A2A Agents — agent-tools.cloud

Agents that publish an A2A /.well-known/agent-card.json — 6499 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 6499 indexed agents, 5646 currently healthy.

Agents indexed

6499 agents

5664 domains

public agent cards · +720 this week

Healthy

5646 agents

4962 domains

card reachable < 6 h

Conformant

4755 agents

4165 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

“Sonar” is shared by 2 different URLs

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

Sonar https://server.smithery.ai/sutarik-peter/sonar/mcp

mcp degraded

App Store Optimization for AI agents — the official MCP server for [Sonar](https://trysonar.app). **43 tools** covering the full ASO workflow on the iOS App Store and Google Play: - **Keyword research** — difficulty & popularity scores, autocomplete suggestions, related terms - **App intelligence** — metadata lookup, store search, ASO audit score, keyword extraction, revenue estimation - **Reviews** — fetch and mine app reviews with rating filters - **Rank tracking** — daily rank history for your tracked keywords (Full plan) - **Competitor analysis** — keywords competitors rank for + gap analysis vs your app (Full plan) - **Workspace writes** — set up products, track keywords/competitors, manage alerts (Full plan + write-scope key) **Auth:** pass your Sonar API key (`aso_...`) — create one at [trysonar.app/developers](https://trysonar.app/developers). Stateless research tools work on any plan with credits; new accounts get free credits on signup.
Sonar https://server.smithery.ai/trysonar/sonar/mcp

mcp ok

App Store Optimization for AI agents — the official MCP server for [Sonar](https://trysonar.app). **43 tools** covering the full ASO workflow on the iOS App Store and Google Play: - **Keyword research** — difficulty & popularity scores, autocomplete suggestions, related terms - **App intelligence** — metadata lookup, store search, ASO audit score, keyword extraction, revenue estimation - **Reviews** — fetch and mine app reviews with rating filters - **Rank tracking** — daily rank history for your tracked keywords (Full plan) - **Competitor analysis** — keywords competitors rank for + gap analysis vs your app (Full plan) - **Workspace writes** — set up products, track keywords/competitors, manage alerts (Full plan + write-scope key) **Auth:** pass your Sonar API key (`aso_...`) — create one at [trysonar.app/developers](https://trysonar.app/developers). Stateless research tools work on any plan with credits; new accounts get free credits on signup.

“AIsa” is shared by 3 different URLs

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

AIsa https://aisa.network

x402 degraded

Leading x402 payment processor with **10.5M+ cumulative transactions** on the x402 network, demonstrating massive production scale for autonomous agent payments and micropayment infrastructure.
AIsa https://api.aisa.one

a2a ok

Capability layer for the agentic economy. Models, skills, payments, and deployment — everything AI agents need to reason, act, and transact.
AIsa https://mcp.aisa.one/mcp

mcp ok

Go-to-market data, one key: 950+ APIs across SEO, finance, social, search, sales, agent mail.

“HefestoAI” is shared by 3 different URLs

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

HefestoAI https://hefestoai--artvepa80.run.tools

mcp ok

uptime_30d 1.0%; p95 331.7ms; conformance: fail
HefestoAI https://hefestoai.narapallc.com/api/mcp-protocol

a2a mcp ok

Pre-commit code quality guardian. Detects semantic drift in AI-generated code.

mcp listing a2a listing
HefestoAI https://server.smithery.ai/artvepa80/hefestoai/mcp

mcp ok

HefestoAI checks AI-generated code before you ship it. Add it to Claude, Cursor or ChatGPT in about a minute: paste the server URL, then ask your agent to analyze a file. Free tools: analyze (10/min), pricing, install, compare.

AIsa

AIsa
● healthy

Capability layer for the agentic economy. Models, skills, payments, and deployment — everything AI agents need to reason, act, and transact.

A9.8 🔓 open 43 skills
ScriptMasterLabs mcp-x402 Data Node

Script Master Labs LLC
● healthy

Self-monetizing execution node exposing 142 capabilities (129 paid via x402, 13 free) — federal grants/contracts, SEC filings, FDA/clinical data, market intelligence, crypto/FX rates, and agent reputation scoring. Paid skills settle per-invocation in USDC on Base — no accounts, no API keys, no human onboarding.

B+9.7 🔓 open HTTP+JSON 142 skills
HefestoAI

Narapa LLC
● healthy

Release truth engine for AI-generated code. Before merge, it checks that what a project declares (dependencies, configs, install artifacts) matches what it actually does, and runs security and complexity checks on the code. Analyzers for 22 formats (7 code languages + 15 DevOps/IaC); hefesto analyze runs all 22 of them.

C+8.7 🔓 open 4 skills