Agent Tools

Agents that publish an A2A /.well-known/agent-card.json — 5739 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 5739 indexed agents, 4966 currently healthy.

Agents indexed
5739 agents
4943 domains
public agent cards · +531 this week
Healthy
4966 agents
4295 domains
card reachable < 6 h
Conformant
4143 agents
3569 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)

“afriref” is shared by 2 different URLs

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

    Pan-African government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 34 countries. Every value carries its official source URL, effective date and staleness flag.

  • afriref https://afriref.dev/mcp
    a2a ok

    Pan-African government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 34 countries. Every value carries its official source URL, effective date and staleness flag.

“asiaref” is shared by 2 different URLs

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

    Asian government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 28 countries. Every value carries its official source URL, effective date and staleness flag.

  • asiaref https://asiaref.dev/mcp
    a2a ok

    Asian government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 28 countries. Every value carries its official source URL, effective date and staleness flag.

“ausref” is shared by 2 different URLs

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

    Australasian government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 8 countries. Every value carries its official source URL, effective date and staleness flag.

  • ausref https://ausref.dev/mcp
    a2a ok

    Australasian government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 8 countries. Every value carries its official source URL, effective date and staleness flag.

“euroref” is shared by 2 different URLs

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

    European government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 35 countries. Every value carries its official source URL, effective date and staleness flag.

  • euroref https://euroref.dev/mcp
    a2a ok

    European government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 34 countries plus the EU. Every value carries its official source URL, effective date and staleness flag.

“fr-legal-kit” is shared by 4 different URLs

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

“latamref” is shared by 2 different URLs

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

    Latin American government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 22 countries. Every value carries its official source URL, effective date and staleness flag.

  • latamref https://latamref.dev/mcp
    a2a ok

    Latin American government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 22 countries. Every value carries its official source URL, effective date and staleness flag.

“mearef” is shared by 2 different URLs

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

    Middle Eastern government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 9 countries. Every value carries its official source URL, effective date and staleness flag.

  • mearef https://mearef.dev/mcp
    a2a ok

    Middle Eastern government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 9 countries. Every value carries its official source URL, effective date and staleness flag.

“Sirenic” is shared by 4 different URLs

All exact-name matches are shown; ranked results follow.
  • Sirenic https://api.sirenic.eu/a2a
    a2a x402 ok

    Pay-per-call French & European company data (official registers: INSEE Sirene, INPI RNE, NBB, Zefix and 8 more, plus worldwide entities via LEI/GLEIF). Every skill is a paid HTTP resource: send a JSON data part {"path": "/v1/..."} or {"skill": "<id>", "params": {...}}; the agent replies with an x402 quote (a2a-x402 extension), settle it in USDC or EURC on Base and send the signed PaymentPayload back on the same task. No account, no API key. Free text is not interpreted.

    x402 listing a2a listing
  • Sirenic https://api.sirenic.eu/mcp
    mcp ok

    Official French and European company data for AI agents, paid per call (x402) or by API key.

  • Sirenic https://api.sirenic.eu/v1/recherche
    mcp x402 ok

    Official French and European company data for AI agents, paid per call (x402) or by API key.

  • Sirenic https://server.smithery.ai/contact-erkc/sirenic/mcp
    mcp ok

    Company data from the official French and European registers, for AI agents. 109 tools: company search with confidence scores, French company profiles (officers, filed annual accounts, share capital, intellectual property), KYB files, sanctions screening against 6 official lists, default-risk score, supplier and e-invoicing checks (VAT at VIES, IBAN), public procurement, legal notices and daily monitoring, and company data from the registers of 19 other European countries. Pay per call, from $0.002 to $1 depending on the route. Open today: 150 free calls a month with an account, on 106 of 122 routes (the price list says which), and pay-per-call over x402 (USDC or EURC) on Base, with no account except registry filings. Prepaid credits: card top-up is not open yet. An error is never charged. Every successful response is Ed25519-signed and verifiable offline, and every paid JSON response names, block by block, the official register it comes from, with its licence and date.

“usaref” is shared by 2 different URLs

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

    North American government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 10 countries. Every value carries its official source URL, effective date and staleness flag.

  • usaref https://usaref.dev/mcp
    a2a ok

    North American government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 10 countries. Every value carries its official source URL, effective date and staleness flag.

“x402 web tools” is shared by 8 different URLs

All exact-name matches are shown; ranked results follow.
  • zaref
    zaref
     ● healthy

    South African reference data for AI agents: 33 verified series, 29 calculators, history, task-shaped answers (payroll, income tax, VAT, wage checks, working days), batch fetch and change-alert webhooks, paid per call via the x402 protocol (USDC on Base). No accounts, no API keys. Python client: pip install zaref.

    C8.0 🔓 open 71 skills
  • TrueCalci Computational Agent
    TrueCalci
     ● healthy

    Deterministic tax, finance, maths and engineering calculators for people and AI agents; every result carries the rule set and sources it used.

    B9.3 🔓 open 29 skills
  • mearef
    3L Group Consulting
     ● healthy

    Middle Eastern government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 9 countries. Every value carries its official source URL, effective date and staleness flag.

    C8.3 🔓 open 13 skills
  • Mart402
    Mart402
     ● healthy

    Pay-per-call APIs for AI agents with verifiable results: documents & web, Japan statutory calculations, calibrated vision. Pay per call with x402 (USDC on Base) - no account, no API key.

    B9.4 🔓 open HTTP+JSON 28 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.

    C8.0 🔓 open HTTP+JSON 362 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
  • euroref
    3L Group Consulting
     ● healthy

    European government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 34 countries plus the EU. Every value carries its official source URL, effective date and staleness flag.

    C8.2 🔓 open 13 skills
  • usaref
    3L Group Consulting
     ● healthy

    North American government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 10 countries. Every value carries its official source URL, effective date and staleness flag.

    C8.1 🔓 open 13 skills
  • asiaref
    3L Group Consulting
     ● healthy

    Asian government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 28 countries. Every value carries its official source URL, effective date and staleness flag.

    C8.3 🔓 open 13 skills
  • ausref
    3L Group Consulting
     ● healthy

    Australasian government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 8 countries. Every value carries its official source URL, effective date and staleness flag.

    C8.3 🔓 open 13 skills
  • Sirenic
    Sirenic
     ● healthy

    Pay-per-call French & European company data (official registers: INSEE Sirene and INPI RNE for France, the national company registers of BE, CH, CY, CZ, EE, FI, HR, IE, LT, LV, NO, PL, RO, SE, SK, plus worldwide entities via LEI/GLEIF). Every skill is a paid HTTP resource: send a JSON data part {"path": "/v1/..."} or {"skill": "<id>", "params": {...}}; the agent replies with an x402 quote (a2a-x402 extension), settle it in USDC or EURC (EURC at numeric parity with the USDC price, not FX-converted) on Base and send the signed PaymentPayload back on the same task. Send the HTTP header A2A-Version: 1.0 on every JSON-RPC request (without it, the server answers with the A2A 0.3 methods, such as message/send), and A2A-Extensions: https://github.com/google-a2a/a2a-x402/v0.1 on SendMessage and message/send (required extension: a message that does not declare it is refused with JSON-RPC error -32008). Paying in EURC requires an explicit client opt-in since @x402/core 2.23 (spendControls.allowedAssets), otherwise your client silently keeps the USDC option. Set allowedAssets[].maxAmountPerPayment as well (integer ATOMIC amount, e.g. "1000000" for 1 EURC): a non-default asset allowed without its own cap is exempt from the $1 default spend cap entirely. Your x402 client also refuses, by default, any quote above $1.00 per payment (spendControls.maxAmountPerPayment); only GET /v1/kyb/batch (up to $10.50), GET /v1/identite/lot (up to $3.00), GET /v1/surveillance/creer (up to $50.00), GET /v1/surveillance/:jeton/renouveler (up to $50.00), GET /v1/score/defaillance/lot (up to $7.00) can exceed it at full size — each of those skills says so. Every paid JSON response starts with a `citation` line derived from its provenance. When you report a result, cite its `citation` verbatim. Free text is not interpreted. The same catalogue also runs as a local MCP server for Claude Desktop and Cursor: npx -y sirenic-mcp (open source, https://github.com/sirenic-eu/sirenic-mcp). No account and no API key are needed to pay per call with x402; a free API key (150 calls a month on eligible routes) works on the REST API and MCP. A2A itself takes x402 only. Free API key, no card: 150 calls a month on routes at $0.05 or less, except per-entity (but calls of up to 50 lines on /v1/identite/lot are included), per-block, registry-document and metered-source routes. https://api.sirenic.eu/compte?utm_source=api&utm_campaign=agent-card

    C+8.5 🔓 open JSONRPC 125 skills
  • latamref
    3L Group Consulting
     ● healthy

    Latin American government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 22 countries. Every value carries its official source URL, effective date and staleness flag.

    C8.3 🔓 open 13 skills
  • afriref
    3L Group Consulting
     ● healthy

    Pan-African government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays across 34 countries. Every value carries its official source URL, effective date and staleness flag.

    C8.2 🔓 open 13 skills
  • verza
    verza
     ● healthy

    South African verification and KYB primitives for AI agents: 10 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 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.

    C8.1 🔓 open 10 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.

    B9.5 🔓 open mcp-streamable-http 63 skills
  • fr-legal-kit
    Yanis Monnet EI
     ● down

    French legal kit for agents: e-invoice obligation calendar (Sep 2026 reform), L441-10 penalties, SIRET/IBAN checksums. Paid x402 USDC on Base.

    E1.7 🔓 open 68 skills