# Services from delta.rursus.app on Zero

> delta.rursus.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/delta.rursus.app
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/delta.rursus.app/health.json

## Services

- [Rursus Delta Snapshot Monitor](https://www.zero.xyz/c/rursus-delta-snapshot-monitor-7016bc15/llms.txt): $0.01/call via x402. Takes a normalized snapshot of a public JSON, RSS, or Atom feed and returns a signed cursor, enabling free polling and paid retrieval of only changed items (added, updated, or removed).
- [SourceLens by FreshDelta](https://www.zero.xyz/c/sourcelens-by-freshdelta-f6605ab4/llms.txt): $0.01/call via x402. Inspects a public JSON, RSS, or Atom URL, auto-detects its record structure, and returns a verified monitoring configuration with stable IDs, selected fields, confidence score, and warnings.

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)