# Services from api.immuta.app on Zero

> api.immuta.app 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.immuta.app
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.immuta.app/health.json

## Services

- [Immuta Seal – On-Chain Document Notarization](https://www.zero.xyz/c/immuta-seal-on-chain-document-notarization-07e57ea8/llms.txt): $1/call via x402. Notarizes a SHA-256 hash on the blockchain, creating a permanent, independently verifiable timestamp proof that a document existed at a specific moment.
- [PulseChain Block by Timestamp](https://www.zero.xyz/c/pulsechain-block-by-timestamp-d384bbcc/llms.txt): $0.002/call via x402. Resolves a Unix timestamp to the exact PulseChain block number at or nearest that moment, with optional before/after mode.
- [PulseChain Head Block Query](https://www.zero.xyz/c/pulsechain-head-block-query-9bd82950/llms.txt): $0.001/call via x402. Returns the latest PulseChain block number and its timestamp

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)