# Services from nbx4.dev on Zero

> nbx4.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/nbx4.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/nbx4.dev/health.json

## Services

- [nbx4 Contract Observations Report Fetch](https://www.zero.xyz/c/nbx4-contract-observations-report-fetch-ebe4e26f/llms.txt): $0.01/call via x402. Retrieves a block-pinned, immutable smart contract observation report for a given report ID across 16 EVM mainnets
- [nbx4 Token & Proxy Report](https://www.zero.xyz/c/nbx4-token-proxy-report-40db08fe/llms.txt): $0.01/call via x402. Returns block-evidenced metadata about a Base (chain 8453) contract address, including proxy structure, ownership, token info, best-effort source match, and snapshot comparison, with a verdict label and SVG card.

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)