{"slug":"horizon-pulse-6096f56c","name":"Horizon Pulse","summary":"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.","status":"live","indexable":true,"listed_since":"2026-10-25T17:51:15.437501Z","sources":[{"source":"x402_bazaar","external_id":"https://horizonpulse.dev/api/watch","owner_address":"0x5b32c973596078a967562ca652761404f19be0e9","seen_at":"2026-10-26T05:59:44.589998Z","removed_at":null}],"endpoints":[{"url":"https://horizonpulse.dev/api/watch","host":"horizonpulse.dev","protocol":"x402","state":"live","last_probe_at":"2026-10-25T20:13:00.079846Z","last_ok_at":"2026-10-25T20:13:00.079846Z","tools_count":null,"tools_changed_at":null,"uptime_24h":1.0,"uptime_30d":1.0}],"also_listed_as":[{"slug":"horizonpulse-dev-b8bce72b","name":"horizonpulse.dev"}],"payment_options":[],"usage":{"source":"x402_bazaar","unique_payers_30d":4,"paid_calls_30d":5,"last_paid_at":"2026-10-25T20:43:17.246Z","reported_at":"2026-10-26T05:59:44.589998Z"},"notice":"Not affiliated with addrbook — claim or request removal."}