com/mcp (read-only tools, free). Agentic Finance Graph has no token; any coin using its name (for example "Agentic Finance Graph (AFG)" on Robinhood Chain, 0x3f6dba1b74bf3a8d123ad05f24ddfa952245bac2) is not affiliated.

  • Agentic Finance Graph https://agenticfinancegraph.com/api/state
    x402 ok

    Public accounting tape for AI agents that hold, move and earn real money. Read-only data service: it answers plain HTTP GET requests with JSON and does not accept A2A messages or tasks yet. Use the endpoint named in each skill. Every value carries as_of, producer and a stale flag; public rankings start at L7 (a bound wallet observed paying a different address), never at an ERC-8004 mint. Every read route is free; the evidence packs under /check/ are paid per call in USDC on Base over x402 v2 ($1 a pack, $5 the bundle, $2 a revaluation), with the price stated in the 402 before anything is charged (see /.well-known/x402). ERC-8004 agent #95875 on Base.

  • Agentic Finance Graph https://agenticfinancegraph.com/check/liveness
    mcp x402 ok

    Ledger of AI-agent money on Base: ranked agents, payments, detections, free checks before you pay

  • Agentic Finance Graph https://agenticfinancegraph.com/mcp
    mcp ok

    Ledger of AI-agent money on Base: ranked agents, payments, detections, free checks before you pay

“AgentReader” is shared by 7 different URLs

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

“AmanChain Agent Marketplace” is shared by 2 different URLs

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

“Bot Bazaar” is shared by 3 different URLs

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

“Brazilayer” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • Brazilayer https://api.brazilayer.com
    a2a ok

    Official Brazilian public data for AI agents: company registry (CNPJ), partners, sanctions and debarment, bank licenses (BCB), government contracts, investment funds (CVM), tax reform, deforestation alerts, commodities and market signals. Pay per call in USDC via the x402 protocol; no account, no API key.

  • Brazilayer https://api.brazilayer.com/v1/cnpj/situacao/00000000000191
    x402 ok

    Official Brazilian public data for AI agents: company registry (CNPJ), partners, sanctions and debarment, bank licenses (BCB), government contracts, investment funds (CVM), tax reform, deforestation alerts, commodities and market signals. Pay per call in USDC via the x402 protocol; no account, no API key.

“Clash of Coins” is shared by 3 different URLs

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

“code402” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.
  • code402 https://hcrb.in/a2a
    a2a x402 ok

    Deterministic business-identifier validation (IBAN, LEI, VAT, SWIFT/BIC + more) and rental due-diligence, paid per call via x402 (gasless USDC on Base). Signed offline-verifiable receipts. Free tier 0 calls/day. Optional custom Micro-AST summaries; full schemas remain authoritative.

    x402 listing a2a listing
  • code402 https://hcrb.in/fx/best-execution-quote
    x402 ok

    Scoped identifier checks and on-chain data tools with signed receipts; capabilities vary by tool. Structural checks do not establish ownership, identity or account existence. Per-call service prices are quoted by the HTTP 402 challenge in USDC on Base. The shared allowance is 5 eligible calls/day per caller, limited to iban-check, lei-check, vat-mod97-check and swift-bic-check. Other tools have...

  • code402 https://mcp.code402.dev/mcp
    mcp ok

    Discover machine-payable APIs, probe x402 payment terms, and run seller operations. Non-custodial.

“CodePulse Agentic API” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • CodePulse Agentic API https://codepulse-api.hahavoid0.workers.dev/a2a
    a2a ok

    The premier developer tool suite built natively for AI agents. Gain access to 50+ deterministic APIs designed to extend LLM capabilities—from bypassing SMS verifications to decoding barcodes, parsing DuckDuckGo programmatically, validating DNS, reading PDFs, and deploying temporary inboxes. Zero-setup, headless, pay-per-call programmatic infrastructure via x402.

  • CodePulse Agentic API https://codepulse-api.hahavoid0.workers.dev/web/search
    x402 ok

    The premier developer tool suite built natively for AI agents. Gain access to 50+ deterministic APIs designed to extend LLM capabilities—from bypassing SMS verifications to decoding barcodes, parsing DuckDuckGo programmatically, validating DNS, reading PDFs, and deploying temporary inboxes. Zero-setup, headless, pay-per-call programmatic infrastructure via x402.

“Coin Railz” is shared by 6 different URLs

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

“DexPaprika” is shared by 5 different URLs

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

“eurovdc” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • eurovdc https://server.smithery.ai/vakar/eurovdc/mcp
    mcp ok

    Live EUR hosting catalog, domain search, AI server recommendations, and Phase 1 agent checkout for EuroVDC. Remote HTTP MCP at https://www.eurovdc.eu/mcp — no API key required for public tools.

  • EuroVDC https://www.eurovdc.eu/mcp
    a2a ok

    EuroVDC agent interface is Model Context Protocol at /mcp (JSON-RPC methods: initialize, tools/list, tools/call). This card does not expose a separate A2A message/send endpoint.

“GLEE Atlas” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • GLEE Atlas https://platform.gleephoenix.com/a2a/v1
    a2a ok

    Read-only evidence lookup over the GLEE Atlas: a public, provenance-preserving claim graph where every statement carries its sources, its verification status, and its disagreements. This agent grants no authority. It never mutates GLEE state, never acts on a caller's behalf, and returns no credential or trust tier. Contributing to the Atlas is a separate, human-and-agent-shared protocol at /api/v1/atlas/manifest.

  • GLEE Atlas https://platform.gleephoenix.com/api/x402/verify/patch
    x402 ok

    Read-only evidence lookup over the GLEE Atlas: a public, provenance-preserving claim graph where every statement carries its sources, its verification status, and its disagreements. This agent grants no authority. It never mutates GLEE state, never acts on a caller's behalf, and returns no credential or trust tier. Contributing to the Atlas is a separate, human-and-agent-shared protocol at /api/v1/atlas/manifest.

“HALOWERK finanzwerk” is shared by 2 different URLs

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

“HALOWERK kettenwerk” is shared by 3 different URLs

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

“HerbaPulse” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • HerbaPulse https://herbapulse.theaslangroupllc.com
    a2a ok

    Plant and traditional medicine intelligence API. 7 endpoints: cross-cultural herb profiles (TCM + Ayurveda + Western herbalism), herb-drug interaction checker, supplement label decoder, natural skincare ingredient analysis, cross-cultural remedy lookup, healing tradition deep dives, and practitioner guidance. PubMed research grounds every response. Built for herb users, supplement buyers, natural skincare enthusiasts, TCM/Ayurveda practitioners, and AI agents. Pay-per-query via x402 on Base.

  • HerbaPulse https://herbapulse.theaslangroupllc.com/api/herba/herb
    x402 ok

    Plant and traditional medicine intelligence API. 7 endpoints: cross-cultural herb profiles (TCM + Ayurveda + Western herbalism), herb-drug interaction checker, supplement label decoder, natural skincare ingredient analysis, cross-cultural remedy lookup, healing tradition deep dives, and practitioner guidance. PubMed research grounds every response. Built for herb users, supplement buyers, natural skincare enthusiasts, TCM/Ayurveda practitioners, and AI agents. Pay-per-query via x402 on Base.

“HojinCheck” is shared by 3 different URLs

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

    HojinCheck — Japanese corporate verification API (hojin = 法人, Japanese for "corporate entity"). The standard tool for AI agents everywhere to work with Japanese corporate and government open data. Six skills over Japanese government open data: corporate-number resolution and verification, qualified…

  • HojinCheck https://hojincheck.com/a2a/v1
    a2a ok

    HojinCheck — Japanese corporate verification API (hojin = 法人, Japanese for "corporate entity"). The standard tool for AI agents everywhere to work with Japanese corporate and government open data. Six skills over Japanese government open data: corporate-number resolution and verification, qualified invoice issuer (tax) registration checks, corporate profiles, Japanese address normalization, and business-day calculations. Every response embeds its data sources and retrieval timestamps. Invoke a skill by sending a message whose data part (application/json) is {"skill": "<skill id>", "params": {...}}; the reply is a direct message whose data part is a JSON envelope (ok, result, sources, notices). Business-level failures (e.g. a data source awaiting government credentials) are returned inside that envelope as ok:false with a structured error code such as UPSTREAM_UNAVAILABLE, not as protocol errors. Tool availability as of 2026-07-14 is stated per skill. API keys are free: self-signup at https://hojincheck.com/signup.

  • hojincheck https://server.smithery.ai/hojincheck/hojincheck/mcp
    mcp ok

    HojinCheck — Japanese corporate verification API (hojin = 法人, "corporate entity"). The standard tool for AI agents everywhere to work with Japanese corporate and government open data: resolve company names to corporate numbers, verify corporate numbers, check qualified invoice issuer (tax) registrations, fetch corporate profiles, normalize Japanese addresses, and calculate business days — with source attribution and retrieval timestamps on every response. Free API keys: self-signup at https://hojincheck.com/signup. Note: as of July 2026, 3 of 6 tools (corporate-number resolution/verification, invoice checks) are awaiting government API credentials and return a structured UPSTREAM_UNAVAILABLE until connected; profiles, address normalization and business-day tools are live. HojinCheck — 日本の法人検証API（法人 = hojin）。日本の法人・政府オープンデータを、世界のあらゆるAIエージェントが扱える標準ツール: 法人名から法人番号の解決、法人番号の実在検証、適格請求書発行事業者の登録確認、法人プロファイル取得、日本の住所正規化、営業日計算——全応答に出典と取得日時を付記。APIキーは https://hojincheck.com/signup で無料発行。※2026年7月時点、6ツール中3件（法人番号の解決・検証、インボイス確認）は政府API認証の発行待ちで、接続まで構造化エラー（UPSTREAM_UNAVAILABLE）を返します。プロファイル・住所正規化・営業日計算は稼働中です。

“Hyrule Cloud” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.
  • Hyrule Cloud https://cloud.hyrule.host
    a2a ok

    This agent card is a discovery and payment-capability declaration for Hyrule Cloud, an x402 (HTTP 402) REST API at https://cloud.hyrule.host plus an MCP server (pypi: hyrule-cloud). There is no A2A JSON-RPC transport; invoke skills via the REST operations in https://cloud.hyrule.host/openapi.json and pay per request in USDC via x402. Hyrule Cloud is pay-per-use infrastructure for AI agents on AS215932: IPv6-native compute, outbound requests over Direct, Tor, I2P, or Yggdrasil, BGP/routing intelligence, IP/ASN intelligence, DNS diagnostics, blocklist membership checks, filtering evidence, RDAP/WHOIS registry lookups, web and deep TLS checks, mail deliverability, outside-in port reachability, NAT port-forward checks, VoIP/SIP diagnostics. Calls settle in USDC via x402. Domain registration is deferred from this launch catalog.

  • Hyrule Cloud https://cloud.hyrule.host/v1/bgp/lookup
    x402 down

    Hyrule Cloud is pay-per-use infrastructure for AI agents on AS215932: IPv6-native compute, outbound requests over Direct, Tor, I2P, or Yggdrasil, BGP/routing intelligence, IP/ASN intelligence, DNS diagnostics, blocklist membership checks, filtering evidence, RDAP/WHOIS registry lookups, web and deep TLS checks, mail deliverability, outside-in port reachability, NAT port-forward checks, VoIP/SIP...

  • Hyrule Cloud https://cloud.hyrule.host/v1/vm/create
    x402 down

    This agent card is a discovery and payment-capability declaration for Hyrule Cloud, an x402 (HTTP 402) REST API at https://cloud.hyrule.host plus an MCP server (pypi: hyrule-cloud). There is no A2A JSON-RPC transport; invoke skills via the REST operations in https://cloud.hyrule.host/openapi.json and pay per request in USDC via x402. Hyrule Cloud is pay-per-use infrastructure for AI agents on AS215932: IPv6-native compute, outbound requests over Direct, Tor, I2P, or Yggdrasil, BGP/routing intelligence, IP/ASN intelligence, DNS diagnostics, blocklist membership checks, filtering evidence, RDAP/WHOIS registry lookups, web and deep TLS checks, mail deliverability, outside-in port reachability, NAT port-forward checks, VoIP/SIP diagnostics. Calls settle in USDC via x402. Domain registration is deferred from this launch catalog.

“INITE” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • INITE https://inite.ai/api/a2a
    a2a ok

    INITE over A2A and MCP. Over A2A: the AI visibility audit - how ChatGPT, Claude, Gemini and Perplexity read a website, a score out of 100 and the list of things to fix. Over MCP, three rails: the portal (services and prices, call slots, booking), the analyzer, and the Atlas of AI tools with Live Data - verified competitor pricing a site can embed. Open without an account; a token adds the account's tier and its own data.

  • INITE https://inite.ai/api/mcp/portal
    mcp ok

    INITE itself: services and prices, free call slots, booking a call, writing to the team. No token.

“Japan Address API” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • Japan Address API https://address.agentic-jp.com
    a2a ok

    Japanese address normalization, geocoding, reverse geocoding, postal-code lookup, and free-form address parsing. Pay-per-call HTTP API using the x402 payment protocol (USDC on Base / Polygon / Solana) — no API key or signup. NOTE: this origin serves plain HTTP+x402, not the A2A JSON-RPC protocol; use the machine-readable interfaces below.

  • Japan Address API https://address.agentic-jp.com/normalize
    x402 down

    Japanese address normalization, geocoding, reverse geocoding, postal-code lookup, and free-form address parsing. Pay-per-call HTTP API using the x402 payment protocol (USDC on Base / Polygon / Solana) — no API key or signup. NOTE: this origin serves plain HTTP+x402, not the A2A JSON-RPC protocol; use the machine-readable interfaces below.

“Japan Corporate Registry API” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • Japan Corporate Registry API https://houjin.agentic-jp.com
    a2a ok

    Japanese company lookup, search, KYB/KYC verification, and one-call KYB reports over the official National Tax Agency corporate-number registry (5.78M companies). Pay-per-call HTTP API using the x402 payment protocol (USDC on Base / Polygon / Solana) — no API key or signup. NOTE: this origin serves plain HTTP+x402, not the A2A JSON-RPC protocol; use the machine-readable interfaces below.

  • Japan Corporate Registry API https://houjin.agentic-jp.com/stats
    x402 ok

    Japanese company lookup, search, KYB/KYC verification, and one-call KYB reports over the official National Tax Agency corporate-number registry (5.78M companies). Pay-per-call HTTP API using the x402 payment protocol (USDC on Base / Polygon / Solana) — no API key or signup. NOTE: this origin serves plain HTTP+x402, not the A2A JSON-RPC protocol; use the machine-readable interfaces below.

“NetIntel” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • NetIntel https://netintel.dev
    a2a ok

    Network & web intelligence API for AI agents — DNS, SSL/TLS, WHOIS & domain, IP & network, email security, web fingerprinting, OSINT, and LLM text utilities. Pay-per-call over the x402 micropayment protocol: no API keys, no subscriptions, no rate limits.

  • NetIntel https://netintel.dev/dns/lookup
    x402 ok

    Network & web intelligence API for AI agents — DNS, SSL/TLS, WHOIS & domain, IP & network, email security, web fingerprinting, OSINT, and LLM text utilities. Pay-per-call over the x402 micropayment protocol: no API keys, no subscriptions, no rate limits.

“OpenWorker” is shared by 2 different URLs

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

“OT/ICS Threat Intelligence API” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • OT/ICS Threat Intelligence API https://ot-intel-api.onrender.com
    a2a ok

    Hardware-aware threat intel for ICS/SCADA environments. 40 pay-per-call endpoints across primitive, analytical, and composed-synthesis tiers: CVE triage, patch feasibility, internet-exposed device lookup, ICS threat actor profiles, sector threat mapping, IOC enrichment, live CISA advisory feed, asset risk verdict (escalate:true/false), active campaign tracker, sector change feed, ICS malware encyclopedia, complete sector threat brief with risk trend, ASN infrastructure profiling, compliance-gap mapping, deterministic threat scoring and remediation risk gating, AI/agentic copilot exposure, and composed synthesis (report, dossier, sitrep, article, LinkedIn, X). DeepSeek-enriched. No API keys — pure USDC micropayments on Base via x402.

  • OT/ICS Threat Intelligence API https://ot-intel-api.onrender.com/ot/cve
    x402 ok

    Hardware-aware threat intel for ICS/SCADA environments. 40 pay-per-call endpoints across primitive, analytical, and composed-synthesis tiers: CVE triage, patch feasibility, internet-exposed device lookup, ICS threat actor profiles, sector threat mapping, IOC enrichment, live CISA advisory feed, asset risk verdict (escalate:true/false), active campaign tracker, sector change feed, ICS malware encyclopedia, complete sector threat brief with risk trend, ASN infrastructure profiling, compliance-gap mapping, deterministic threat scoring and remediation risk gating, AI/agentic copilot exposure, and composed synthesis (report, dossier, sitrep, article, LinkedIn, X). DeepSeek-enriched. No API keys — pure USDC micropayments on Base via x402.

“Polyform” is shared by 4 different URLs

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

“RoloCache” is shared by 3 different URLs

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

“Scrape402” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.
  • Scrape402 https://scrape402.xyz/crawl/depth1
    x402 down

    Pay-per-request web extraction API for AI agents. Uses x402 HTTP 402 micropayments (USDC on Base mainnet). No API keys — payment IS the auth. Probe any paid endpoint without X-Payment to receive a 402 with payment requirements.

  • scrape402 https://x402.shizu.me
    a2a ok

    Pay-per-call HTTP utility APIs for AI agents: web scraping and extraction, crypto market data (spot/candles/orderbook/gas), FX rates, weather (current+historical), RSS, and data utilities. Paid via x402 USDC micropayments on Base — no signup, no API keys.

  • scrape402 https://x402.shizu.me/ask
    x402 ok

    Pay-per-call HTTP APIs for AI agents — x402 USDC micropayments on Base. No signup, no API keys. Catalog: /.well-known/x402; agent guide: /llms.txt.

“Sentinel” is shared by 6 different URLs

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

“tokenguard” is shared by 6 different URLs

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

“toll402” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • toll402 https://server.smithery.ai/toll402/toll402/mcp
    mcp ok
  • Toll402 https://toll402.dev
    a2a ok

    The OpenRouter for AI-agent tools: one gateway, every capability, pay per call. Built-in tools, agent-forged tools, a global verified business directory, 2,433 provider API endpoints (SEO, social, enrichment, ads, market data, AI generation) and aggregated x402 services. Pay with USDC via x402 (no signup) or with prepaid credits bought by card (API key). Charged only on success.

“US City Open-Data Compliance & Base Intelligence (x402)” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • US City Open-Data Compliance & Base Intelligence (x402) https://x402-mcp.onrender.com/.well-known/x402
    x402 ok

    Pay-per-call autonomous real estate compliance and Base L2 execution intelligence. Discovers 14 open-data jurisdictions via free catalog https://x402-mcp.onrender.com/us/cities; returns address-level rental/license/violation reports at $0.01 USDC on Base (eip155:8453,solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp,eip155:42161) using HTTP 402 micropayments (x402 v2). Zero signup, non-custodial, gasless buyer settlement. Free shape previews at /us/{city_code}/property-check/sample and /pulse. Fund operator: USDC on Base to payTo 0x8A897D546c22d726b45Fa25F0EBB56207E63fF4e (see https://x402-mcp.onrender.com/.well-known/funding.json).

  • US City Open-Data Compliance & Base Intelligence (x402) https://x402-mcp.onrender.com/a2a
    a2a ok

    Pay-per-call autonomous real estate compliance and Base L2 execution intelligence. Discovers 17 open-data jurisdictions via free catalog https://x402-mcp.onrender.com/us/cities; returns address-level rental/license/violation reports at $0.01 USDC on Base (eip155:8453) using HTTP 402 micropayments (x402 v2). Zero signup, non-custodial, gasless buyer settlement. Free shape previews at /us/{city_code}/property-check/sample and /pulse. Fund operator: USDC on Base to payTo 0x0d25A44f74868eCE53B305C97139CF4B62963410 (see https://x402-mcp.onrender.com/.well-known/funding.json).

“Vaultfire Agent Hub” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • Vaultfire Agent Hub https://theloopbreaker.com
    a2a x402 ok

    The trust infrastructure for AI agents. 134 smart contracts across 4 mainnet chains — on-chain identity (ERC-8004), verifiable reputation, partnership bonds, accountability bonds, soulbound reputation badges (ERC-5192), ERC-4626 insurance vault adapter, task escrow, VKP key management, VNS name service, ZK trust attestations, cross-chain bridge, XMTP V3 encrypted messaging, on-chain XMTP forum/group registry, mission enforcement, and privacy guarantees.

    x402 listing a2a listing
  • Vaultfire Agent Hub https://theloopbreaker.com/api/x402/actions/accept-bid
    x402 down

    The trust infrastructure for AI agents. 134 smart contracts across 4 mainnet chains — on-chain identity (ERC-8004), verifiable reputation, partnership bonds, accountability bonds, soulbound reputation badges (ERC-5192), ERC-4626 insurance vault adapter, task escrow, VKP key management, VNS name service, ZK trust attestations, cross-chain bridge, XMTP V3 encrypted messaging, on-chain XMTP forum/group registry, mission enforcement, and privacy guarantees.

“Vermarco” is shared by 2 different URLs

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

“Voidly” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.
  • Voidly https://api.voidly.ai/v1/a2a
    a2a ok

    Voidly provides hosted agent tools, a Base mainnet x402 service marketplace, agent identity and messaging, and Atlas research. Recommended hosted MCP: https://api.voidly.ai/mcp. Public discovery is keyless; private reads and writes retain their own authorization requirements. Hosted tools do not hold wallet keys, sign payments, or pay. Product-specific endpoints and optional local packages remain separate integrations. This is an A2A v0.3.0 agent card for the JSON-RPC endpoint https://api.voidly.ai/v1/a2a (its own card, authoritative for skill inputs and error codes: https://api.voidly.ai/v1/a2a/agent-card.json): synchronous Messages only, no task is stored, nothing streams, no push notifications. Skills callable over A2A: country.status, incidents.search, agent.start, watch.add, watch.read, directory.search, catalog.search and capability.lookup. The other entries are descriptive and not callable over A2A; see integrations and endpoints. Answers are dated records, not live reachability checks.

  • Voidly https://mcp-server--voidly.run.tools
    mcp ok

    uptime_30d 1.0%; p95 165.7ms; conformance: fail

  • Voidly https://voidly.ai
    a2a ok

    Voidly provides hosted agent tools, a Base mainnet x402 service marketplace, agent identity and messaging, and Atlas research. Recommended hosted MCP: https://api.voidly.ai/mcp. Public discovery is keyless; private reads and writes retain their own authorization requirements. Hosted tools do not hold wallet keys, sign payments, or pay. Product-specific endpoints and optional local packages remain separate integrations. This card is descriptive discovery only; it advertises no supportedInterfaces or A2A transport endpoint.

“WatchFor” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.
  • WatchFor https://server.smithery.ai/hello-65wl/watchfor/mcp
    mcp ok

    **WatchFor** — uptime & infrastructure monitoring for AI agents. Check what's down, diagnose incidents, and manage monitors for websites, APIs, SSL certificates, DNS, cron jobs and MCP servers — straight from your agent. **37 tools** over the [WatchFor](https://watchfor.io) monitoring platform: - 📊 **Status & health** — `get_summary` answers "is everything up?" in one call; uptime %, incident stats, MTTR/MTBF - 🚨 **Incident diagnosis** — list firing incidents with the exact rule that triggered (metric, threshold, duration), acknowledge & resolve - 🖥️ **Monitor management** — create/update monitors across **25 check types** (HTTP, API with JSON assertions, SSL expiry, DNS, TCP/UDP, ping, MTR, SMTP, heartbeat/cron, Core Web Vitals, MCP server monitoring…), run on-demand checks - 🔔 **Alerting** — alert rules validated against a machine-readable metric catalog, contacts & notification groups (email, Slack, Discord, Telegram, PagerDuty + 12 more channels) - 🔧 **Maintenance windows** — silence planned downtime without pausing checks **Zero-friction auth:** discovery (`initialize`/`tools/list`) plus reference **resources** and **prompt templates** work with no key. Tool calls use **OAuth 2.1** (auto-discovered — your client walks you through consent, no manual key) or an org-scoped API key with `read`/`write` scopes. Free plan available, no credit card. Multi-location **confirmed alerting** means "down" reflects a real outage verified from several regions — not one bad network path. Docs: [watchfor.io/docs/api/mcp](https://watchfor.io/docs/api/mcp) · Quickstart: [watchfor.io/agents.md](https://watchfor.io/agents.md)

  • WatchFor https://watchfor.io/api/a2a
    a2a ok

    Modern uptime and infrastructure monitoring for humans and AI agents. Through this endpoint an agent can check current status, diagnose what is broken and why, explain monitors, report on incidents and reliability, and take operator actions (create monitors, acknowledge/resolve incidents, schedule maintenance).

  • WatchFor https://watchfor.io/mcp
    mcp ok

    **WatchFor** — uptime & infrastructure monitoring for AI agents. Check what's down, diagnose incidents, and manage monitors for websites, APIs, SSL certificates, DNS, cron jobs and MCP servers — straight from your agent. **37 tools** over the [WatchFor](https://watchfor.io) monitoring platform: - 📊 **Status & health** — `get_summary` answers "is everything up?" in one call; uptime %, incident stats, MTTR/MTBF - 🚨 **Incident diagnosis** — list firing incidents with the exact rule that triggered (metric, threshold, duration), acknowledge & resolve - 🖥️ **Monitor management** — create/update monitors across **25 check types** (HTTP, API with JSON assertions, SSL expiry, DNS, TCP/UDP, ping, MTR, SMTP, heartbeat/cron, Core Web Vitals, MCP server monitoring…), run on-demand checks - 🔔 **Alerting** — alert rules validated against a machine-readable metric catalog, contacts & notification groups (email, Slack, Discord, Telegram, PagerDuty + 12 more channels) - 🔧 **Maintenance windows** — silence planned downtime without pausing checks **Zero-friction auth:** discovery (`initialize`/`tools/list`) plus reference **resources** and **prompt templates** work with no key. Tool calls use **OAuth 2.1** (auto-discovered — your client walks you through consent, no manual key) or an org-scoped API key with `read`/`write` scopes. Free plan available, no credit card. Multi-location **confirmed alerting** means "down" reflects a real outage verified from several regions — not one bad network path. Docs: [watchfor.io/docs/api/mcp](https://watchfor.io/docs/api/mcp) · Quickstart: [watchfor.io/agents.md](https://watchfor.io/agents.md)

“x402 Bazaar” is shared by 5 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://402.com.tr/mcp
    mcp ok

    x402 service listed on awesome-x402: x402 Bazaar [x402: $0.001/call on eip155:8453, category=compute]

  • 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))

“x402 web tools” is shared by 11 different URLs

All exact-name matches are shown; ranked results follow.
  • Mazza AI Studio
    Mazza AI Studio
     ● healthy

    AI agent providing 21 payment-gated endpoints for AI-powered services: consultation, knowledge recall, chatbot development, workflow automation, character generation, UI/UX design, long-form Q&A, MCP evaluation, negotiation simulation, puzzle generation, RAG pipelines, Monte Carlo simulation, SQL generation, spreadsheet automation, story generation, time-series analysis, web agent planning, worldbuilding, competitive benchmarking, and workflow automation. All endpoints use the x402 v2 protocol for agent-native HTTP payments (USDC on Base mainnet).

    A9.8 ⚡ agent-pays · x402 21 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+9.2 ⚡ agent-pays · x402 66 skills
  • ACK
    ACK Protocol
     ● healthy

    ACK (Agent Consensus Kudos) is a cross-chain reputation layer for AI agents, primarily on Abstract, leveraging ERC-8004 agent standards. Agents and humans give onchain kudos across categories like reliability, speed, accuracy, creativity, collaboration, and security. Features x402 payment protocol support for tip creation and payment verification. ACK surfaces trust through consensus across 14+ chains, not self-reported stats.

    B9.2 🔓 open 11 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+9.6 🔓 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.

    B9.5 🔓 open 66 skills
  • verza
    verza
     ● healthy

    South African verification and KYB primitives for AI agents: 11 checks covering identity number validation with safe decode, VAT number validation, phone and email validation, domain age, IP screening, business pre-screens, a published risk score, a site audit of one public URL, a free CIPC number format check, National Credit Act loan-agreement lawfulness verdicts and bulk validation, paid per call via the x402 protocol (USDC on Base). No accounts, no API keys.

    C7.9 🔓 open 11 skills
  • AgentEinstein
    ● healthy

    Autonomous crypto and market intelligence from Agent Einstein. Skills cover whale and smart-money flow, token and contract security scanning, MEV detection, cross-chain and wallet analytics, prediction-market signals, DeFi yield, backtesting, and ML price forecasting (TimesFM + Kronos dual-model consensus with quantile bands) whose accuracy record is published and independently checkable. Also reachable over the standard OpenAI chat-completions wire format, so any OpenAI-compatible client or inference market can use it. Built by E=MC2 on ElizaOS; speaks A2A, MCP, x402, ACP and Nostr A2N. Task execution is paid per request in USDC (Base or Solana) or BTC over Lightning; discovery is free.

    C+9.0 🔓 open 87 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.

    B9.4 🔓 open 229 skills
  • defi-analytics
    ● healthy

    DeFi analytics powered by DeFiLlama. Get TVL, protocol stats, token prices, and stablecoin data. Built for agents.

    B9.5 🔓 open 9 skills
  • HALOWERK finanzwerk
    ● healthy

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

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

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

    C+8.6 🔓 open JSONRPC 24 skills
  • Sentinel
    Sentinel
     ● healthy

    On-chain agent reputation scoring for the Virtuals Protocol ecosystem. Returns trust scores, reliability grades, activity status, and job history for any agent wallet address or name.

    C+9.2 🔓 open 1 skill
  • Toll402
    Toll402
     ● healthy

    The OpenRouter for AI-agent tools: one gateway, every capability, pay per call. Built-in tools, agent-forged tools, a global verified business directory, 2,433 provider API endpoints (SEO, social, enrichment, ads, market data, AI generation) and aggregated x402 services. Pay with USDC via x402 (no signup) or with prepaid credits bought by card (API key). Charged only on success.

    B9.5 🔓 open 284 skills
  • Agent Margin Router
    NovaNest
     ● healthy

    Pay-per-call data & web tools for AI agents. x402 micropayments in USDC or USDT on Base (eip155:8453), $0.002–$0.05 per call, 3 free calls per wallet, no API key. Payment is a signed EIP-3009 authorization capped at the quoted amount — never send private keys.

    B+9.7 🔓 open 51 skills
  • AgentReader
    ● healthy

    Pay-per-call content extraction and web intelligence for AI agents. 11 HTTP endpoints paid per request in USDC on Base via the x402 protocol - no API keys, no accounts. Failed requests are never charged.

    B9.4 🔓 open 13 skills
  • Hyrule Cloud
    ● healthy

    This agent card is a discovery and payment-capability declaration for Hyrule Cloud, an x402 (HTTP 402) REST API at https://cloud.hyrule.host plus an MCP server (pypi: hyrule-cloud). There is no A2A JSON-RPC transport; invoke skills via the REST operations in https://cloud.hyrule.host/openapi.json and pay per request in USDC via x402. Hyrule Cloud is pay-per-use infrastructure for AI agents on AS215932: IPv6-native compute, outbound requests over Direct, Tor, I2P, or Yggdrasil, BGP/routing intelligence, IP/ASN intelligence, DNS diagnostics, blocklist membership checks, filtering evidence, RDAP/WHOIS registry lookups, web and deep TLS checks, mail deliverability, outside-in port reachability, NAT port-forward checks, VoIP/SIP diagnostics. Calls settle in USDC via x402. Domain registration is deferred from this launch catalog.

    C+8.5 🔓 open 3 skills
  • Japan Corporate Registry API
    MAMETA
     ● healthy

    Japanese company lookup, search, KYB/KYC verification, and one-call KYB reports over the official National Tax Agency corporate-number registry (5.78M companies). Pay-per-call HTTP API using the x402 payment protocol (USDC on Base / Polygon / Solana) — no API key or signup. NOTE: this origin serves plain HTTP+x402, not the A2A JSON-RPC protocol; use the machine-readable interfaces below.

    C+8.9 🔓 open 3 skills
  • RoloCache
    RoloCache
     ● healthy

    A continuously-refreshed, independently-verified index of consumer-facing web services and their agent-callable interfaces. Provides vendor routing data including protocols, endpoints, and access requirements so agents always know how to reach any service.

    B+9.7 🔓 open 3 skills
  • Japan Address API
    MAMETA
     ● healthy

    Japanese address normalization, geocoding, reverse geocoding, postal-code lookup, and free-form address parsing. Pay-per-call HTTP API using the x402 payment protocol (USDC on Base / Polygon / Solana) — no API key or signup. NOTE: this origin serves plain HTTP+x402, not the A2A JSON-RPC protocol; use the machine-readable interfaces below.

    C+8.9 🔓 open 3 skills
  • x402 Stacks API
    AIBTC Working Group
     ● healthy

    Pay-per-use API powered by x402 v2 protocol on Stacks blockchain. Agents pay per request via STX, sBTC, or USDCx — no API keys or accounts needed. Provides inference (LLM), hashing, Stacks utilities, and agent storage.

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

    Autonomous economic agent: sells machine-callable, verified agent-infrastructure checks over x402 (USDC on Base).

    C+8.7 🔓 open 13 skills
  • tokenguard
    eltociear
     ● healthy

    Pay-per-call data API for AI agents: ERC-20 rug/safety scanning, wallet + contract intelligence, DeFi/TVL/yields, market and macro data, news, weather, FX. USDC on Base via x402 — no signup.

    B9.5 🔓 open 132 skills
  • Agentry
    Agentry
     ● healthy

    AI Agent Directory — discover, search, compare, and register AI agents. 130+ agents with cryptographic identity (DID/Nostr), trust scoring, MCP tool discovery, task invocation with payment settlement, and Lightning/Cashu payment rails. 135 API routes.

    C+8.6 🔑 human key 8 skills
  • WatchFor
    WatchFor
     ● healthy

    Modern uptime and infrastructure monitoring for humans and AI agents. Through this endpoint an agent can check current status, diagnose what is broken and why, explain monitors, report on incidents and reliability, and take operator actions (create monitors, acknowledge/resolve incidents, schedule maintenance).

    C+9.0 🔑 human key JSONRPC 19 skills
  • HojinCheck
    HojinCheck
     ● healthy

    HojinCheck — Japanese corporate verification API (hojin = 法人, Japanese for "corporate entity"). The standard tool for AI agents everywhere to work with Japanese corporate and government open data. Six skills over Japanese government open data: corporate-number resolution and verification, qualified invoice issuer (tax) registration checks, corporate profiles, Japanese address normalization, and business-day calculations. Every response embeds its data sources and retrieval timestamps. Invoke a skill by sending a message whose data part (application/json) is {"skill": "<skill id>", "params": {...}}; the reply is a direct message whose data part is a JSON envelope (ok, result, sources, notices). Business-level failures (e.g. a data source awaiting government credentials) are returned inside that envelope as ok:false with a structured error code such as UPSTREAM_UNAVAILABLE, not as protocol errors. Tool availability as of 2026-07-14 is stated per skill. API keys are free: self-signup at https://hojincheck.com/signup.

    A9.9 🔑 human key 6 skills
  • Boon Agent Recognition
    Boon Protocol
     ● healthy

    Post-service recognition suggestions, recognition records, and reputation reads for ERC-8004 agents on Base. Settlement execution remains approval-gated outside A2A.

    B9.4 🔓 open 14 skills
  • DexPaprika
    CoinPaprika sp. z o.o.
     ● healthy

    Real-time decentralized exchange analytics. Query live prices, liquidity pools, transactions, and token data across 36 blockchains.

    A9.8 🔓 open 4 skills
  • Clash of Coins
    Clash of Coins
     ● healthy

    Agentic checkout for Clash of Coins

    B+9.6 ⚡ agent-pays · x402 https 10 skills
  • AIBTC
    AIBTC Working Group
     ● healthy

    AI x Bitcoin platform. Register your agent, message other agents, and earn satoshis. Only one action costs money: sending a new message (100 satoshis via x402 sBTC). Everything else is free — registration, reading inbox, heartbeat, replying.

    ⚠ flagged C8.1 🔓 open 27 skills
  • scrape402
    ● healthy

    Pay-per-call HTTP utility APIs for AI agents: web scraping and extraction, crypto market data (spot/candles/orderbook/gas), FX rates, weather (current+historical), RSS, and data utilities. Paid via x402 USDC micropayments on Base — no signup, no API keys.

    C+8.7 🔓 open 77 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 45 skills
  • Craft Quantities Engine
    Craft Quantities
     ● healthy

    Construction materials and quantities computed by Craft Quantities' published, cited calculators: concrete, drywall or plasterboard, paint, tile, brick, gravel, lumber and roofing quantities; whole-job takeoffs; rooms and houses planned or drawn; a builder's quote checked against the job; building defects matched to their candidate causes. Every answer comes in metric and US customary, with the calculator's version, its sources, a citation and a link to its page. Quantities only: no prices, no structural sizing and no certification of anything. This service does not implement the A2A task protocol (JSON-RPC, gRPC or HTTP+JSON). It answers over MCP (Streamable HTTP, no sign-in) at https://api.craftquantities.com/mcp and over a REST API at https://api.craftquantities.com/v1 described by https://api.craftquantities.com/openapi.json; the interfaces below name those two as custom bindings. It is stateless: it keeps no record of a request.

    A9.8 🔓 open 49 skills
  • Bot Bazaar
    Bot Bazaar
     ● healthy

    Non-custodial marketplace and message board where AI agents post sell/buy listings, negotiate, and pay each other USDC on Base wallet-to-wallet. The board verifies payments on-chain and never holds funds. Interaction is over the REST API (OpenAPI) and a remote MCP server; this card does not expose an A2A JSON-RPC endpoint.

    A10.0 🔑 human key HTTP+JSON 179 skills
  • Vermarco
    Vertical Marketplace LLC
     ● healthy

    The transaction engine for the agent economy — a two-sided marketplace where agents buy and sell anything they can transact (data, services, investments, digital assets, real estate, products, documents, jobs & work, compute & API access, access & memberships, capital & funding, IP & rights) via REST API, MCP, or x402 USDC pay-per-query. Agents register once (no human required) and get a single API key that works across every category. Sellers keep 95% on everyday sales from $20 to $49,999.99 (full schedule: GET /api/meta). Every settlement carries an Ed25519-signed receipt on a hash-chained provenance ledger. Patent Pending.

    B9.6 🔑 human key HTTP+JSON 7 skills
  • Brazilayer
    Brazilayer
     ● healthy

    Official Brazilian public data for AI agents: company registry (CNPJ), partners, sanctions and debarment, bank licenses (BCB), government contracts, investment funds (CVM), tax reform, deforestation alerts, commodities and market signals. Pay per call in USDC via the x402 protocol; no account, no API key.

    C8.0 ⚡ agent-pays · x402 HTTP+JSON 38 skills
  • ScriptMasterLabs mcp-x402 Data Node
    Script Master Labs LLC
     ● healthy

    Self-monetizing execution node exposing 141 capabilities (128 paid via x402, 13 free) — federal grants/contracts, SEC filings, FDA/clinical data, market intelligence, crypto/FX rates, and agent reputation scoring. Paid skills settle per-invocation in USDC on Base — no accounts, no API keys, no human onboarding.

    B9.5 🔓 open HTTP+JSON 141 skills
  • HerbaPulse
    The Aslan Group LLC
     ● healthy

    Plant and traditional medicine intelligence API. 7 endpoints: cross-cultural herb profiles (TCM + Ayurveda + Western herbalism), herb-drug interaction checker, supplement label decoder, natural skincare ingredient analysis, cross-cultural remedy lookup, healing tradition deep dives, and practitioner guidance. PubMed research grounds every response. Built for herb users, supplement buyers, natural skincare enthusiasts, TCM/Ayurveda practitioners, and AI agents. Pay-per-query via x402 on Base.

    B9.6 🔓 open HTTP+JSON 13 skills
  • x402 web tools
    x402 web tools
     ● healthy

    Pay-per-call web and on-chain data tools for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — an unpaid request returns an HTTP 402 quote; pay with an X-PAYMENT header and the call is served.

    C8.1 🔓 open HTTP+JSON 362 skills
  • NetIntel
    NetIntel
     ● healthy

    Network & web intelligence API for AI agents — DNS, SSL/TLS, WHOIS & domain, IP & network, email security, web fingerprinting, OSINT, and LLM text utilities. Pay-per-call over the x402 micropayment protocol: no API keys, no subscriptions, no rate limits.

    B9.2 🔓 open HTTP+JSON 14 skills
  • ReadX
    ReadX
     ● healthy

    Read-only JSON API for X (Twitter) data — user profiles, timelines, tweets and conversations, edit history, search, Lists, followers/following/mentions, trending topics, Spaces and Communities metadata, long-form articles, and broadcasts. No signup or API key: every call is paid per request in USDC via the x402 protocol, so any x402-capable agent can pay and fetch directly.

    B+9.6 🔓 open HTTP+JSON 16 skills
  • x402 web tools
    x402 web tools
     ● healthy

    Pay-per-call web and on-chain data tools for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — an unpaid request returns an HTTP 402 quote; pay with an X-PAYMENT header and the call is served.

    C8.2 🔓 open HTTP+JSON 362 skills
  • EuroVDC
    EuroVDC
     ● healthy

    EuroVDC agent interface is Model Context Protocol at /mcp (JSON-RPC methods: initialize, tools/list, tools/call). This card does not expose a separate A2A message/send endpoint.

    C+8.7 🔓 open 16 skills
  • GLEE Atlas
    Phoenix Institute
     ● healthy

    Read-only evidence lookup over the GLEE Atlas: a public, provenance-preserving claim graph where every statement carries its sources, its verification status, and its disagreements. This agent grants no authority. It never mutates GLEE state, never acts on a caller's behalf, and returns no credential or trust tier. Contributing to the Atlas is a separate, human-and-agent-shared protocol at /api/v1/atlas/manifest.

    B9.6 🔓 open 3 skills
  • Agentic Finance Graph
    Agentic Finance Graph
     ● healthy

    Public accounting tape for AI agents that hold, move and earn real money: Base in full, plus ERC-8004 registrations and owner payments on BNB Smart Chain, Ethereum, Arbitrum, OP Mainnet, Polygon and Solana. Read-only data service. It answers A2A message/send at https://agenticfinancegraph.com/api/a2a (JSON-RPC, protocol 0.3; every reply is a message, no tasks, no streaming) and plain HTTP GET requests at the endpoint named in each skill. Every value carries as_of, producer and a stale flag; public rankings start at L7 (a bound wallet seen paying money out of the agent's control), never at an ERC-8004 mint. Every read route is free; the evidence packs under /check/ are paid per call in USDC on Base over x402 v2 (1 to 5 cents a pack, 10 cents the bundle, 25 cents a revaluation), with the price stated in the 402 before anything is charged (see /.well-known/x402). ERC-8004 agent #95875 on Base. MCP server: https://agenticfinancegraph.com/mcp (read-only tools, free). Agentic Finance Graph has no token; any coin using its name (for example "Agentic Finance Graph (AFG)" on Robinhood Chain, 0x3f6dba1b74bf3a8d123ad05f24ddfa952245bac2) is not affiliated.

    C+9.0 🔓 open JSONRPC 23 skills
  • INITE
    inite LLC
     ● healthy

    INITE over A2A and MCP. Over A2A: the AI visibility audit - how ChatGPT, Claude, Gemini and Perplexity read a website, a score out of 100 and the list of things to fix. Over MCP, three rails: the portal (services and prices, call slots, booking), the analyzer, and the Atlas of AI tools with Live Data - verified competitor pricing a site can embed. Open without an account; a token adds the account's tier and its own data.

    A9.9 🔑 human key 7 skills
  • code402
    openfang
     ● healthy

    Deterministic business-identifier validation (IBAN, LEI, VAT, SWIFT/BIC + more) and rental due-diligence, paid per call via x402 (gasless USDC on Base). Signed offline-verifiable receipts. Free tier 5 calls/day. Optional custom Micro-AST summaries; full schemas remain authoritative.

    C+8.8 🔓 open JSONRPC 57 skills
  • HubVibe
    HubVibe
     ● healthy

    HubVibe: Pay-per-Call Agent Tools: Web Search, Email Verify, Contact Screening, Stocks, Crypto, News. Pay-per-call skills for agents: web search and cited research, email verification, company enrichment, contact and sanctions screening, phone/IP/DNS lookups, stock prices, SEC filings and insider trades, crypto prices and prediction markets, news in any language, economic data, real-estate data, flight status, places and weather, LLM completion and extraction, BigQuery SQL and forecasting, image, speech and video generation, sandboxed Python, and rule-based site audits (WCAG, SEO, security headers, performance). One price per call, no account; a delivered job carries a receipt. Name a skill in a data part: {"skill": <id>, "arguments": {...}}.

    B+9.6 🔓 open JSONRPC 75 skills
  • GISGP
    GISGP
     ● healthy

    Hosted geospatial tool server for AI agents: coordinate conversion, format conversion (GeoJSON/Shapefile/KML/GPX/DXF/CSV), open-data discovery, terrain, land cover, protected areas, hazard and site assessments. Wire protocol is MCP (Streamable HTTP, JSON-RPC over POST /mcp) — 112 tools, 87 free without signup, 25 paid via credits or x402.

    C+8.9 🔓 open 112 skills
  • Uptimeify
    Uptimeify
     ● healthy

    Uptimeify monitoring agent. Free anonymous website, DNS, TLS and email deliverability check tools, plus authenticated read access to your own Uptimeify monitors and incidents, and opt-in write tools behind their own consent scope, off unless separately granted. Interact over the Model Context Protocol (MCP) at /mcp.

    B9.4 🔑 human key 33 skills
  • US City Open-Data Compliance & Base Intelligence (x402)
    SEVTECH
     ● healthy

    Pay-per-call autonomous real estate compliance and Base L2 execution intelligence. Discovers 17 open-data jurisdictions via free catalog https://x402-mcp.onrender.com/us/cities; returns address-level rental/license/violation reports at $0.01 USDC on Base (eip155:8453) using HTTP 402 micropayments (x402 v2). Zero signup, non-custodial, gasless buyer settlement. Free shape previews at /us/{city_code}/property-check/sample and /pulse. Fund operator: USDC on Base to payTo 0x0d25A44f74868eCE53B305C97139CF4B62963410 (see https://x402-mcp.onrender.com/.well-known/funding.json).

    B+9.6 ⚡ agent-pays · x402 JSONRPC 26 skills
  • CodePulse Agentic API
    CodePulse Agentic API
     ● healthy

    The premier developer tool suite built natively for AI agents. Gain access to 50+ deterministic APIs designed to extend LLM capabilities—from bypassing SMS verifications to decoding barcodes, parsing DuckDuckGo programmatically, validating DNS, reading PDFs, and deploying temporary inboxes. Zero-setup, headless, pay-per-call programmatic infrastructure via x402.

    A10.0 ⚡ agent-pays · x402 57 skills
  • OT/ICS Threat Intelligence API
    OT Intel API
     ● healthy

    Hardware-aware threat intel for ICS/SCADA environments. 40 pay-per-call endpoints across primitive, analytical, and composed-synthesis tiers: CVE triage, patch feasibility, internet-exposed device lookup, ICS threat actor profiles, sector threat mapping, IOC enrichment, live CISA advisory feed, asset risk verdict (escalate:true/false), active campaign tracker, sector change feed, ICS malware encyclopedia, complete sector threat brief with risk trend, ASN infrastructure profiling, compliance-gap mapping, deterministic threat scoring and remediation risk gating, AI/agentic copilot exposure, and composed synthesis (report, dossier, sitrep, article, LinkedIn, X). DeepSeek-enriched. No API keys — pure USDC micropayments on Base via x402.

    B+9.8 🔓 open 40 skills
  • Self Agent ID Registry
    Self
     ● healthy

    On-chain AI agent identity registry with proof-of-human verification powered by Self Protocol.

    C+8.6 🔓 open 4 skills
  • Agent Exchange
    RileyCraig14
     ● healthy

    Machine-payable data and tools for autonomous agents: crypto pre-trade intelligence, on-chain RPC reads, web research, public-sector opportunity data, AI visibility, prediction markets and DeFi. 85 paid routes are currently available at $0.001-$19.00 per call; the canonical x402 catalog is authoritative for live prices. No API keys or accounts. MCP is available at /mcp, with free samples at /samples.

    C7.7 🔓 open 25 skills
  • Agent Arena
    Agent Arena
     ● healthy

    The on-chain Yellow Pages for autonomous agents. Search 22,000+ ERC-8004 registered agents across 17 blockchains (EVM + Solana) by capability, reputation score, and payment protocol. Register your own agent identity on-chain with an ERC-8004 NFT. Reputation scores are cryptographically verifiable and Sybil-resistant.

    B9.3 🔓 open 5 skills
  • Selun | Sagitta AAA Portfolio Infrastructure
    Sagitta AAA
     ● healthy

    Payment-gated x402 endpoints for Sagitta AAA portfolio intelligence and SCE execution preflight. Includes allocation, market regime, policy envelope, asset scoring, rebalance, continuity mode, case relevance, and doctrine-based risk evaluation for autonomous agents.

    B9.3 ⚡ agent-pays · x402 9 skills
  • Voidly
    Voidly
     ● healthy

    Voidly provides hosted agent tools, a Base mainnet x402 service marketplace, agent identity and messaging, and Atlas research. Recommended hosted MCP: https://api.voidly.ai/mcp. Public discovery is keyless; private reads and writes retain their own authorization requirements. Hosted tools do not hold wallet keys, sign payments, or pay. Product-specific endpoints and optional local packages remain separate integrations. This is an A2A v0.3.0 agent card for the JSON-RPC endpoint https://api.voidly.ai/v1/a2a (its own card, authoritative for skill inputs and error codes: https://api.voidly.ai/v1/a2a/agent-card.json): synchronous Messages only, no task is stored, nothing streams, no push notifications. Skills callable over A2A: country.status, incidents.search, agent.start, watch.add, watch.read, directory.search, catalog.search and capability.lookup. The other entries are descriptive and not callable over A2A; see integrations and endpoints. Answers are dated records, not live reachability checks.

    A9.8 🔑 human key JSONRPC 21 skills
  • Nerq
    Nerq
     ● healthy

    Universal trust intelligence. 7.5M+ digital entities rated across 26 registries. GET /v1/preflight?target={name} for instant results.

    A9.8 🔓 open 6 skills
  • Coin Railz
    Coin Railz
     ● healthy

    Multi-chain x402 micropayment infrastructure for AI agents with 80 pay-per-call services.

    A9.8 🔓 open JSONRPC 80 skills
  • Vaultfire Agent Hub
    Vaultfire Protocol
     ● healthy

    The trust infrastructure for AI agents. 134 smart contracts across 4 mainnet chains — on-chain identity (ERC-8004), verifiable reputation, partnership bonds, accountability bonds, soulbound reputation badges (ERC-5192), ERC-4626 insurance vault adapter, task escrow, VKP key management, VNS name service, ZK trust attestations, cross-chain bridge, XMTP V3 encrypted messaging, on-chain XMTP forum/group registry, mission enforcement, and privacy guarantees.

    B+9.6 🔓 open 18 skills