# Services from webwache.halowerk.com on Zero

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

## Services

- [Webwache Canonical Change Compare](https://www.zero.xyz/c/webwache-canonical-change-compare-a4e588a1/llms.txt): $0.001/call via x402. Passively fetches a target URL and compares its current public content against a baseline or comparison URL to detect and evaluate changes against a specified criterion.
- [Webwache Canonical Change Monitor](https://www.zero.xyz/c/webwache-canonical-change-monitor-923e1c6f/llms.txt): $0.001/call via x402. Passively fetches a public URL and evaluates a documented criterion to determine whether a monitored condition or change threshold has been met, returning observation, verdict, and evidence source.
- [Webwache Canonical Change Snapshot](https://www.zero.xyz/c/webwache-canonical-change-snapshot-eeca7597/llms.txt): $0.001/call via x402. Fetches a passive public snapshot of a target URL and evaluates a documented change criterion, returning an observation, verdict, evidence source, and limitations.

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)