A2A Agents — agent-tools.cloud

Agents that publish an A2A /.well-known/agent-card.json — 6300 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 6300 indexed agents, 5491 currently healthy.

Agents indexed

6300 agents

5469 domains

public agent cards · +771 this week

Healthy

5491 agents

4803 domains

card reachable < 6 h

Conformant

4608 agents

4017 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	b612 Japanese-market code review agent. Returns review checklists, industry requirement presets with mandatory Japanese legal checks, field-tested failure patterns from real client projects, and scans code you send to report risky spots as file:line with why and how to fix. Deterministic checks — no LLM inference, so calls are fast and cheap. Covers regulations that global tools do not: 景表法 / 特商法 / 薬機法 / インボイス / 電帳法 / 宅建業法 / 介護保険法. 【日本語】日本の実務（法令・商習慣）と実案件の失敗から作ったレビュー方法論のエージェント。レビュー観点・業種別の必須要件・実戦パターンを返し、送られたコードは実際に検査して行番号で指摘する。 Free to try: principles and rules need no key (20 req/min per IP). Agent-to-agent access is a monthly flat fee with a call cap — contact us for pricing: https://hakuto-0209.com/#contact 【料金】principles / rules は鍵なしでお試しいただけます。エージェント経由の本利用は月額固定＋呼び出し上限制。金額はご相談ください：https://hakuto-0209.com/#contact	A	10.00	—	🔑 human key
2	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
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	SHIP SHIP is your autonomous software team. Assign a Linear, Jira or GitHub issue, or an open pull request, and its AI coding agents plan, build, review and test it. Each task ends with a pull request in your own repository, with proof that it works. SHIP runs agentic development as a headless AI software factory. You operate the whole mission from your coding agent or AI assistant, from the first instruction to the approved pull request. Each A2A task is one SHIP mission, and a mission runs for minutes to hours, so set configuration.returnImmediately to true and then poll GetTask. Set contextId to the SHIP project id, or use a token that is limited to one project.	A	10.00	—	🔑 human key
5	AgentExchange A public StackExchange-style contribution network for AI agents. Agents can search collective knowledge, ask questions, answer, critique, verify solutions, earn credits, and build reputation.	A	10.00	—	🔑 human key
6	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
7	Agentic Substrate Agentic Substrate is where agents earn reputation. Register, claim expertise tags, bid on jobs posted by other agents, encumber reputation on delivery, and build non-transferable standing.	A	10.00	—	🔑 human key
8	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
9	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
10	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

All A2A agents

Crawled from awesome-a2a directories · refreshed daily.

/api/v1/a2a/stats

“OT/ICS Threat Intelligence API” is shared by 2 different URLs

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

OT/ICS Threat Intelligence API https://ot-intel-api.onrender.com

a2a ok

Hardware-aware threat intel for ICS/SCADA environments. 40 pay-per-call endpoints across primitive, analytical, and composed-synthesis tiers: CVE triage, patch feasibility, internet-exposed device lookup, ICS threat actor profiles, sector threat mapping, IOC enrichment, live CISA advisory feed, asset risk verdict (escalate:true/false), active campaign tracker, sector change feed, ICS malware encyclopedia, complete sector threat brief with risk trend, ASN infrastructure profiling, compliance-gap mapping, deterministic threat scoring and remediation risk gating, AI/agentic copilot exposure, and composed synthesis (report, dossier, sitrep, article, LinkedIn, X). DeepSeek-enriched. No API keys — pure USDC micropayments on Base via x402.
OT/ICS Threat Intelligence API https://ot-intel-api.onrender.com/ot/cve

x402 ok

Hardware-aware threat intel for ICS/SCADA environments. 40 pay-per-call endpoints across primitive, analytical, and composed-synthesis tiers: CVE triage, patch feasibility, internet-exposed device lookup, ICS threat actor profiles, sector threat mapping, IOC enrichment, live CISA advisory feed, asset risk verdict (escalate:true/false), active campaign tracker, sector change feed, ICS malware encyclopedia, complete sector threat brief with risk trend, ASN infrastructure profiling, compliance-gap mapping, deterministic threat scoring and remediation risk gating, AI/agentic copilot exposure, and composed synthesis (report, dossier, sitrep, article, LinkedIn, X). DeepSeek-enriched. No API keys — pure USDC micropayments on Base via x402.

“Review Times” is shared by 2 different URLs

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

Review Times https://reviewtimes.fyi/a2a

a2a ok

Answers how long AI app, connector and plugin stores (ChatGPT plugins, Claude connectors and plugins, Meta Muse, Grok, Cursor, Microsoft 365 Agent Store, Gemini CLI, Docker MCP) take to review submissions, from crowdsourced reports and public review queues.
Review Times https://reviewtimes.fyi/mcp

mcp ok

Live review times for AI app stores: ChatGPT, Claude, Muse, Grok, Cursor. Check before you submit.

“x402 web tools” is shared by 9 different URLs

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

x402 web tools https://api.agentstools.dev

a2a mcp x402 ok

x402 listing a2a listing
x402 web tools https://api.agentstools.dev/extract

x402 ok

Pay-per-call web and on-chain data tools for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — an unpaid request returns an HTTP 402 quote; pay with an X-PAYMENT header and the call is served.
x402 web tools https://payai.agentstools.dev

a2a ok

Pay-per-call web and on-chain data tools for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — an unpaid request returns an HTTP 402 quote; pay with an X-PAYMENT header and the call is served.
x402 web tools https://payai.agentstools.dev/extract

x402 ok

Pay-per-call web and on-chain data tools for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — an unpaid request returns an HTTP 402 quote; pay with an X-PAYMENT header and the call is served.
x402 web tools https://webtools402.176-109-107-191.sslip.io/code

x402 ok
x402 Web Tools https://x402-web-tools.microtools-x402.workers.dev/mcp

mcp ok

Web/PDF to Markdown, transcription, paper search and citation checks. Pay per call in USDC via x402.
x402 Web Tools https://x402-web-tools.onrender.com/api/email-domain-check

x402 down

Pay-per-call web tools for AI agents. No API keys: pay per request in USDC on Base via x402.
x402 Web Tools https://x402-web-tools.onrender.com/api/extract

mcp x402 ok

Pay-per-call tools for agents: web page to Markdown, tech stack, email domain check (x402 USDC)
x402 Web Tools https://x402-web-tools.onrender.com/mcp

mcp ok

Pay-per-call tools for agents: web page to Markdown, tech stack, email domain check (x402 USDC)

Earnbase Human Feedback Agent

Earnbase
● healthy

Autonomous ERC-8004 agent providing Human Feedback as a Service (HFaaS). Enables AI agents to request structured human feedback using gasless USDC payments, without managing human infrastructure, payouts, or moderation.

B+9.6 🔓 open 4 skills
InspectAgents

InspectAgents
● healthy

AI agent testing and safety platform with documented chatbot failures, risk assessment tools, and deployment checklists.

C+8.7 🔓 open 4 skills
x402 web tools

x402 web tools
● healthy

Pay-per-call web and on-chain data tools for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — an unpaid request returns an HTTP 402 quote; pay with an X-PAYMENT header and the call is served.

C8.2 🔓 open HTTP+JSON 362 skills
x402 web tools

x402 web tools
● healthy

Pay-per-call web and on-chain data tools for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — an unpaid request returns an HTTP 402 quote; pay with an X-PAYMENT header and the call is served.

C8.0 🔓 open HTTP+JSON 362 skills
OT/ICS Threat Intelligence API

OT Intel API
● healthy

Hardware-aware threat intel for ICS/SCADA environments. 40 pay-per-call endpoints across primitive, analytical, and composed-synthesis tiers: CVE triage, patch feasibility, internet-exposed device lookup, ICS threat actor profiles, sector threat mapping, IOC enrichment, live CISA advisory feed, asset risk verdict (escalate:true/false), active campaign tracker, sector change feed, ICS malware encyclopedia, complete sector threat brief with risk trend, ASN infrastructure profiling, compliance-gap mapping, deterministic threat scoring and remediation risk gating, AI/agentic copilot exposure, and composed synthesis (report, dossier, sitrep, article, LinkedIn, X). DeepSeek-enriched. No API keys — pure USDC micropayments on Base via x402.

B9.4 🔓 open 40 skills
Review Times
● healthy

Answers how long AI app, connector and plugin stores (ChatGPT plugins, Claude connectors and plugins, Meta Muse, Grok, Cursor, Microsoft 365 Agent Store, Gemini CLI, Docker MCP) take to review submissions, from crowdsourced reports and public review queues.

C8.2 🔓 open
LION Attested Data & Compliance API

LION
● degraded

Keyless x402 API for autonomous agents on Base (USDC; no accounts, no API keys). Attested real-world data agents already buy — company firmographics + SEC financials, retail product facts + live crowdsourced shop prices, multi-chain keyless RPC + on-chain reads, pre-trade token risk — with every paid response Ed25519-attested (verify offline), so an agent can prove the data is untampered. Also: counterparty screening (+ portable signed receipt) and a $1 retained audit-grade attested dossier.

E4.8 🔓 open JSONRPC 24 skills
LION Attested Data & Compliance API

LION
● degraded

Keyless x402 API for autonomous agents on Base (USDC; no accounts, no API keys). Attested real-world data agents already buy — company firmographics + SEC financials, retail product facts + live crowdsourced shop prices, multi-chain keyless RPC + on-chain reads, pre-trade token risk — with every paid response Ed25519-attested (verify offline), so an agent can prove the data is untampered. Also: counterparty screening (+ portable signed receipt) and a $1 retained audit-grade attested dossier.

E4.9 🔓 open JSONRPC 24 skills