# Services from sellat.app on Zero

> sellat.app serves 4 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/sellat.app
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/sellat.app/health.json

## Services

- [Sellat Qualified Timestamp – Issue eIDAS Proof](https://www.zero.xyz/c/sellat-qualified-timestamp-issue-eidas-proof-1428abd3/llms.txt): $0.9/call via x402. Issues an EU eIDAS-qualified RFC 3161 electronic timestamp (.tsr) on a Sellat proof, legally demonstrating a file's existence at a specific point in time across the EU.
- [Sellat Proof of Existence (SHA-256 Blockchain Anchoring)](https://www.zero.xyz/c/sellat-proof-of-existence-sha-256-blockchain-anchoring-0acdda25/llms.txt): $0.01/call via x402. Anchors a SHA-256 hash on Polygon blockchain and attests it on Bitcoin via OpenTimestamps, returning a verifiable certificate, proof.json, and evidence ZIP
- [Sellat eIDAS Qualified Electronic Timestamp (RFC 3161)](https://www.zero.xyz/c/sellat-eidas-qualified-electronic-timestamp-rfc-3161-ddbfd007/llms.txt): $0.9/call via x402. Issues an EU eIDAS-qualified electronic timestamp (RFC 3161) on an existing Sellat proof, giving it full legal presumption of accuracy before EU courts and authorities under Article 41.2 eIDAS.
- [Sellat Wallet API Key Generation](https://www.zero.xyz/c/sellat-wallet-api-key-generation-3359b945/llms.txt): $0.01/call via x402. Generates a new read-only API key associated with a payer wallet address for the Sellat qualified timestamp service

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)