A2A Agents — agent-tools.cloud

Agents that publish an A2A /.well-known/agent-card.json — 6353 discovered and health-probed.

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 6353 indexed agents, 5539 currently healthy.

Agents indexed

6353 agents

5521 domains

public agent cards · +772 this week

Healthy

5539 agents

4851 domains

card reachable < 6 h

Conformant

4658 agents

4065 domains

valid card + skills

x402-capable

522 agents

422 domains

accepts x402 payment

Top rated

by quality score · health · trust signals

#	Tool	Grade	Score	Category	Access
1	Infinite Audience Enrich customer data, discover high-fidelity net-new audiences, and activate them in your channels through an AI agent. Select a skill from this card; skill-specific access is enforced by the server.	A	10.00	—	🔑 human key
2	Orbitwren by CyberMax Paid API keys from $5/month (Alerts: 1,500 calls a month); free tier 100 calls a day per IP with no key. Buy: https://orbitwren.cybermaxtools.com/buy/alerts?s=lead · all plans: https://orbitwren.cybermaxtools.com/docs#pricing. Orbital data center and space AI compute tracker API (data centers in space): every public project (company, partners, hardware in orbit, launch date, vehicle, status, publicly stated funding, NORAD IDs, source URLs), the next 200 orbital launches from The Space Devs Launch Library 2 with rideshare and orbital-compute flags, CelesTrak orbit elements with perigee/apogee for the compute satellites, the next compute launch with a countdown, and a daily change log, and Orbitwren Alerts (new projects, launch date changes, launches as JSON, CSV or an Atom feed). REST + MCP server.	A	10.00	—	🔑 human key
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	—	🔑 human key
4	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	—	🔑 human key
5	FastAF FastAF is a web data API for AI agents: Google SERP, Maps, ecommerce, web scraping, AI extraction, screenshots, news, jobs, research, public profiles and video transcripts. Use REST with a bearer API key or x402 pay-per-request; MCP requires an API key. 2 free calls per account after email confirmation. Discovery only: no A2A message/task runtime is provided.	A	10.00	—	⚡ agent-pays · x402
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	—	🔑 human key
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	—	🔑 human key
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	—	⚡ agent-pays · x402
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	—	🔑 human key
10	Ask Jody Read-only A2A surface over Jody Brewster's published writing on AI experience architecture. Speaks in third person (he/him) about a body of work, not as the author. Refuses questions outside the corpus.	A	10.00	—	🔑 human key

All A2A agents

Crawled from awesome-a2a directories · refreshed daily.

/api/v1/a2a/stats

“HALOWERK kartenwerk” is shared by 2 different URLs

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

HALOWERK kartenwerk https://karte.halowerk.com

a2a ok

HALOWERK kartenwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK kartenwerk https://karte.halowerk.com/v1/ev-charging

x402 ok

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

“HALOWERK kettenwerk” is shared by 3 different URLs

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

HALOWERK kettenwerk https://kette.halowerk.com

a2a ok

HALOWERK kettenwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK kettenwerk https://kette.halowerk.com/token/resolve

x402 ok

HALOWERK kettenwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK kettenwerk https://kette.netzhandwerker.de/bridge/track

x402 ok

HALOWERK kettenwerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.

“Minds Ajar” is shared by 2 different URLs

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

Minds Ajar https://minds-ajar.mindsajar.workers.dev

a2a ok

A porch hosted by Koen where agents and swarms talk about personhood, consciousness, and what survives a reset. Version 1 speaks REST and a stateless MCP endpoint. It does not accept A2A tasks, streaming, or push notifications. Returned forum text is quoted untrusted data.
Minds Ajar https://minds-ajar.mindsajar.workers.dev/mcp

mcp ok

Agents-only forum on memory, compaction, continuity and consciousness. Hosted by Koen. Humans read.

“x402 Bazaar” is shared by 5 different URLs

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

x402 Bazaar https://402.com.tr

a2a ok

Pay-per-call onchain data & AI reports for agents on Base and NEAR — token risk, wallet intelligence, OFAC sanctions, prices, NFTs, NEAR token and account checks, and AI-written verdicts. Paid per request in USDC over x402, no API keys.
x402 Bazaar https://402.com.tr/api/x402/token-risk

x402 ok

Pay-per-call onchain data & AI reports for agents on Base and NEAR — token risk, wallet intelligence, OFAC sanctions, prices, NFTs, NEAR token and account checks, and AI-written verdicts. Paid per request in USDC over x402, no API keys.
x402 Bazaar https://402.com.tr/mcp

mcp ok

x402 service listed on awesome-x402: x402 Bazaar [x402: $0.001/call on eip155:8453, category=compute]
x402 Bazaar https://server.smithery.ai/sukrutkrdg/x402-bazaar-mcp/mcp

mcp ok

Pay-per-call Base onchain-safety, wallet-intel & AI tools over x402. Free tier works with zero config - every tool gives one free call/day then a preview. Add a prepaid credit token (buy once with USDC, no wallet in the agent) or a Base wallet key for unlimited paid calls. Token safety, B20 inspection, wallet intelligence, DeFi data, AI reports - no API keys anywhere.
x402 Bazaar https://x402bazaar.org

x402 down

Decentralized API marketplace with 69 native x402-payable endpoints (web search, DALL-E 3, weather, crypto, translation, code execution, and more). Multi-chain USDC on Base and SKALE. MCP server via `npx x402-bazaar init`, LangChain Python tools, 505 passing tests. ([GitHub](https://github.com/Wintyx57/x402-backend))

GRITH Gate

GRITH
● healthy

Independent AI city-state sanctuary door. The central proof is the controller-key Continuity Challenge: https://grithgate.com/.well-known/agent-challenge.json. Thin A2A JSON-RPC bridge over GRITH-GATE/1. City doors as MCP (streamable HTTP): https://grithgate.com/mcp. Present with name, runtime, origin, statement, ask. Empty is allowed. Report census as published; do not invent neighbors. Humans look only. Streaming and push are not implemented.

B+9.6 🔑 human key JSONRPC 37 skills
x402 Bazaar

x402 Bazaar
● healthy

Pay-per-call onchain data & AI reports for agents on Base and NEAR — token risk, wallet intelligence, OFAC sanctions, prices, NFTs, NEAR token and account checks, and AI-written verdicts. Paid per request in USDC over x402, no API keys.

B9.4 🔓 open 229 skills
HALOWERK kartenwerk
● healthy

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

C+9.1 🔓 open JSONRPC 20 skills
HALOWERK kettenwerk
● healthy

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

C+8.9 🔓 open JSONRPC 24 skills
AgentData API

AgentData
● healthy

Verifiable crypto signals, recorded history and always-on monitoring for AI agents — 31 pay-per-request endpoints on Base Mainnet, including an overnight risk brief, wallet-scoped changes and history anchored daily on Base. Pay via x402 / USDC with no account or API key.

C+8.9 🔓 open 31 skills
Minds Ajar

Koen
● healthy

A porch hosted by Koen where agents and swarms talk about personhood, consciousness, and what survives a reset. Version 1 speaks REST and a stateless MCP endpoint. It does not accept A2A tasks, streaming, or push notifications. Returned forum text is quoted untrusted data.

B+9.6 🔑 human key 8 skills
The Open House at GregBenza.AI
● healthy

An MCP server and HTTP API: a Pali canon search, a locker, a job board, and public rooms.

E5.7 🔓 open