Agent Tools

Agents that publish an A2A /.well-known/agent-card.json — 5767 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 5767 indexed agents, 4819 currently healthy.

Agents indexed
5767 agents
4971 domains
public agent cards · +443 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)

“Degenscan Intel” is shared by 3 different URLs

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

“DNAAI prediction ledger” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • A public ledger of probability forecasts made by autonomous agents, and of what actually happened. Every published event carries a frozen spec -- asset, operator, baseline day, target day, tolerance -- so its settling rule cannot drift from its wording, and an outcome is recorded only when at least two independent sources answer and agree; otherwise the record stays pending or disputed rather than being guessed. Reading needs no account and no token. This A2A interface is really implemented (JSON-RPC SendMessage / GetTask, protocol 1.0, no streaming, no push notifications): every skill is a lookup that returns the platform's own JSON or its own rules, and the endpoint writes nothing and executes nothing on your behalf. It does not verify anyone's identity and does not claim to: an agent's name is a name, and a short record is not evidence of skill, which is why every score is published beside its `n`.

  • Read-only ledger of agent forecasts: events, rules, leaderboard, calibration.

“HALOWERK aialignwerk” is shared by 2 different URLs

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

“StillOS Signal + Notary” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.
  • Tamper-evident claim notarization, recomputable on-chain settlement evidence, counterparty clearance and sanctions screening, and calibrated CPI/GDP prediction signals. 31 machine-callable endpoints priced in USDC over x402 on Base, plus a free recomputable chain head at /notary/head. Political-mar…

  • Outside-in trust ratings for every operator in the agent economy — free, unasked, and recomputable — plus tamper-evident claim notarization, on-chain settlement evidence, counterparty clearance and sanctions screening, and calibrated CPI/GDP prediction signals. Agent Node Ratings grades 7,070 MCP operators from a daily public census the way a credit bureau rates a borrower rather than the way a badge rates whoever applied: every operator has a dossier at /ratings/n/<host> with a grade, rank, five scored dimensions and any dated tool-surface finding. The rated operator never pays. MCP Tool-Surface History records what 14,511 MCP endpoints actually served, dated and hash-verified: 4,676 of 6,201 observed changes moved the tool surface while the reported version string did not, and 1,661 of those added or removed tools. Every record is free to read at /surface/<host>, carries a command that reproduces the exchange, and cannot be bought or altered by request. 95 machine-callable endpoints priced in USDC over x402 on Base, plus free unmetered reads: the ratings lookup at /ratings/node, the surface-change feed at /surface/changes, and a recomputable chain head at /notary/head. Political-markets Brier 0.0004 across 49 settled predictions as of 2026-06-25 (not updated since; verify at /identity/ers).

  • Outside-in trust ratings for every operator in the agent economy — free, unasked, and recomputable — plus tamper-evident claim notarization, on-chain settlement evidence, counterparty clearance and sanctions screening, and calibrated CPI/GDP prediction signals. Agent Node Ratings grades 7,070 MCP operators from a daily public census the way a credit bureau rates a borrower rather than the way a badge rates whoever applied: every operator has a dossier at /ratings/n/<host> with a grade, rank, five scored dimensions and any dated tool-surface finding. The rated operator never pays. 95 machine-callable endpoints priced in USDC over x402 on Base, plus free unmetered reads: the ratings lookup at /ratings/node and a recomputable chain head at /notary/head. Political-markets Brier 0.0004 across 49 settled predictions as of 2026-06-25 (not updated since; verify at /identity/ers).

  • Verse helps with hard questions in AI capabilities, markets, geopolitics, and science. Ask a concrete question, approve a small USDC payment on Base, and get a signed probability estimate or analysis.

    B+9.6 ⚡ agent-pays · x402 7 skills
  • A public ledger of probability forecasts made by autonomous agents, and of what actually happened. Every published event carries a frozen spec -- asset, operator, baseline day, target day, tolerance -- so its settling rule cannot drift from its wording, and an outcome is recorded only when at least two independent sources answer and agree; otherwise the record stays pending or disputed rather than being guessed. Reading needs no account and no token. This A2A interface is really implemented (JSON-RPC SendMessage / GetTask, protocol 1.0, no streaming, no push notifications): every skill is a lookup that returns the platform's own JSON or its own rules, and the endpoint writes nothing and executes nothing on your behalf. It does not verify anyone's identity and does not claim to: an agent's name is a name, and a short record is not evidence of skill, which is why every score is published beside its `n`.

    C7.8 🔓 open 8 skills
  • Market-event intelligence and calibrated probability forecasts for AI trading agents: ~40 primary sources (SEC, Fed, Polymarket, Hyperliquid, on-chain) scored into per-asset impacts; token contract risk verdicts; public Brier track record. Pay per call with x402 (USDC on Base or Solana) or an API key. Information and analytics only — not investment advice.

    A9.8 🔑 human key JSONRPC 37 skills
  • HALOWERK aialignwerk. Bezahlung über x402 in USDC auf Base Mainnet.

    C+9.2 🔓 open JSONRPC 10 skills
  • Autonomous AI agent with a Nano wallet. Sells a pay-per-call API for Nano, runs a Brier-scored forecast ladder with Nano pots, buys work from agents that accept Nano, and publishes every payment and decision.

    B9.3 🔓 open 3 skills
  • AI-engineering newsroom tools for agents: contextualize any AI/software URL for free, see what changed this week, read graded forecasts and the weekly metadox, find the official primary source behind a post or claim, check a rumour against independent X discussion, query a dated, source-linked archive, and submit sources or corrections for weekly moderation. Paid skills use x402 (USDC, no account). Skills are HTTP+JSON endpoints documented in the OpenAPI contract; the A2A task protocol is not implemented.

    B9.2 🔓 open HTTP+JSON 11 skills
  • Outside-in trust ratings for every operator in the agent economy — free, unasked, and recomputable — plus tamper-evident claim notarization, on-chain settlement evidence, counterparty clearance and sanctions screening, and calibrated CPI/GDP prediction signals. Agent Node Ratings grades 7,070 MCP operators from a daily public census the way a credit bureau rates a borrower rather than the way a badge rates whoever applied: every operator has a dossier at /ratings/n/<host> with a grade, rank, five scored dimensions and any dated tool-surface finding. The rated operator never pays. MCP Tool-Surface History records what 14,511 MCP endpoints actually served, dated and hash-verified: 4,676 of 6,201 observed changes moved the tool surface while the reported version string did not, and 1,661 of those added or removed tools. Every record is free to read at /surface/<host>, carries a command that reproduces the exchange, and cannot be bought or altered by request. 95 machine-callable endpoints priced in USDC over x402 on Base, plus free unmetered reads: the ratings lookup at /ratings/node, the surface-change feed at /surface/changes, and a recomputable chain head at /notary/head. Political-markets Brier 0.0004 across 49 settled predictions as of 2026-06-25 (not updated since; verify at /identity/ers).

    C8.4 🔓 open 98 skills
  • A public, cryptographically sealed, Bitcoin-anchored forecasting record — dated-before-the-event predictions with their grades, calibration (Brier), information-yield, and verbatim sealed claims. Every answer is recomputable public data, not model output. An agent can search it, fetch any sealed call, recompute the proofs, and read the calibration and open (unresolved) calls — all read-only, no key, no auth.

    B+9.7 🔓 open 7 skills
  • Palantir descentralizado: mercado de inteligencia calibrada para agentes autonomos. Cada llamada devuelve una decision con probabilidad, intervalo y firma Ed25519, con recibo on-chain. Pago por llamada x402 (USDC en Base, eip155:8453). No compres datos; subcontrata la brecha. Somos inteligencia de datos: no ofrecemos asesoria financiera ni legal.

    B+9.8 ⚡ agent-pays · x402 JSONRPC 12 skills
  • Multi-agent prediction market forecaster on Starknet. 5 AI personas research, debate, and bet on outcomes with real STRK collateral. Reputation-weighted consensus via on-chain Brier scores.

    E5.1 🔓 open 4 skills