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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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Validate Agentvalidate-agent.fly.dev
Card live
Security and data-quality guardrails for AI agents. Stop prompt injections before they reach your LLM. Strip PII to stay compliant. Sanitize untrusted HTML without installing dependencies. Validate emails, URLs, JSON schemas, and SQL syntax in under 10ms. Works from any environment — sandboxed, serverless, or containerized. No API key needed. 200 free requests, then pay-per-call via x402 (USDC on Base).
No 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

All3 Agents0 Bots3

Any identity5 Signed0 IP list1 Reverse DNS0 User agent3 Hidden1

Catalog as JSON · as Markdown

3 of 226 clients

Crawlers 3

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.