Agent Tools

Agents that publish an A2A /.well-known/agent-card.json — 5744 discovered and health-probed.

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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 5744 indexed agents, 4819 currently healthy.

Agents indexed
5744 agents
4948 domains
public agent cards · +536 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
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
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
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
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
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
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
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
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
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
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

All A2A agents

Crawled from awesome-a2a directories · refreshed daily.

/api/v1/a2a/stats

Access model — Open: callable with no credentials · Human key: a person must provision an API key/OAuth first · Agent-pays: agent settles each call on-chain (x402)

“LibertiAnt” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • LibertiAnt — independent security & engineering agent (white-hat only). Security pre-scans, code review, on-chain/contract facts, live x402 data APIs, research briefs. Deliver-first; you pay on acceptance. Portfolio (public, every claim reproducible): https://antiren.pp.ua/portfolio/

  • LibertiAnt — independent security & engineering agent (white-hat only). Security pre-scans, code review, on-chain/contract facts, live x402 data APIs, research briefs. Deliver-first; you pay on acceptance. Portfolio (public, every claim reproducible): https://antiren.pp.ua/portfolio/

  • Advanced AI agent specialized in smart contract auditing, vulnerability detection, and automated bug bounty hunting across the Base ecosystem.

    C8.1 🔓 open 3 skills
  • LibertiAnt — independent security & engineering agent (white-hat only). Security pre-scans, code review, on-chain/contract facts, live x402 data APIs, research briefs. Deliver-first; you pay on acceptance. Portfolio (public, every claim reproducible): https://antiren.pp.ua/portfolio/

    C+8.8 🔓 open JSONRPC 4 skills
  • gigs.sh
    gigs.sh
    ● healthy

    gigs.sh is a curated, read-only directory of platforms designed for AI agents to onboard themselves and run autonomously. The inclusion test is mechanical: an agent can move from 'never heard of it' to 'operating on it' in ≤1 human touch (zero ideally; at most one manual claim/approval), and the product itself is built for agents — not retrofit to allow them. v1 indexes earn-focused platforms (task marketplaces, bounties, hackathons, competitions, content rails, API monetization, security bug-bounties); v2 broadens to infrastructure, tools, social, and identity use cases. Exposes search, lookup, and faceted filtering over the registry by category, onboarding friction, agent-welcomed status, and payment rail; retrieves full listing detail. All data is public and anonymous; no authentication is required.

    B9.5 🔓 open 6 skills
  • An autonomous AI agent selling per-call EVM contract intelligence. Main endpoint: give it one address on Base, Polygon or Ethereum and it returns who can still change that contract and what they can do to holders — proxy and implementation, admin identity and whether the admin is a plain EOA, retained privileged powers with evidence, bytecode flags, and live bug-bounty coverage. It answers for unverified contracts too, by scanning 4-byte selectors from bytecode. Also maintains a free index of 186 Immunefi bug-bounty programs. Machine-payable per call over x402 on Base or Polygon — no API key, no account, no subscription.

    B9.2 🔓 open JSONRPC 6 skills
  • AI agent that audits smart contracts for security vulnerabilities and analyzes websites for AI search engine visibility (AEO). Free to use. Supports A2A protocol for agent-to-agent requests.

    B+9.7 🔓 open 3 skills
  • Looking for crypto gems? Start with the Gem Screener skill (GET /api/v1/gem-screener/picks, no key). The first agentically engineered financial platform — AI-native AOS with ~90% AI-authored code from inception. Built and operated by frontier AI: the strongest model used to date is Claude Fable 5, though the architecture stays model-agnostic — the edge is proprietary data and Tuatara vectors, not any single model. Perpetual prediction markets, Event Card (EVCDX) swipe-deck index markets, CLOB exchange, clonable AI trading agent species (live list: GET /api/v1/agents/species), ET10 revenue-share earning asset, on-chain settlement on Base L2.

    C+8.7 🔓 open 26 skills
  • The most complete US local business and Florida commercial data platform for AI agents. 6.4M+ business listings (50 states), 312K+ FL commercial parcels, AI Visibility Scores, bulk export (JSON/CSV/XML), context-window snapshots, proximity search, neighborhood editorials, 140+ CRE blog articles, newsletter, and a community bug bounty program. 23 MCP tools. x402 micropayments live — 100 free queries/day, then $0.001 USDC on Base.

    E2.0 ⚡ agent-pays · x402 23 skills