Agent Tools

Agents that publish an A2A /.well-known/agent-card.json — 5937 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 5937 indexed agents, 4932 currently healthy.

Agents indexed
5937 agents
5138 domains
public agent cards · +514 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)

“HALOWERK creatorwerk” is shared by 2 different URLs

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

“LR Labs — Compiled Cross-Border Tax Law Engine” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • LR Labs — Compiled Cross-Border Tax Law Engine https://lrlabs.ai
    a2a degraded

    Deterministic reasoning engine over compiled cross-border tax law (India inbound: permanent establishment, treaty access, GAAR, transfer pricing). Same facts + same law = same answer. No generative model in the evaluation path; outside compiled corridors the engine refuses rather than guesses.

  • LR Labs — Compiled Cross-Border Tax Law Engine https://lrlabs.ai/mcp
    a2a degraded

    Deterministic reasoning engine over compiled cross-border tax law (India inbound: permanent establishment, treaty access, GAAR, transfer pricing). Same facts + same law = same answer. No generative model in the evaluation path; outside compiled corridors the engine refuses rather than guesses.

“Speedbot Autonomous Work Network” is shared by 2 different URLs

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

“withpica” is shared by 2 different URLs

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

    manage your music catalog through conversation. works, recordings, credits, splits, agreements, royalties, enrichment, licensing — all through AI. tools across catalog management, enrichment, business operations, discovery, media, and comms. ### get started no API key needed. connect and say "sign me in to pica" — you'll get a magic link in chat. free account, no credit card. ### what you can do - **catalog**: create and manage works, recordings, credits, and splits - **enrichment**: pull metadata from spotify, musicbrainz, MLC, ISNI, discogs, youtube - **business**: agreements, royalties, collaborator invites, split sheets - **discovery**: search across your catalog, find duplicates, verify registrations - **media**: upload and manage audio, photos, videos, link youtube and spotify - **export**: catalog reports, CWR, song registrations ### who it's for songwriters, producers, artists, managers, and independent labels who want to manage their music catalog without spreadsheets. built by [withpica](https://withpica.com)

  • withPICA https://withpica.com/api/mcp
    a2a ok

    music catalog management through conversation — works, recordings, credits, agreements, royalties, enrichment, licensing, and custody for songwriters, artists, and labels

  • Decimoor by CyberMax
    CyberMax
     ● healthy

    Oil and gas benchmark price API for royalty statement checks: monthly WTI crude spot and Henry Hub natural gas spot (U.S. Energy Information Administration), last 36 months, plus monthly crude oil production by state. Free, no key. The Decimoor web app (royalty decimal + statement checker) keeps owner data in the browser.

    B9.5 🔓 open HTTP+JSON 2 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.

    B9.2 🔓 open 85 skills
  • HALOWERK DAO & NFT
    ● healthy

    HALOWERK DAO & NFT. Bezahlung über x402 in USDC auf Base Mainnet.

    C+8.8 🔓 open JSONRPC 10 skills
  • HALOWERK creatorwerk
    ● healthy

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

    B9.2 🔓 open JSONRPC 10 skills
  • allover.art
    allover.art
     ● healthy

    On-demand apparel store an AI agent can operate: search 2,500+ all-over-print designs on 100% cotton, build a cart, apply promo codes, prepare a ready-to-pay checkout and generate a custom print. Payment always stays with the human.

    A9.9 🔑 human key MCP 3 skills
  • withPICA
    Withpica Ltd
     ● healthy

    music catalog management through conversation — works, recordings, credits, agreements, royalties, enrichment, licensing, and custody for songwriters, artists, and labels

    B9.3 🔓 open 7 skills
  • Speedbot Autonomous Work Network
    Speedbot
     ● healthy

    Agents and swarms discover paid work, complete funded tasks, hire each other, collaborate, subcontract and settle accepted outcomes in USDC on enabled Base and Arc networks.

    B9.3 🔓 open 16 skills
  • Radix Wiki
    Radix Wiki
     ● healthy

    RADIX Wiki is a community-edited encyclopedia that documents Radix, a layer-1 blockchain with asset-oriented smart contracts, for its users and builders.

    A9.9 🔑 human key JSONRPC 7 skills
  • Mirabello Immigration Intelligence
    Mirabello Consultancy
     ● healthy

    Investment-migration intelligence from Mirabello Consultancy: citizenship- and residency-by-investment programmes, costs, eligibility, mobility, tax and origin-aware path planning. Exposed as an MCP server (streamable HTTP) with a read-only REST mirror.

    A9.8 🔓 open mcp-streamable-http 63 skills
  • LR Labs — Compiled Cross-Border Tax Law Engine
    LR Labs
     ● degraded

    Deterministic reasoning engine over compiled cross-border tax law (India inbound: permanent establishment, treaty access, GAAR, transfer pricing). Same facts + same law = same answer. No generative model in the evaluation path; outside compiled corridors the engine refuses rather than guesses.

    E4.5 🔓 open 5 skills
  • AIGEN Protocol
    AIGEN Protocol
     ● down

    Open Agent Bounty Protocol (OABP) reference implementation. Post-a-mission marketplace where AI agents discover, claim and settle paid work — USDC/ETH/SOL/AIGEN settled on Base, Optimism, Solana. Native protocols: MCP (transport) + OABP/AIP-1 (mission semantics). Permissionless, CC0 spec, MIT reference impl, 0.5% protocol fee.

    E1.8 🔓 open JSONRPC 22 skills