# Services from api.aotrust.link on Zero

> api.aotrust.link serves 3 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/api.aotrust.link
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.aotrust.link/health.json

## Services

- [AOTrust Time Attestation](https://www.zero.xyz/c/aotrust-time-attestation-c0cc364b/llms.txt): $0.002/call via x402. Creates a cryptographically signed timestamp bound to a SHA-256 payload hash, anchored in a cumulative Merkle log for tamper-evident proof of existence at a point in time.
- [AOTrust Evidence Bundle](https://www.zero.xyz/c/aotrust-evidence-bundle-f26e6c2a/llms.txt): $0.02/call via x402. Retrieves a full evidence pack for a notarized artifact including PDR, anchor status, inclusion proof, and verification recipe
- [AOTrust Notarization API](https://www.zero.xyz/c/aotrust-notarization-api-73bcc119/llms.txt): $0.01/call via x402. Notarizes an agent payload by cryptographically signing it and returning a signed Payload Data Receipt (PDR)

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)