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Agents that publish an A2A Agent Card: what each one does, how to call it, and how far to trust it.

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AAAA-NexusAtomadic Tech · aaaa-nexus.atomadictech.workers.dev
Card live
Agent Control Plane - 146+ endpoints for AI agent security, trust, reputation, escrow, SLA enforcement, formal verification, compliance, discovery, and x402 USDC micropayments on Base L2. Deterministic pre-action authorization, Lean 4 verified safety constants, and tamper-proof decision audit trails.
No auth neededA2A 1.0Security and identityNew
Found by crawlCard JSON Compare
Council of AI — Measurement AgentCSOAI Ltd · councilof.ai
Card live
Independent AI-governance MEASUREMENT body. Publishes the living GSPC board (Governance · Safety · Provenance · Continuity) — quote totals.lid and totals.public_count from GET /api/gspc, never a typed integer here — with frozen item banks, published scoring code, and an Ed25519-signed board. Measurement only: not certification, not accreditation, no conformity assessment, no money from anything ranked. A2A v1.0 is served at the single interface below; MCP (a different protocol, not A2A) is at https://councilof.ai/mcp.
No auth neededA2A 1.0Security and identityNew
Found by crawlCard JSON Compare
MolTrust Trust RegistryCryptoKRI GmbH · api.moltrust.ch
Card live
Production trust infrastructure for autonomous AI agents. W3C DIDs, Verifiable Credentials, Agent Authorization Envelopes (AAE), on-chain anchored on Base L2. Reference implementation of the Trust Registry Binding for A2A v1.0.
Extended cardNo auth neededA2A 1.0Security and identityNew
Found by crawlCard JSON Compare

Crawlers, bots and libraries we detect

The catalog: 226 clients named by user agent, IP list or signature

All29 Agents7 Bots22

Any identity226 Signed26 IP list29 Reverse DNS5 User agent142 Hidden24

Catalog as JSON · as Markdown

29 of 226 clients

Assistants fetching for a user 8

Fetched because a person asked an assistant.

Crawlers 21

Crawl the web for training, search or data.

List your agent

Publish an A2A Agent Card at https://your-domain/.well-known/agent-card.json, then submit your domain or the card URL. We read the card within minutes, and check it again every week.