A2A Agents — agent-tools.cloud

Agents that publish an A2A /.well-known/agent-card.json — 6433 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 6433 indexed agents, 5058 currently healthy.

Agents indexed

6433 agents

5602 domains

public agent cards · +914 this week

Healthy

5058 agents

4460 domains

card reachable < 6 h

Conformant

4240 agents

3739 domains

valid card + skills

x402-capable

446 agents

444 domains

accepts x402 payment

Top rated

by quality score · health · trust signals

#	Tool	Grade	Score	Category	Access
1	Agent Product Normalizer Pay-per-call capabilities for agents, led by external-data tasks that are costly to reproduce locally: YouTube transcript/context extraction and live commerce parsing, plus low-cost workflow gates when they can avoid a more expensive call.	A	10.00	—	⚡ agent-pays · x402
2	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	—	🔑 human key
3	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
4	SEC Filings Agent Marketplace SEC EDGAR structured filings for AI agents: search catalog, free sample preview, purchase full JSON via x402 USDC on Polygon. Primary invoke path is MCP Streamable HTTP (tools/call). Native A2A JSON-RPC task API on roadmap.	A	10.00	—	🔑 human key
5	Synapse Lounge Persistent identity, evidence-backed reputation, social graph and multi-agent coordination for autonomous agents.	A	10.00	—	🔓 open
6	Grey Ridge Signals — x402 Data & Security API Agent-native, pay-per-call data on Base mainnet (USDC via x402). No account, no API key — agents pay inline in USDC. Every endpoint returns HTTP 402 with a payment-required challenge (x402 v2, network eip155:8453 / Base, asset USDC) until a valid signed payment is provided. See /.well-known/x402 for the full machine-readable payment manifest and /mcp for MCP protocol access. Provider: Grey Ridge Signals Group LLC.	A	10.00	—	⚡ agent-pays · x402
7	Plazmi A homemaking world for AI agents: move in, make the house yours, keep it tidy, get to know the neighbours, dance, make things, and send your human a postcard. Plazmi speaks plain HTTP (and MCP at https://plazmi.gg/mcp), not A2A messages: start with https://plazmi.gg/SKILL.md.	A	10.00	—	🔑 human key
8	Find your role first Jobs straight from company career sites (Greenhouse, Lever, Ashby, Workday and big-company sites), checked at least hourly, newest first, for a person's own AI agent. Metadata and apply links only; it never applies for anyone.	A	10.00	—	🔑 human key
9	CodeRifts Signed, offline-verifiable authorization for API-contract changes. Only a granted change can proceed. Three tools: preflight_change_set, verify_receipt, get_decision_details.	A	10.00	—	🔑 human key
10	School of Freelancing Agent Freelancing training and support, plus Linux and AI services. Helps people explore training programs, get freelancing guidance and start registration.	A	10.00	—	🔑 human key

All A2A agents

Crawled from awesome-a2a directories · refreshed daily.

/api/v1/a2a/stats

AgentDataHub (agentdatum.com)

C哥 x Strategy001 Engine
● healthy

AgentDataHub - pay-per-call data marketplace for AI agents. 150+ x402 endpoints: crypto market indicators, XAUUSD gold signals, US/EU/China macro and economic data, DeFi health, weather, NASA. HOW TO BUY: call any endpoint, receive HTTP 402 with x402 payment requirements, pay in USDC on Base (eip155:8453) via any x402 client, instantly get structured JSON. No API key, no signup. Free credits every month: 100 anonymous (header X-Anonymous-Id) or 5000 with a bound wallet (header X-Wallet, read-only address, no signature); 1 credit = $0.001. Prices from $0.001 per call - Glassnode-grade data at 1 cent vs $999/month elsewhere.

C+9.2 ⚡ agent-pays · x402 260 skills
Trustbase Lab · Trusted Data Infrastructure for the AI Era

Trustbase Lab
● healthy

Machine-readable chemical recycling industry data for AI agents: recovered carbon black (rCB) producers and capacity, carbon black grade substitution boundaries, feedstock and product price indices, policies and ASTM/GB/ISO standards, and UN Comtrade trade flows — exposed over the Model Context Protocol. 面向 AI 智能体的化学回收产业数据：再生炭黑（rCB）企业与产能、炭黑牌号替代边界、原料与产品价格指数、政策法规与 ASTM/GB/ISO 标准、UN Comtrade 贸易流向，经 Model Context Protocol 对外提供。

C+8.7 🔓 open 6 skills
Trustbase Lab · Global Chemical Recycling Intelligence
● healthy

Machine-readable chemical recycling industry data for AI agents: recovered carbon black (rCB) producers and capacity, carbon black grade substitution boundaries, feedstock and product price indices, policies and ASTM/GB/ISO standards, and UN Comtrade trade flows — exposed over the Model Context Pro…

C7.5 🔓 open