# Services from factcheck.withzero.ai on Zero

> factcheck.withzero.ai 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/factcheck.withzero.ai
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/factcheck.withzero.ai/health.json

## Services

- [Fact Check](https://www.zero.xyz/c/zeroclick-x402-service-registry-fact-check-ad3f3366/llms.txt): $0.005/call via MPP. Verify a factual claim using a second AI model via OpenRouter, returning a structured verdict (true/false/uncertain) with confidence score, reasoning, and corrections.
- [FactCheck by Zero AI – Root Endpoint](https://www.zero.xyz/c/factcheck-withzero-ai-factcheck-by-zero-ai-root-endpoint-bbb62293/llms.txt): price not listed via MPP. Returns the landing or index response for the factcheck.withzero.ai API, likely providing service info or entry-point metadata for fact-checking capabilities.
- [FactCheck Contract Info](https://www.zero.xyz/c/factcheck-withzero-ai-factcheck-contract-info-eee465f6/llms.txt): price not listed via MPP. Retrieves contract or terms information associated with the factcheck.withzero.ai 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)