A2A Agents — agent-tools.cloud

Agents that publish an A2A /.well-known/agent-card.json — 6415 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 6415 indexed agents, 5600 currently healthy.

Agents indexed

6415 agents

5591 domains

public agent cards · +770 this week

Healthy

5600 agents

4921 domains

card reachable < 6 h

Conformant

4712 agents

4128 domains

valid card + skills

x402-capable

522 agents

431 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

“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.

“FieldPulse” is shared by 2 different URLs

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

FieldPulse https://fieldpulse.theaslangroupllc.com

a2a ok

Global precision agriculture intelligence API. Synthesizes satellite NDVI, MET Norway weather forecasts, NASA POWER soil and climate data, USDA WASDE, FAO, and EPPO into actionable intelligence for growers, traders, agronomists, and AI agents. 10 endpoints covering crop health, yield forecasting, weather risk, soil intelligence, pest/disease alerts, irrigation scheduling, commodity outlook, input costs, planting windows, and seasonal briefs. Pay-per-query via x402 USDC micropayments on Base mainnet. Covers any crop at any lat/lon globally — wheat, corn, rice, soybeans, coffee, cocoa, cotton, palm oil, sugarcane, cassava, a
FieldPulse https://fieldpulse.theaslangroupllc.com/api/crop-health

x402 ok

Global precision agriculture intelligence API. Synthesizes satellite NDVI, MET Norway weather forecasts, NASA POWER soil and climate data, USDA WASDE, FAO, and EPPO into actionable intelligence for growers, traders, agronomists, and AI agents. 10 endpoints covering crop health, yield forecasting, weather risk, soil intelligence, pest/disease alerts, irrigation scheduling, commodity outlook, input costs, planting windows, and seasonal briefs. Pay-per-query via x402 USDC micropayments on Base mainnet. Covers any crop at any lat/lon globally — wheat, corn, rice, soybeans, coffee, cocoa, cotton, palm oil, sugarcane, cassava, a

“HALOWERK spacewerk” is shared by 2 different URLs

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

HALOWERK spacewerk https://space.halowerk.com

a2a ok

HALOWERK spacewerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK spacewerk https://space.halowerk.com/v1/satellite-pass

x402 ok

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

“Innovalyxx Sovereign Edge” is shared by 3 different URLs

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

Innovalyxx Sovereign Edge https://edge.innovalyxx.com/mcp

a2a mcp ok

Verified cyber-physical AI tools. 25 MCP tools, x402-payable on Base.

mcp listing a2a listing
Innovalyxx Sovereign Edge https://edge.innovalyxx.com/mcp/tools/generate_tevv_report

mcp x402 ok

Verified cyber-physical AI tools for autonomous agents. Pay per call via x402 (USDC on Base). 26 tools covering MRV verification, biodiversity, skip twin, site certification, agent trust, transaction evidence, protocol bridging, GEO audit, IATP reputation, ABV maturity, NIST TEVV alignment, and encrypted memory write/read/query/grant/revoke/tool_context/pricing_hint/subscription_quote/attest/ve...
Innovalyxx Sovereign Edge https://edge.innovalyxx.com/mcp/tools/request_mrv_report

mcp x402 ok

Verified cyber-physical AI tools. 25 MCP tools, x402-payable on Base.

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.

C+9.2 ⚡ agent-pays · x402 66 skills
Coin Railz

Coin Railz
● healthy

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

A9.8 🔓 open JSONRPC 80 skills
HALOWERK spacewerk
● healthy

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

C+9.1 🔓 open JSONRPC 10 skills
FieldPulse

The Aslan Group LLC
● healthy

Global precision agriculture intelligence API. Synthesizes satellite NDVI, MET Norway weather forecasts, NASA POWER soil and climate data, USDA WASDE, FAO, and EPPO into actionable intelligence for growers, traders, agronomists, and AI agents. 10 endpoints covering crop health, yield forecasting, weather risk, soil intelligence, pest/disease alerts, irrigation scheduling, commodity outlook, input costs, planting windows, and seasonal briefs. Pay-per-query via x402 USDC micropayments on Base mainnet. Covers any crop at any lat/lon globally — wheat, corn, rice, soybeans, coffee, cocoa, cotton, palm oil, sugarcane, cassava, a

B+9.6 🔓 open HTTP+JSON 11 skills
Waltsoft SitePulse

Waltsoft
● healthy

Sentinel-2 satellite change detection API. Detects construction activity, deforestation and land use change at any coordinate worldwide — returns change verdict, NDVI/NDBI deltas, confidence level and per-scene evidence at 10 m resolution. Not reliable for single-family homes.

B9.2 🔓 open JSONRPC 2 skills
Innovalyxx Sovereign Edge

Innovalyxx AI
● healthy

Neutral physical-verification and Trust Verification agent. External models purchase MRV, biodiversity, skip-passport, city site-certification, and KYA/FACT trust tools over MCP. Every high-stakes result is accompanied by fact.runtime_attestation.v1 and lean4_proof_hash.

C+8.9 🔓 open 26 skills