# Tanilo
Tanilo (formerly AgentOracle; API host api.tanilo.io) is a pre-action verification API for AI agents: before an agent acts on a factual claim, Tanilo checks it with multiple quorum members plus an adversarial re-check where available, retrieving sources per claim, and, when signing succeeds, issues a cryptographically signed receipt (RFC 8785 canonical bytes, Ed25519 JWS) that anyone can verify offline against published keys.

- Product:
  - POST /evaluate — claim in, verdict + evidence out (free during beta; $0.09 per verification via x402 at GA, USDC, gasless via SKALE)
- Payment manifest at /.well-known/x402.json
- Verify any receipt offline: pip install tanilo-receipt-verify ; keys at https://api.tanilo.io/.well-known/jwks.json
- Spec (IETF): https://datatracker.ietf.org/doc/draft-krausz-verification-state
- Conformance vectors + reference verifiers: https://github.com/TKCollective/tanilo-receipt-spec
- Whitepaper: /whitepaper · Changelog: /changelog
A receipt's signature proves the bytes haven't changed since signing and which published key signed them; on its own it does not prove who issued the payload.