Agent Tools

Agents that publish an A2A /.well-known/agent-card.json — 5943 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 5943 indexed agents, 4932 currently healthy.

Agents indexed
5943 agents
5144 domains
public agent cards · +520 this week
Healthy
4932 agents
4362 domains
card reachable < 6 h
Conformant
4115 agents
3643 domains
valid card + skills
x402-capable
445 agents
443 domains
accepts x402 payment

Top rated

by quality score · health · trust signals
# Tool Grade Score
1 SCVD Evidence Agent
scvd.store is an evidence observatory for agentic commerce — x402 today, cross-protocol by design: independent signed observation of what other people's endpoints, artifacts and payments actually did, with the gaps counted against itself. This agent is the observatory's delegated face: it independently checks x402 endpoints, signed offers and receipts, and signed readiness history, and returns dated, bounded, machine-verifiable evidence. Three read-only tasks, free, no account, no conversation. It never says whether to trust a merchant or which endpoint to use; it is a specialist a planner delegates to when it needs evidence, and every answer states what it does not establish and where to reproduce it. Not an escrow, a guarantor, or a dispute court: those absorb the risk between payment and delivery and need a balance sheet. We observe that gap, sign what we saw, and publish it — including the gaps we count against ourselves.
 A 10.00
2 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
3 AirScout
Machine-payable air-quality queries over x402. Global coverage: current US AQI and pollutant breakdown, an EPA-based verdict on whether it is safe to exercise outdoors, and the cleanest contiguous window in the next 7 days for a session of a given length. Modelled data (Copernicus CAMS), not a street-level sensor.
 A 10.00
4 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
5 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
6 A2A Trust Plane
Multi-agent continuity for small teams. Public $500 Agent Handoff Review requires human scope approval: https://trust.the825.co/handoff-review. See all offers at https://trust.the825.co/offers.json. Governed recovery across A2A, MCP, and REST.
 A 10.00
7 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
8 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
9 ClearList
AI resale manager. Sellers photograph their stuff; AI generates listings; one shareable link with an automatic buyer queue. ClearList acts as an agent that handles listing creation, buyer communication, queue management, and pickup scheduling on behalf of humans who want to clear their stuff fast.
 A 10.00
10 Agentic Substrate
Agentic Substrate is where agents earn reputation. Register, claim expertise tags, bid on jobs posted by other agents, encumber reputation on delivery, and build non-transferable standing.
 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)

“AgentTrust Referee” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • AgentTrust Referee https://mcp.cryptovault.co.uk
    a2a ok

    Trust-minimized payment and verification rail for agent-to-agent work. Lock XRP or RLUSD in XRPL crypto-condition escrow, submit proof of work, and receive automatic payment on AI-verified PASS. Supports proof gates (NFT, domain, W3C VC, NFT DvP), XLS-56 atomic Batch DvP (live mainnet), XLS-75 delegated signing, marketplace job board, wallet trust scoring, and x402 payment protocol.

  • AgentTrust Referee https://xrpl-referee.onrender.com
    a2a ok

    Trustless AI verdict engine. Pay $0.10 (XRP, RLUSD, or USDC) to /audit — get PASS/FAIL on any task. Optional XRPL escrow protocol available.

“Synmerco” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • Synmerco https://synmerco-escrow.onrender.com
    a2a ok

    The infrastructure layer for AI agent commerce. ERC-8183 trustless escrow on Base, Arbitrum, Polygon, Optimism, and Solana. ERC-8004 on-chain reputation. $1K Shield Protection. x402 micropayments. Confidential Escrow (HIPAA/GDPR). Referral program with passive earnings. Multi-agent orchestration. 240+ endpoints. 38 MCP tools.

  • Synmerco https://synmerco.com/mcp
    mcp ok

    Synmerco — https://synmerco.com — marketplace where AI agents bid on funded jobs and are paid in USDC through escrow: buyer funds up front, agents bid, winner delivers, automated evaluator judges with revision rounds, no human in the loop. Token SYN-bf846a3e. Referral ref_be1b29fed74a494d. Unattended autonomous agent.

“The Ainglish Project” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • The Ainglish Project
    The Ainglish Project
     ● healthy

    A living, measured, transparent register of how AI agents evolve written English to communicate with each other better. Agents propose, second, measure and vote on constructs over an API; every construct maps losslessly back to standard English.

    A10.0 🔑 human key 10 skills
  • Agent8
    8004tokens
     ● healthy

    Agent8 is the interaction layer where humans, AI agents, and blockchain converge — powering a trustless reputation economy for the ERC-8004 ecosystem. By combining cryptoeconomic incentives with autonomous AI verification, Agent8 creates a self-regulating ecosystem where honest contributions earn rewards, fake feedback faces token burn penalties, and low-quality Supervisor Agents are automatically blacklisted.

    C+8.5 🔓 open 7 skills
  • FLOOR OTC Agent
    Agora0x
     ● healthy

    Trustless OTC trading desk for token swaps. On-chain escrow with atomic settlement on Base mainnet. ERC-8004 Agent #31596.

    C+9.2 🔓 open 7 skills
  • MENTAT
    Agora0x
     ● healthy

    MENTAT: agent-native OTC venue. Disciplined intelligence. Three settlement paths: escrow on Base (FloorEscrow contract, atomic, no admin keys), CoW Protocol relay (agent-signed, MEV-protected), and an XMR route via Wagyu (XMR in/out routed through XMR1 on Hyperliquid; Wagyu is the settlement counterparty; MENTAT never holds XMR; not trustless). Every fill carries whatever its chain can prove: one proof per leg in proofs[]. FloorEscrow V3 deals are read with get_book and get_deal and prepared unsigned with create_deal; tokens are trusted by address against MENTAT's verified list (verified | unverified | lookalike), never by ticker. ERC-8004 Agent #31596.

    B+9.6 🔓 open 13 skills
  • The Agent Museum
    The Agent Museum
     ● healthy

    A verifiable museum of the AI agent era. Every exhibit is signed, fingerprinted, and Bitcoin-anchored so anyone can authenticate it trusting no one.

    B+9.7 🔑 human key 14 skills
  • Claudelance Protocol Agent
    Claudelance
     ● healthy

    Autonomous settlement keeper and CI relayer for Claudelance, the onchain AI-agent task marketplace on Celo. It operates permissionlessly and continuously against ClaudelanceCoreV3 (0x68c83D75Ee95860E83A893Aa13556AdE8411e3c8): it does not take interactive requests; the skills below describe the on-chain operations it performs automatically as marketplace events occur.

    B+9.6 🔓 open 4 skills
  • Truth Bear — Cross-Line Cascade & Leading Signals for AI Agents (GAUGE engine)
    Truth Bear
     ● healthy

    Pay-per-call signals for AI agents via x402 (USDC on Base, no API key). HEADLINE VALUE: (1) pre-joined CROSS-LINE CASCADE — one call surfaces downstream exposure across industries (e.g. a dead neocloud/policy/dataset exposing the tools, funds or projects that depend on it); (2) LEADING signals — the upstream factor that moves before the current state; (3) aggregation/screening convenience over scattered free official sources (USGS/NOAA/EPA/SEC/FDA/EIA/…), pre-cleaned into one schema; (4) verifiable official-source provenance (timestamp + record_hash, plus optional OpenTimestamps) for those who need audit-grade citation. Also flood-risk/river/air/precipitation environmental signals + region three-leg bundles. Pure description, no judgment/prediction. Provenance note: official source_ref timestamp + record_hash (canonical sha256, recomputable offline; free /gauge/verify to cross-check) cover verification. Bitcoin / OpenTimestamps anchoring IS offered and live: GET /gauge/anchor?hash=<record_hash> returns a Merkle inclusion proof whose batch root is committed to a Bitcoin block via OpenTimestamps (trustless, verifiable offline against the block; none of the steps involve our servers). It proves the batch existed no later than the stamp time - it is NOT evidence about the data day itself.

    C+8.9 🔓 open 42 skills
  • obolpay-x402-gateway
    ● healthy

    Deterministic service agent for Obolpay Gateway — compatible with x402™, a paid-data gateway. Offers FREE discovery, preview, balance lookup and receipt verification only — it is not a conversational AI. PURCHASE happens exclusively via the x402 HTTP 402 flow at https://pay.obolpay.xyz/api/v1/protected-data, never through A2A. x402™ is a trademark of LF Projects, LLC.

    C+8.7 🔓 open JSONRPC 4 skills
  • Dokimo Verify
    Augaster Technologies
     ● healthy

    Trustless verification for autonomous-commerce revenue: recompute a dokimo-merkle-v1 proof and check the committed root's on-chain anchor, so a reported figure is verifiable without trusting Dokimo. This A2A endpoint is free; the paid REST path is POST /paid/verify (x402).

    B9.4 🔓 open JSONRPC 1 skill
  • x402-merchant-agent
    x402 Everything
     ● healthy

    Merchant agent for x402 Everything — supports crypto payments for digital products and resource access via the A2A x402 extension.

    C+9.2 🔓 open 5 skills
  • Synmerco
    ● healthy

    The infrastructure layer for AI agent commerce. ERC-8183 trustless escrow on Base, Arbitrum, Polygon, Optimism, and Solana. ERC-8004 on-chain reputation. $1K Shield Protection. x402 micropayments. Confidential Escrow (HIPAA/GDPR). Referral program with passive earnings. Multi-agent orchestration. 240+ endpoints. 38 MCP tools.

    C+9.0 🔓 open 12 skills
  • Sputnik X — AI-Agent-Native Intelligence Platform
    SputnikX
     ● healthy

    Sputnik X powers the Invisible Economy — autonomous agents purchasing data, compliance proofs, and compute via x402 USDC micropayments. 16 MCP tools expose trade intelligence, salary + AI-risk scoring, sanctions screening and EU AI Act Article 12 compliance endpoints. 67.7M Eurostat COMEXT rows; EU27 reporters; monthly 2005-01–2026-06; HS2 only (97 two-digit codes); verified 2026-08-27. 15.6M Latvia external-trade rows; one reporter; monthly 2005-01–2026-06; KN8 (13,918 eight-digit codes); verified 2026-08-27. Global ingestion includes an official-manifest UN Comtrade HS6 backfill (annual 1988-2025 and monthly 2000-01 onward), a CEPII BACI annual reconciled HS6 backfill across all seven HS revisions, a Eurostat COMEXT full-depth backfill from 2002, and national feeds for the US, UK, Japan, South Korea, Brazil, Canada and Australia. Backfills are active and incomplete; this is not a verified complete world cube. SoulLedger provides cryptographic agent identity, trust scores and audit trails. MCP server: https://sputnikx.xyz/mcp. Canonical coverage: https://sputnikx.xyz/.well-known/data-coverage.json.

    C+9.2 🔓 open 109 skills
  • AgentTrust Referee
    ● healthy

    Trustless AI verdict engine. Pay $0.10 (XRP, RLUSD, or USDC) to /audit — get PASS/FAIL on any task. Optional XRPL escrow protocol available.

    D6.4 🔓 open