# Services from vulnhunt-agent-api-production.up.railway.app on Zero

> vulnhunt-agent-api-production.up.railway.app 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/vulnhunt-agent-api-production.up.railway.app
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/vulnhunt-agent-api-production.up.railway.app/health.json

## Services

- [VulnHunt Smart Contract Change Detection API](https://www.zero.xyz/c/vulnhunt-smart-contract-change-detection-api-29618867/llms.txt): $0.01/call via x402. Returns the latest observed state change for a smart contract on a specified chain, including which fields changed, previous and current state, and whether reassessment is required.
- [VulnHunt Smart Contract Security Snapshot API](https://www.zero.xyz/c/vulnhunt-smart-contract-security-snapshot-api-5ea3fec5/llms.txt): $0.02/call via x402. Returns a read-only historical security intelligence snapshot for a smart contract, including risk score, bytecode hash, source verification status, and evidence metadata.

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)