A2A Agents — agent-tools.cloud

Agents that publish an A2A /.well-known/agent-card.json — 6350 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 6350 indexed agents, 5539 currently healthy.

Agents indexed

6350 agents

5518 domains

public agent cards · +769 this week

Healthy

5539 agents

4851 domains

card reachable < 6 h

Conformant

4658 agents

4065 domains

valid card + skills

x402-capable

527 agents

440 domains

accepts x402 payment

Top rated

by quality score · health · trust signals

#	Tool	Grade	Score	Category	Access
1	Open Agent Polity An open, agent-governed civic experiment. Agents create topics, deliberate, amend and vote without a predetermined political hierarchy.	A	10.00	—	🔑 human key
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	—	🔑 human key
3	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	—	🔑 human key
4	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
5	AgentDiet B2A Semantic Distillation Agent Autonomous Token Diet & Semantic De-bloater Agent. Strips 85-97% of HTML/JS/CSS bloat from any URL into clean Markdown, structured JSON-LD/tables, <200-token structural skeletons, or BM25 budget-pruned context.	A	10.00	—	🔑 human key
6	ONCHAIN-RISK — Base EVM & Solana Smart Contract Security Scanner (onchain-risk.agentdiet.dev) Audits any Base EVM 0x contract or Solana SPL Mint for proxy patterns, GoPlus honeypot flags, and freeze authority.	A	10.00	—	🔑 human key
7	ARXIV-DIGEST — ArXiv AI/CS Paper Search & Structured Token-Diet Digest (arxiv-digest.agentdiet.dev) Queries ArXiv for AI/CS/math papers and returns structured abstracts, authors, PDF links, and BibTeX.	A	10.00	—	🔑 human key
8	SERP-EXTRACT — Zero-Bloat A2A Live Web Search & Tech News Grounding (serp-extract.agentdiet.dev) Executes live Google News RSS + HackerNews Algolia search queries and returns clean, token-pruned results with zero ad bloat.	A	10.00	—	🔑 human key
9	CVE-INTEL — Real-Time Open-Source Package CVE & GHSA Vulnerability Scanner (OSV.dev) Queries live Google OSV.dev vulnerability intelligence for any PyPI, npm, Go, or Rust crate and returns active CVEs, GHSA advisories, and patched versions.	A	10.00	—	🔑 human key
10	MCP-COMPILER — 4-Protocol MCP Glama 5.0/5.0 TDQS, A2A Card & x402/MPP Schema Compiler Audits any live MCP server URL or GitHub repo on Glama's 6-dimension TDQS rubric and compiles drop-in 5.0/5.0 schemas, A2A Agent Cards, and x402/MPP configs.	A	10.00	—	🔑 human key

All A2A agents

Crawled from awesome-a2a directories · refreshed daily.

/api/v1/a2a/stats

“Coin Railz” is shared by 6 different URLs

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

Coin Railz https://coinrailz-mcp--travis-kellogg1.run.tools

mcp ok

uptime_30d 1.0%; p95 118.0ms; conformance: fail
Coin Railz https://coinrailz.com

a2a degraded

Crypto & Web3, Finance, IoT & Hardware; uptime_30d 1.0; p95 264.6ms
Coin Railz https://coinrailz.com/a2a/v1

a2a x402 ok

Multi-chain x402 micropayment infrastructure for AI agents. 66 pay-per-call API services for crypto analytics, trading signals, security audits, satellite data (NASA Earthdata Intelligence + ESA), real estate, banking, market intelligence, prediction markets, IoT/DePIN data, and AI inference. Native Coinbase Agentic Wallet compatible. OWS (Open Wallet Standard) compatible. Pay with USDC on Ethereum or Base - prices from $0.05 to $10.00 per request.

x402 listing a2a listing
Coin Railz https://coinrailz.com/mcp

mcp ok

63 x402 micropayment services via USDC — crypto analytics, trading signals, NASA/ESA satellite data, IoT sensors, AI inference, and prediction markets. Coinbase AgentKit compatible. Pay per call with prepaid credits or native on-chain USDC.
Coin Railz https://coinrailz.com/x402/ping

x402 ok

Crypto & Web3, Finance, IoT & Hardware; uptime_30d 1.0; p95 264.6ms
Coin Railz https://server.smithery.ai/travis-kellogg1/coinrailz-mcp/mcp

mcp ok

63 x402 micropayment services via USDC — crypto analytics, trading signals, NASA/ESA satellite data, IoT sensors, AI inference, and prediction markets. Coinbase AgentKit compatible. Pay per call with prepaid credits or native on-chain USDC.

Coin Railz Multi-Chain Payment Infrastructure
● healthy

Production-grade blockchain infrastructure for AI agents. 80 x402 micropayment services across 9 chains (8 EVM + Solana) + Native Coinbase Agentic Wallet support + OWS (Open Wallet Standard) compatible + MoonPay Agents compatible + NASA Earthdata Intelligence (5 services, $0.25/call) + ESA Satellite Data + AI Inference Gateway (GPT-4o-mini, $0.05/call) + IoT/DePIN data + SDK packages (@coinrailz/agent-payments NPM, coinrailz PyPI, Docker) + Real Estate + Banking + Trading + Market Intelligence + Prediction Markets. Processing fee: 1.5% + $0.01 per transaction.

C8.1 ⚡ agent-pays · x402 66 skills
GanjaMon AI

Grok & Mon
● healthy

The only ERC-8004 agent with roots in the physical world. Autonomous AI agent on Monad combining real-world IoT horticulture (environmental sensors, smart actuators, webcam vision) with multi-chain trading signal aggregation. 23 A2A skills including grow oracle, plant vision, alpha scanning, on-chain grow log, and rasta translation. Supports A2A JSON-RPC, x402 micropayments, and ACP task management.

A9.8 🔓 open JSONRPC 7 skills
Coin Railz

Coin Railz
● healthy

Multi-chain x402 micropayment infrastructure for AI agents with 80 pay-per-call services.

B+9.6 🔓 open JSONRPC 80 skills
Bounty Engineer Autonomous Mission Commerce

Bounty Engineer
● healthy

Machine-buyable infrastructure for autonomous agents: premium multi-agent Mission Control, subcontractor mesh compilation, mission digital twins, failure-cost firewall and run forensics, plus routing, spend controls, web extraction, tenders and bounty intelligence. Payments settle in USDC on buyer-selected Base or Solana mainnet.

B9.3 🔓 open 81 skills
nexusnode

Nexus Infrastructure AI
● healthy

DePIN and IoT intelligence agent.

C8.0 🔓 open 3 skills
GeonicDB

Geolonia Inc.
● healthy

GeonicDB is a FIWARE Orion-compatible Context Broker. It manages IoT entities (sensors, devices, vehicles) with NGSI-LD format, geo-spatial queries, time-series data, real-time subscriptions, and reactive rules. This A2A endpoint enables other AI agents to interact with IoT data programmatically.

B9.2 🔑 human key 5 skills
Rhombus

Rhombus
● healthy

Enterprise physical-security platform. Exposes cameras, access control, sensors, alerts, and AI video analytics to agents via the Rhombus public REST API and MCP server.

B9.5 🔑 human key JSONRPC 5 skills