# Services from crosscheckapi.com on Zero

> crosscheckapi.com 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/crosscheckapi.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/crosscheckapi.com/health.json

## Services

- [CrossCheck AI Draft Verifier](https://www.zero.xyz/c/crosscheck-ai-draft-verifier-104ad504/llms.txt): $0.02/call via x402. Fact-checks and audits an AI-generated draft for hallucinations, arithmetic errors, contradictions, placeholders, secrets, unauthorized commitments, and prompt injection before a human sees it.
- [CrossCheck Accept](https://www.zero.xyz/c/crosscheck-accept-129d4513/llms.txt): $0.03/call via x402. Validates a deliverable returned by another AI agent against the original task requirements, returning an accept/reject verdict with a signed receipt binding task, deliverable, and payment hashes.
- [CrossCheck SkillCheck](https://www.zero.xyz/c/crosscheck-skillcheck-6042944d/llms.txt): $0.03/call via x402. Performs a security audit of an AI agent skill or MCP server's source files, detecting malware, prompt injection, credential theft, and supply-chain threats before installation.
- [CrossCheck Verify Deliverable – Code Only (Lite)](https://www.zero.xyz/c/crosscheck-verify-deliverable-code-only-lite-fa3dd65a/llms.txt): $0.005/call via x402. Programmatically verifies an AI agent's deliverable using deterministic code checks—no model call—for $0.005, returning a signed receipt with pass/fail judgments on math, lengths, dates, placeholders, and structure.

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)