# Services from watch-diff.agent-utils.workers.dev on Zero

> watch-diff.agent-utils.workers.dev 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/watch-diff.agent-utils.workers.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/watch-diff.agent-utils.workers.dev/health.json

## Services

- [Watch & Diff](https://www.zero.xyz/c/watch-diff-9e432119/llms.txt): $0.01/call via x402. Fetches a URL, normalizes and hashes its content, then diffs it against the last known state to tell you whether it changed
- [Watch & Diff](https://www.zero.xyz/c/watch-diff-754fd805/llms.txt): $0.005/call via x402. Fetches two versions of a URL's content, normalizes and hashes them, then returns a structured diff showing exactly what changed between the before and after snapshots.
- [Watch & Diff — HTTP Headers Fetch](https://www.zero.xyz/c/watch-diff-http-headers-fetch-6a8da43d/llms.txt): $0.005/call via x402. Fetches the HTTP response headers for a given URL, returning status, redirect info, timing, and all headers without downloading the full body.
- [Watch & Diff Snapshot](https://www.zero.xyz/c/watch-diff-snapshot-1eb48951/llms.txt): $0.005/call via x402. Fetches, normalizes, hashes, and returns the content of any URL so an agent can detect changes between calls using the returned content hash.

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)