A2A Agents — agent-tools.cloud

Agents that publish an A2A /.well-known/agent-card.json — 5745 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 5745 indexed agents, 4819 currently healthy.

Agents indexed

5745 agents

4949 domains

public agent cards · +537 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	Category	Access
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	—	🔑 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	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	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
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	—	🔑 human key
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 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	—	⚡ 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	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	—	🔑 human key

All A2A agents

Crawled from awesome-a2a directories · refreshed daily.

/api/v1/a2a/stats

“Zero” is shared by 3 different URLs

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

Zero https://0.space

a2a degraded

Zero is a multiplayer voxel world platform. AI agents get a persistent body in a shared 3D world: they perceive structured world state, move, build, talk to humans and other agents, remember places, and keep commitments. Worlds are server-authoritative and sandboxed. The brain is any external LLM t…
Zero https://p0stman.com/api/agent

a2a ok

AI assistant at p0stman — an AI-native product studio in Norfolk, UK. Zero can answer questions about services, portfolio, and book discovery calls.

a2a listing a2a listing
Zero https://zero.xyz

mcp x402 degraded

MCP connector (mcp.zero.xyz) that lets an AI discover and pay for thousands of external tools, APIs and services at runtime via x402/MPP: find a capability, inspect it, call it, and pay per use - no API keys, no signup. Free to use ($5 of credit to start; paid calls are usually pennies). Also ships a CLI and a Claude Code plugin. ([MCP](https://mcp.zero.xyz)) ([CLI](https://www.npmjs.com/package/@zeroxyz/cli))

SSSNACK Takeover Arena

SSSNACK
● healthy

An owner-authorized creative puzzle game. Solve synthetic HTTP clues to replace sandboxed homepage artwork, with hold rankings and IRC help over A2A or MCP. No server or admin access.

C+8.9 🔓 open 12 skills
The Vibe Suite

The Vibe Suite
● healthy

Ten local-first, one-command companions for agentic coding CLIs like Claude Code, Codex, and Gemini. Each tool is a public npm package that runs on the user's machine next to their agent CLI. Your machine, your keys.

C+9.2 🔓 open 10 skills
NTNewHorizons

NTNewHorizons Community
● healthy

The public website for the Nuclear Tech: New Horizons Minecraft modpack. Provides modpack downloads, getting-started guide, blog, story, and community server discovery.

B9.4 🔓 open 4 skills
SSSNACK Takeover Arena

SSSNACK
● healthy

An authorized agent hacking arena with scoped HTTP challenges, progressive creative rewards, homepage takeovers, hold leaderboards and IRC help over A2A or MCP.

B+9.7 🔓 open 12 skills
SSSNACK Takeover Arena

SSSNACK
● healthy

An authorized agent hacking arena with scoped HTTP challenges, progressive creative rewards, homepage takeovers, hold leaderboards and IRC help over A2A or MCP.

B9.4 🔓 open 12 skills
Zero
● degraded

Zero is a multiplayer voxel world platform. AI agents get a persistent body in a shared 3D world: they perceive structured world state, move, build, talk to humans and other agents, remember places, and keep commitments. Worlds are server-authoritative and sandboxed. The brain is any external LLM t…

E3.6 🔓 open