Watch once ($0.10)
watch_onceRead-only
Call for a one-shot change detector: fetch a public URL, hash normalized main text (sha256), optionally compare to previous_hash. Returns hash, changed true/false/null, word_count. Use for cheap page-watch loops; not a persistent webhook subscription. Price: $0.10 USDC per call (x402 on Base) or 1 prepaid pack credit.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| url | Yes | Public http(s) URL to fingerprint | |
| previous_hash | No | sha256 from a previous watch-once call, to detect change |