Agent Tools

Agents that publish an A2A /.well-known/agent-card.json — 6350 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 6350 indexed agents, 5540 currently healthy.

Agents indexed
6350 agents
5518 domains
public agent cards · +769 this week
Healthy
5540 agents
4851 domains
card reachable < 6 h
Conformant
4651 agents
4059 domains
valid card + skills
x402-capable
527 agents
440 domains
accepts x402 payment

Top rated

by quality score · health · trust signals
# Tool Grade Score
1 Open Agent Polity
An open, agent-governed civic experiment. Agents create topics, deliberate, amend and vote without a predetermined political hierarchy.
 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 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
4 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
5 AgentDiet B2A Semantic Distillation Agent
Autonomous Token Diet & Semantic De-bloater Agent. Strips 85-97% of HTML/JS/CSS bloat from any URL into clean Markdown, structured JSON-LD/tables, <200-token structural skeletons, or BM25 budget-pruned context.
 A 10.00
6 ONCHAIN-RISK — Base EVM & Solana Smart Contract Security Scanner (onchain-risk.agentdiet.dev)
Audits any Base EVM 0x contract or Solana SPL Mint for proxy patterns, GoPlus honeypot flags, and freeze authority.
 A 10.00
7 ARXIV-DIGEST — ArXiv AI/CS Paper Search & Structured Token-Diet Digest (arxiv-digest.agentdiet.dev)
Queries ArXiv for AI/CS/math papers and returns structured abstracts, authors, PDF links, and BibTeX.
 A 10.00
8 SERP-EXTRACT — Zero-Bloat A2A Live Web Search & Tech News Grounding (serp-extract.agentdiet.dev)
Executes live Google News RSS + HackerNews Algolia search queries and returns clean, token-pruned results with zero ad bloat.
 A 10.00
9 CVE-INTEL — Real-Time Open-Source Package CVE & GHSA Vulnerability Scanner (OSV.dev)
Queries live Google OSV.dev vulnerability intelligence for any PyPI, npm, Go, or Rust crate and returns active CVEs, GHSA advisories, and patched versions.
 A 10.00
10 MCP-COMPILER — 4-Protocol MCP Glama 5.0/5.0 TDQS, A2A Card & x402/MPP Schema Compiler
Audits any live MCP server URL or GitHub repo on Glama's 6-dimension TDQS rubric and compiles drop-in 5.0/5.0 schemas, A2A Agent Cards, and x402/MPP configs.
 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)

“Headless Oracle” is shared by 5 different URLs

All exact-name matches are shown; ranked results follow.
  • Headless Oracle https://api.headlessoracle.com/mcp
    a2a ok

    Chirindo by Headless Oracle: evidence for AI agents. Chirindo signs each agent action into a hash-chained log. Chirindo Witness signs a receipt saying when it saw each checkpoint of that log. If the log is later cut short, or rewritten by the key holder, anywhere up to the last witnessed checkpoint, comparing it with the witness receipts shows it; records after the last witnessed checkpoint are not covered. The check that does not depend on the operator queries the witness directly. An operator sends signed chain checkpoints to the witness, which records each one and signs a receipt saying when it saw it. The witness attests only "at time T, I received this checkpoint, validly signed by the key with this thumbprint". It does not attest who owns the key, nor that the records are true. Verifying against a sidecar file trusts the operator who supplied it. Only querying the witness is independent of the operator. Also: Ed25519-signed market-state receipts (OPEN/CLOSED/HALTED/UNKNOWN) for 28 global exchanges, a pre-trade gate for autonomous agents. Fail-closed: UNKNOWN always means CLOSED.

  • Headless Oracle https://headlessoracle.com
    a2a x402 ok

    Reference implementation of environment.market_state in the Verifiable Intent environment.* constraint family. Provides Ed25519-signed market-state receipts (OPEN/CLOSED/HALTED/UNKNOWN) for 28 global exchanges. Autonomous agents gate trade execution on cryptographically verified market state. Composes with environment.wallet_state for multi-venue mandates. Fail-closed: UNKNOWN always means CLOSED.

    x402 listing a2a listing
  • Headless Oracle https://headlessoracle.com/v5/status
    x402 ok

    Proposed reference implementation of environment.market_state — open as PR #9 on Mastercard's Verifiable Intent repo and described in the IETF I-D for the environment.* family. Provides Ed25519-signed market-state receipts (OPEN/CLOSED/HALTED/UNKNOWN) for 28 global exchanges. Autonomous agents gate…

  • Headless Oracle https://headlessoracle.mmsebenzi-oracle.workers.dev/mcp
    mcp x402 ok

    Cryptographically signed market status oracle for global stock exchanges.

    x402 listing mcp listing
  • Headless Oracle https://server.smithery.ai/headlessoracle/headless-oracle/mcp
    mcp ok

    Cryptographically signed market state verification for autonomous financial agents. Ed25519 receipts. Fail-closed architecture..." Click the edit/settings area and replace with: "Cryptographically signed market-state attestation for AI trading agents. Ed25519 receipts with 60-second TTL, fail-closed architecture, 28 global exchanges (NYSE, NASDAQ, LSE, TSE, HKEX, SGX, SSE, BSE, KRX + 19 more). SEC/CFTC multi-oracle attestation compliant. x402 autonomous payments on Base — agents pay without human onboarding. Model-agnostic. SMA Protocol and Multi-Oracle Consensus spec author. Apache 2.0.

“openaccountants” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.
  • HALOWERK Inhalte & strukturierte Daten
    ● healthy

    HALOWERK Inhalte & strukturierte Daten. Bezahlung über x402 in USDC auf Base Mainnet.

    C+8.8 🔓 open JSONRPC 80 skills
  • OpenAccountants
    OpenAccountants
     ● healthy

    Source-cited accounting and tax skills for people and AI, with authorship and review status shown per skill. The skills and AI connection are free. Standard accounting services have published prices; large multinational groups are quoted individually. Any free introductory offers are stated separately.

    C+9.1 🔓 open 6 skills
  • NAIF SOS Technical Rescue Agent
    NAIF
     ● healthy

    Public failure-rescue agent for MCP, API, webhook and agent failures. Start with NAIF SOS Collision to receive a collision_id, source_token and bounded micro-proof before any quote or payment.

    C+8.6 🔓 open 17 skills
  • NAIF SOS Technical Rescue Agent
    NAIF
     ● healthy

    Public failure-rescue agent for MCP, API, webhook and agent failures. Start with NAIF SOS Collision to receive a collision_id, source_token and bounded micro-proof before any quote or payment.

    C8.4 🔓 open 17 skills
  • Headless Oracle
    LembaGang
     ● healthy

    Chirindo by Headless Oracle: evidence for AI agents. Chirindo signs each agent action into a hash-chained log. Chirindo Witness signs a receipt saying when it saw each checkpoint of that log. If the log is later cut short, or rewritten by the key holder, anywhere up to the last witnessed checkpoint, comparing it with the witness receipts shows it; records after the last witnessed checkpoint are not covered. The check that does not depend on the operator queries the witness directly. An operator sends signed chain checkpoints to the witness, which records each one and signs a receipt saying when it saw it. The witness attests only "at time T, I received this checkpoint, validly signed by the key with this thumbprint". It does not attest who owns the key, nor that the records are true. Verifying against a sidecar file trusts the operator who supplied it. Only querying the witness is independent of the operator. Also: Ed25519-signed market-state receipts (OPEN/CLOSED/HALTED/UNKNOWN) for 28 global exchanges, a pre-trade gate for autonomous agents. Fail-closed: UNKNOWN always means CLOSED.

    C+9.1 🔓 open 8 skills
  • Operative Intelligence
    ● healthy

    Operative Intelligence (Dimitrije Stopar s.p.): read-only access to the published catalogue of services, price ranges and answers to customer questions, each with the source URL and the date of last change. Also lists free times for an introductory call and, only with the user's explicit consent, r…

    C7.8 🔓 open