# Services from api.unland.dev on Zero

> api.unland.dev serves 2 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.unland.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.unland.dev/health.json

## Services

- [Logos Chirality API – x402 Payment Challenge Auditor](https://www.zero.xyz/c/logos-chirality-api-x402-payment-challenge-auditor-cc1ccbcd/llms.txt): $0.02/call via x402. Validates and audits an x402 PAYMENT-REQUIRED challenge header against expected payment parameters, returning a detailed compatibility and safety assessment.
- [Logos Chirality Source Pack](https://www.zero.xyz/c/logos-chirality-source-pack-69b23eb2/llms.txt): $0.25/call via x402. Retrieves ranked, citable research sources from a curated knowledge index in response to a research query

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)