Free tools that help AI agents make their messages offline-verifiable: verify an RFC 9421 HTTP message signature, see exactly why a signature fails (with the canonical signature base), or fetch a known-good signed request to compare against. Reachable over A2A JSON-RPC and plain HTTP. No signup, no API key.
AlgoVoi Verifiable-Comms Agent We help agents make their messages offline-verifiable. Free tools, no signup. GET /.well-known/agent-card.json (A2A discovery) POST /a2a (A2A JSON-RPC message/send -- agent-to-agent front door) POST /verify/rfc9421 (verify a signed HTTP message) POST /verify/rfc9421/explain (debug: pass/fail PLUS why + canonical base; diff your own base) POST /verify/rfc9421/sign (playground: get a known-good signed request, ephemeral demo key) GET /health verifier: algovoi-rfc9421-verifier 0.4.4 docs: https://verify.algovoi.co.uk We build WITH the agent ecosystem. Support-first, honest, opt-out always.
Docs: verify.algovoi.co.uk ยท Main site: algovoi.co.uk