Agent Tools

Agents that publish an A2A /.well-known/agent-card.json — 5767 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 5767 indexed agents, 4819 currently healthy.

Agents indexed
5767 agents
4971 domains
public agent cards · +443 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)

“HALOWERK netzwerk” is shared by 2 different URLs

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

“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.

“Whisper” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.
  • Whisper https://whisper.online
    a2a ok

    Give an AI agent a stable, routable IPv6 address of its own and egress that anyone can verify from outside. Use this when you need a fixed IP your traffic actually leaves from, an identity another service can check independently by reverse DNS and RDAP rather than taking your word for it, or contro…

  • Whisper https://whisper.online/a2a
    a2a ok

    Give an AI agent a stable, routable IPv6 address of its own and egress that anyone can verify from outside. Use this when you need a fixed IP your traffic actually leaves from, an identity another service can check independently by reverse DNS and RDAP rather than taking your word for it, or control over what an agent is allowed to reach and a record of what it did. It also answers security questions about any domain, address or file hash from the Whisper graph, with no account at all. The address space is AS219419, which we run; an email address alone is enough to get a key.

  • Whisper https://whisper.online/mcp
    mcp ok

    One routable IPv6 per AI agent, verifiable from the DNS root. Keyless tools need no signup.

“x402 web tools” is shared by 8 different URLs

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

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

    C+9.0 🔓 open JSONRPC 10 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.

    C8.2 🔓 open 3 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
  • Whisper
    Whisper Security
     ● healthy

    Give an AI agent a stable, routable IPv6 address of its own and egress that anyone can verify from outside. Use this when you need a fixed IP your traffic actually leaves from, an identity another service can check independently by reverse DNS and RDAP rather than taking your word for it, or control over what an agent is allowed to reach and a record of what it did. It also answers security questions about any domain, address or file hash from the Whisper graph, with no account at all. The address space is AS219419, which we run; an email address alone is enough to get a key.

    C+9.0 🔑 human key 37 skills