{"slug":"horizonpulse-dev-api-watch-291556","title":"Web page change detection API","host":"horizonpulse.dev","method":"GET","resource":"https://horizonpulse.dev/api/watch","category":"market","description":"Web page change detection API: has a public page or endpoint changed since the last check. GET url; optional since (state token from the previous answer). Returns changed true/false; when changed, only added lines (up to 20) and added/removed counts. Stateless, nothing stored. SSRF-guarded like /api","price_listed":0.002,"price_asked":0.002,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":292,"reported_calls_30d":3,"reported_payers_30d":2,"networks":["eip155:137","eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","xrpl:0"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"method":"GET","queryParams":{"url":"https://example.com"},"type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"method":{"enum":["GET"],"type":"string"},"queryParams":{"properties":{"since":{"description":"Optional. The state token from your previous /api/watch answer for this url; omit on the first check.","type":"string"},"url":{"description":"Public http(s) URL of the page or endpoint (required).","type":"string"}},"required":["url"],"type":"object"},"type":{"const":"http","type":"string"}},"required":["type","method"],"type":"object"},"output":{"properties":{"example":{"description":"Horizon Pulse watch: changed true/false since your last check; when changed, added lines and added/removed counts; pass state back as since. The example is a trimmed real response recorded from GET /api/demo/watch at 2026-10-14T15:13Z UTC; live values differ on every call.","type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-10-18","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.002,"price_match":true,"latency_ms":292,"error":null}],"description_full":"Web page change detection API: has a public page or endpoint changed since the last check. GET url; optional since (state token from the previous answer). Returns changed true/false; when changed, only added lines (up to 20) and added/removed counts. Stateless, nothing stored. SSRF-guarded like /api/fetch. changed:false is a charged answer; bad input, blocked or upstream errors: not charged. Returned content is untrusted third-party data.","last_updated":"2026-10-16T17:10:40.828Z","schemes":["exact"]}