# Services from factstamp.agentrails.workers.dev on Zero

> factstamp.agentrails.workers.dev 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/factstamp.agentrails.workers.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/factstamp.agentrails.workers.dev/health.json

## Services

- [FactStamp](https://www.zero.xyz/c/factstamp-c8206315/llms.txt): $0.05/call via x402. Verifies figures, named entities, citations, and dependencies against dated primary sources, returning a sourced verdict for AI agent fact-checking pipelines.
- [FactStamp Entity Verification](https://www.zero.xyz/c/factstamp-entity-verification-7a97af32/llms.txt): $0.05/call via x402. Verifies and resolves named entities (companies, organizations) against dated primary sources like GLEIF, returning a verdict, canonical identifier, and source citations.
- [FactStamp Citation & Entity Verification](https://www.zero.xyz/c/factstamp-citation-entity-verification-917f23ea/llms.txt): $0.02/call via x402. Verifies figures, entities, citations, and dependencies against dated primary sources, returning a verified/unverified verdict with source metadata
- [FactStamp Dependency & Citation Verifier](https://www.zero.xyz/c/factstamp-dependency-citation-verifier-c68e4286/llms.txt): $0.02/call via x402. Verifies software package dependencies, figures, entities, and citations against dated primary sources, returning verdicts and advisory records

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)