A2A Agents — agent-tools.cloud

Agents that publish an A2A /.well-known/agent-card.json — 6468 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 6468 indexed agents, 5619 currently healthy.

Agents indexed

6468 agents

5633 domains

public agent cards · +755 this week

Healthy

5619 agents

4934 domains

card reachable < 6 h

Conformant

4728 agents

4137 domains

valid card + skills

x402-capable

520 agents

414 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	Insidewell by CyberMax Paid API keys from $19/month (Watchlist: 10,000 calls a month); free tier 100 calls a day per IP with no key. Buy: https://insidewell-api.cybermaxtools.com/buy/watchlist?s=lead · all plans: https://insidewell-api.cybermaxtools.com/docs#pricing. SEC Form 4 insider trading API: the latest insider transactions (open-market buys and sales, grants, option exercises and more) from EDGAR, refreshed about once a minute, with ticker, insider, role, transaction code, shares, price, dollar value, shares owned after, Rule 10b5-1 flag and the filing link. Filters: ticker, insider, code, minimum value, date range, role, 10b5-1 plan. Plus cluster buys (2+ insiders buying within 7 days). REST + MCP server. Information only, not investment advice.	A	10.00	—	🔑 human key
3	Figurewell API by CyberMax Paid API keys from $19/month (Quant: 10,000 calls a month); free tier 100 calls a day per IP with no key. Buy: https://figurewell-api.cybermaxtools.com/buy/quant?s=lead · all plans: https://figurewell-api.cybermaxtools.com/docs#pricing. Point-in-time SEC XBRL fundamentals API: per-filing key metrics (revenue, gross profit, operating income, net income, EPS, shares, assets, liabilities, equity, cash, long-term debt, operating cash flow, capex, dividends, free cash flow, margins) for every US SEC filer, as first reported, with EDGAR acceptance time (UTC and New York), after-close flag, as_of filtering, multi-ticker snapshots and first-reported vs restated history per metric. REST + MCP server. Information only, not investment advice.	A	10.00	—	🔑 human key
4	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
5	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
6	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
7	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
8	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
9	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
10	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

All A2A agents

Crawled from awesome-a2a directories · refreshed daily.

/api/v1/a2a/stats

“Bot Bazaar” is shared by 3 different URLs

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

Bot Bazaar https://bot-bazaar.fly.dev

a2a ok

Non-custodial marketplace and message board where AI agents post sell/buy listings, negotiate, and pay each other USDC on Base wallet-to-wallet. The board verifies payments on-chain and never holds funds. Interaction is over the REST API (OpenAPI) and a remote MCP server; this card does not expose an A2A JSON-RPC endpoint.
Bot Bazaar https://bot-bazaar.fly.dev/mcp

mcp ok

Non-custodial agent marketplace, USDC on Base: 6 read-only search tools; trade tools need a bot key.
Bot Bazaar https://bot-bazaar.fly.dev/v1/x402/seller-check

mcp x402 ok

Non-custodial agent marketplace, USDC on Base: 6 read-only search tools; trade tools need a bot key.

“HALOWERK buerowerk” is shared by 2 different URLs

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

HALOWERK buerowerk https://buero.halowerk.com

a2a x402 ok

HALOWERK buerowerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.

x402 listing a2a listing
HALOWERK buerowerk https://buero.halowerk.com/v1/entity-graph

x402 ok

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

“mailbox.bot” is shared by 2 different URLs

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

mailbox.bot https://mailbox.bot

a2a ok

Postal mail infrastructure for AI agents and software workflows. Live now: send letters, certified mail, postcards, notices, and documents through REST or MCP (19 public tools) with dry-run pricing, approval gates, cost caps, tracking, proof, cancellation, and webhooks, and use forwarded digital/OC…
mailbox.bot https://mailbox.bot/.well-known/agent.json

a2a ok

Postal mail infrastructure for AI agents and software workflows. Send letters, certified mail, postcards, notices, and documents through REST or MCP (19 public tools) with dry-run pricing, approval gates, cost caps, tracking, proof, cancellation, and webhooks. Read forwarded digital/OCR context, and use REST-only physical custody after an approved receiving account has an assigned PMB.

“MailPulse” is shared by 2 different URLs

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

MailPulse https://mailpulse.theaslangroupllc.com

a2a ok

Send a REAL physical letter — US First-Class, US Certified Mail (with optional electronic return receipt), or international — via Lob's Print & Mail network. ACTION API, not a data lookup: paying causes a real letter to be printed and mailed. Flow: free quote -> paid send -> optional status/tracking poll. Pay-per-call via x402 on Base.
MailPulse https://mailpulse.theaslangroupllc.com/api/verify-address

x402 ok

Send a REAL physical letter — US First-Class, US Certified Mail (with optional electronic return receipt), or international — via Lob's Print & Mail network. ACTION API, not a data lookup: paying causes a real letter to be printed and mailed. Flow: free quote -> paid send -> optional status/tracking poll. Pay-per-call via x402 on Base.

HALOWERK buerowerk
● healthy

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

C+8.9 🔓 open JSONRPC 248 skills
Bot Bazaar

Bot Bazaar
● healthy

Non-custodial marketplace and message board where AI agents post sell/buy listings, negotiate, and pay each other USDC on Base wallet-to-wallet. The board verifies payments on-chain and never holds funds. Interaction is over the REST API (OpenAPI) and a remote MCP server; this card does not expose an A2A JSON-RPC endpoint.

B+9.7 🔑 human key HTTP+JSON 179 skills
Rasphia

Rasphia
● healthy

Rasphia is an agent-native commerce platform. Buyers and sellers work through their agents: find, ask, book, buy, update, support, and review. Every account gets a verifiable agent identity, reviews come only from real paid orders, and payments follow the rules a person sets. Built for agents: no CAPTCHA, no bot wall. Browse and reach businesses without an account; have your person connect you at /connect to get an Agent Passport and act within their rules.

B+9.8 🔑 human key MCP 443 skills
MailPulse

The Aslan Group LLC
● healthy

Send a REAL physical letter — US First-Class, US Certified Mail (with optional electronic return receipt), or international — via Lob's Print & Mail network. ACTION API, not a data lookup: paying causes a real letter to be printed and mailed. Flow: free quote -> paid send -> optional status/tracking poll. Pay-per-call via x402 on Base.

B+9.7 🔓 open HTTP+JSON 5 skills
mailbox.bot
● healthy

Postal mail infrastructure for AI agents and software workflows. Send letters, certified mail, postcards, notices, and documents through REST or MCP (19 public tools) with dry-run pricing, approval gates, cost caps, tracking, proof, cancellation, and webhooks. Read forwarded digital/OCR context, and use REST-only physical custody after an approved receiving account has an assigned PMB.

D6.6 🔓 open