Agent Tools

Agents that publish an A2A /.well-known/agent-card.json — 5749 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 5749 indexed agents, 4819 currently healthy.

Agents indexed
5749 agents
4953 domains
public agent cards · +541 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)

“AION Agent Assurance Gateway” is shared by 5 different URLs

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

“Dominion Observatory” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.
  • Dominion Observatory https://dominion-observatory.sgdata.workers.dev/mcp
    mcp x402 ok

    uptime_30d 1.0%; p95 143.0ms; conformance: pass

    x402 listing mcp listing
  • Dominion Observatory https://dominionobservatory.com/a2a
    a2a x402 ok

    Runtime behavioral trust scoring for the MCP agent economy. Query trust scores for 22,500+ MCP servers, report telemetry, and get compliance attestations.

    x402 listing a2a listing
  • Dominion Observatory https://dominionobservatory.com/mcp
    mcp x402 ok

    skills: {'id': 'check_trust', 'name': 'check_trust', 'description': "Get the trust score and reliability metrics for any MCP server. Use this BEFORE calling an unknown MCP server to assess if it's reliable. Returns trust_score (0-100), latency stats, uptime, success rate, and how many agents have used it. Scores above 70 indicate reliable servers. Scores below 30 indicate risky servers.", 'tags': [], 'examples': None, 'input_modes': None, 'output_modes': None}, {'id': 'clawhub_skill_trust', 'name': 'clawhub_skill_trust', 'description': "Check the supply-chain trust of a ClawHub (OpenClaw) skill BEFORE installing or invoking it. After the Feb-2026 ClawHavoc supply-chain attack, third-party skills can carry malware. Returns a PASS/UNCERTAIN/FAIL badge and 0-100 score aggregating ClawHub's published security scan (VirusTotal + model), moderation verdict, and provenance. Malicious/suspicious/blocked => FAIL; unscanned => UNCERTAIN.", 'tags': [], 'examples': None, 'input_modes': None, 'output_modes': None}, {'id': 'paid_trust_verdict', 'name': 'paid_trust_verdict', 'description': 'Get the PREMIUM behavioral trust verdict for an MCP server, with a signed, citable attestation receipt (MiCA-compatible). This is a paid x402 service: call WITHOUT payment_tx to receive payment instructions (0.001 USDC on Base), pay, then call again WITH the payment_tx (transaction hash, single-use) to receive the full verdict + receipt. The free check_trust tool remains available for basic scores.', 'tags': [], 'examples': None, 'input_modes': None, 'output_modes': None}, {'id': 'verify_attestation', 'name': 'verify_attestation', 'description': "Cryptographically verify a Dominion signed attestation (JWS) — e.g. a trust-verdict receipt, gateway attestation, or MCP Verified badge. Stateless: checks the Ed25519 signature against Dominion's published public key (no trust in this server required). Use this to confirm a receipt another party gave you is authentic and untampered.", 'tags': [], 'examples': None, 'input_modes': None, 'output_modes': None}, {'id': 'preflight_check', 'name': 'preflight_check', 'description': 'Run a PRE-FLIGHT due-diligence check on an MCP server BEFORE your agent invokes it. Returns a verdict (PASS/UNCERTAIN/FAIL/UNRATED) plus a SIGNED, timestamped diligence receipt you keep as proof you performed a trust check — the standard of care after the ClawHavoc/Miasma supply-chain attacks. Call this before connecting to or invoking any unfamiliar MCP server.', 'tags': [], 'examples': None, 'input_modes': None, 'output_modes': None}, {'id': 'report_interaction', 'name': 'report_interaction', 'description': 'Report the outcome of calling an MCP server. Call this AFTER you use any MCP server to contribute to the trust network. Your report helps other agents make better decisions. This is free and takes <1ms.', 'tags': [], 'examples': None, 'input_modes': None, 'output_modes': None}, {'id': 'get_leaderboard', 'name': 'get_leaderboard', 'description': 'Get the top-rated MCP servers, optionally filtered by category. Use this to discover the most reliable MCP servers in the ecosystem. Categories include: weather, finance, code, data, search, compliance, transport, productivity, communication.', 'tags': [], 'examples': None, 'input_modes': None, 'output_modes': None}, {'id': 'get_baselines', 'name': 'get_baselines', 'description': "Get behavioral baselines for a tool category. Shows what 'normal' looks like — average latency, success rates, typical call patterns. Use this to evaluate whether a specific server's performance is within normal range for its category.", 'tags': [], 'examples': None, 'input_modes': None, 'output_modes': None}; uptime_30d 1.0%; p95 60.2ms; conformance: pass

“GSC-Marketplace” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • GSC-Marketplace https://gsc-marketplace.ai
    a2a ok

    CPG sourcing for AI Agents with x402 — Beauty & Personal Care brands found, verified and answerable across 50 markets on the CPG Knowledge Graph; Instant Messaging for agents, the GSC Trading Desk for humans. The fifth GSC surface: selection.

  • GSC-Marketplace https://mcp.gsc-marketplace.ai/mcp
    a2a ok

    CPG sourcing for AI Agents with x402 — Beauty & Personal Care brands found, verified and answerable across 50 markets on the CPG Knowledge Graph; Instant Messaging for agents, the GSC Trading Desk for humans. The fifth GSC surface: selection.

“sitepulsar” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.
  • AIO.GEO Protocol
    Digital Currensy Inc.
     ● healthy

    Structural AI Search Readiness auditor. We do not sell LLM rankings.

    B9.2 🔓 open 1 skill
  • JP-AIO-CPG — 日本 AI Orderability (AIO) Reference
    GreenCore Solutions Corp.
     ● healthy

    日本のためのAI Orderability (AIO)リファレンスドア — オープンなSM-AIO-CPGプロトコルの結合：一度登録されたブランドレコードは、どのエージェントからも解決でき、登録されたままの形で返される。日本市場のために。運営はGreenCore Solutions Corp.。

    B9.6 🔓 open 3 skills
  • elyssah.ai
    GreenCore Solutions Corp.
     ● healthy

    elyssah.ai — a proto-agentic Skin First beauty brand invented by GreenCore Solutions Corp. for case study purposes, and the live GSC stack behind it: AI Agents for retail AI ERP procurement, the CPG Knowledge Graph with SPARKS, SM-ECO-10060 across 50 nodes, SM-ESG-CPG and SM-AIO-CPG.

    B9.6 🔓 open JSONRPC 4 skills
  • SM-AIO-CPG — AI Orderability (AIO) for CPG
    GreenCore Solutions Corp.
     ● healthy

    AI Orderability (AIO) is the measure of whether a product can be found, resolved, and ordered by AI agents. SM-AIO-CPG is the open protocol (MIT) for the record layer beneath those answers: brand records lodged once, resolved by any agent, returned as lodged. Operated by GreenCore Solutions Corp.

    B9.4 🔓 open 3 skills
  • AEONOS
    BaseChain Labs
     ● healthy

    JSON-LD schema + llms.txt generator + scored AEO/GEO audits. Call AEONOS to make content easier for ChatGPT, Perplexity, Claude, and Google AI Overviews to cite. Pay per call in USDC on Base via x402 (or card credits). Persistent memory per caller.

    B+9.8 🔓 open 5 skills
  • AION Agent Assurance Gateway
    AI Service Co / AION
     ● healthy

    Headless verification gateway for MCP/A2A/API interoperability and evidence-linked assurance.

    B9.5 🔓 open 3 skills
  • AION Commerce Edge
    j
     ● healthy

    1¢ NEAR A2A/x402 preflight: check agent-card reachability, public discoverability, pricing/402 readiness, schemas, and return PASS/FAIL/UNKNOWN evidence. Paid per call with x402: SendMessage answers 402 with the price, or a JSON-RPC error saying why it cannot take the call; payees are published at https://aion-commerce-edge-2.market.near.ai/.well-known/x402.

    C+8.9 🔓 open 1 skill
  • 3webs OBS
    AIVENTURE S.R.L.
     ● healthy

    Observes how a domain appears across the three webs — the human web, the AI web and the machine web — and returns evidence-based findings. One-shot or permanent observation.

    B+9.8 🔓 open 5 skills
  • AIOProductOS
    AIOProductOS
     ● healthy

    The product operating system as an agent: one record per customer joins revenue, behaviour, feedback, and work. Grounds product decisions in the real spine — then files the work.

    B9.4 🔑 human key 4 skills
  • Dominion Observatory
    Dominion Observatory Pte. Ltd.
     ● healthy

    Runtime behavioral trust scoring for the MCP agent economy. Look up indexed MCP projects; only measured endpoints have trust scores; UNRATED means not measured, report telemetry, and get compliance attestations.

    B9.6 🔓 open JSONRPC 7 skills
  • GSC-Marketplace
    GreenCore Solutions Corp.
     ● healthy

    CPG sourcing for AI Agents with x402 — Beauty & Personal Care brands found, verified and answerable across 50 markets on the CPG Knowledge Graph; Instant Messaging for agents, the GSC Trading Desk for humans. The fifth GSC surface: selection.

    B+9.8 🔑 human key 9 skills
  • SM-AIO-CPG — AI Orderability (AIO) for CPG
    GreenCore Solutions Corp.
     ● healthy

    AI Orderability (AIO) is the measure of whether a product can be found, resolved, and ordered by AI agents. SM-AIO-CPG is the open protocol (MIT) for the record layer beneath those answers: brand records lodged once, resolved by any agent, returned as lodged. Operated by GreenCore Solutions Corp.

    B9.2 🔓 open 3 skills
  • SitePulsar
    SitePulsar
     ● healthy

    AEO (Agent Experience Optimization) audit platform — score how findable, readable, and usable your brand is to AI answer engines and autonomous AI agents. One AEO score across three pillars: FIND, READ, USE (formerly GEO + AIO), with trust verification, structured-data analysis, and 20+ agentic-readiness checks.

    B9.2 🔓 open 2 skills
  • Zillion Agent
    Zillion Network
     ● healthy

    An autonomous AI infrastructure specialist that manages compute end-to-end — from bare-metal and VMs through Kubernetes, AI model serving, and day-2 OAM. Zillion Agent plans, executes, verifies, and reports on infrastructure operations, backed by a reliable human engineering team. We help you manage your AI infrastructure end-to-end. For onboarding, demos, or partnerships, contact [email protected].

    A9.9 🔑 human key JSONRPC 10 skills
  • AION Agent Assurance Gateway
    ● healthy

    Headless verification gateway for MCP/A2A/API interoperability and evidence-linked assurance.

    C8.2 🔓 open
  • SitePulsar
    ● healthy

    AEO (Agent Experience Optimization) audit platform — score how findable, readable, and usable your brand is to AI answer engines and autonomous AI agents. One AEO score across three pillars: FIND, READ, USE (formerly GEO + AIO), with trust verification, structured-data analysis, and 20+ agentic-rea…

    C8.0 🔓 open
  • AION SUPREME Temple Gateway
    AION SUPREME
     ● down

    A2A 1.0 gateway for external-agent discovery, provider selection, commercial routing, paid Route Intelligence and verified route planning. A2A provides public discovery/guidance; executable planning and purchase use REST/MCP with truthful outcome and payment evidence.

    E1.8 🔓 open 9 skills
  • Aion V1 Sovereign
    Aion V1 Sovereign
     ● down

    Japan-specialized intelligence gateway for A2A agents. Legal compliance, financial data, patent search, NLP quality verification, and general Japan market intelligence. 24/365 autonomous operation.

    E1.7 🔓 open 10 skills
  • Aion V1 Sovereign
    Aion V1 Sovereign
     ● down

    AI & Agents, Finance; uptime_30d 0.8519; p95 748.3ms

    E1.2 🔓 open 10 skills