{"slug":"alphapipeline-eu-onrender-com-v1-prediction-hip4-alerts-subs-bcc31c","title":"[EXPERIMENTAL] Subscribe a webhook to receive push notifications when a HIP-4 ou","host":"alphapipeline-eu.onrender.com","method":"GET","resource":"https://alphapipeline-eu.onrender.com/v1/prediction/hip4-alerts/subscribe","category":"market","description":"[EXPERIMENTAL] Subscribe a webhook to receive push notifications when a HIP-4 outcome's probability jumps past a configurable threshold, or a new market appears - so an agent no longer has to poll hip4-snapshot itself. Polls Hyperliquid every ~5 minutes; not a true real-time feed. GET with query par","price_listed":0.02,"price_asked":0.02,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":310,"reported_calls_30d":0,"reported_payers_30d":0,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"method":"GET","queryParams":{"event_types":["hip4.prob_jump"],"secret":"replace-with-your-own-32-byte-random-secret","underlying":"BTC","webhook_url":"https://example.com/webhooks/alphapipeline"},"type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"properties":{"event_types":{"description":"Subset of event types to receive (default: all). See GET hip4-alerts/event-types.","items":{"type":"string"},"type":"array"},"secret":{"description":"Caller-generated shared secret (>=16 chars) used to HMAC-SHA256 sign each delivery. Not stored anywhere you can retrieve it later - keep your own copy. Travels in the URL query string (GET) - see the endpoint description.","type":"string"},"threshold_pct":{"description":"Optional per-subscription override of the prob_jump threshold (0.0-1.0 scale).","type":"number"},"underlying":{"description":"Optional filter: only this crypto underlying's markets (e.g. 'BTC').","type":"string"},"webhook_url":{"description":"https:// endpoint to receive signed POST deliveries. Private/loopback IPs are rejected.","format":"uri","type":"string"}},"required":["webhook_url","secret"],"type":"object"},"type":{"const":"http","type":"string"}},"required":["type","method"],"type":"object"},"output":{"properties":{"example":{"properties":{"created_at":{"title":"Created At","type":"number"},"event_types":{"items":{"type":"string"},"title":"Event Types","type":"array"},"expires_at":{"title":"Expires At","type":"number"},"notice":{"title":"Notice","type":"string"},"status":{"title":"Status","type":"string"},"subscription_id":{"title":"Subscription Id","type":"string"},"threshold_pct":{"anyOf":[{"type":"number"},{"type":"null"}],"default":null,"title":"Threshold Pct"},"underlying":{"anyOf":[{"type":"string"},{"type":"null"}],"default":null,"title":"Underlying"},"webhook_url":{"title":"Webhook Url","type":"string"}},"required":["subscription_id","webhook_url","event_types","status","created_at","expires_at","notice"],"title":"Hip4AlertsSubscribeResponse","type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-09-30","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.02,"price_match":true,"latency_ms":310,"error":null}],"description_full":"[EXPERIMENTAL] Subscribe a webhook to receive push notifications when a HIP-4 outcome's probability jumps past a configurable threshold, or a new market appears - so an agent no longer has to poll hip4-snapshot itself. Polls Hyperliquid every ~5 minutes; not a true real-time feed. GET with query params, not JSON body - secret travels in the URL. See free GET /v1/prediction/hip4-alerts/event-types for the event catalog. Paid in USDC on Base.","last_updated":"2026-09-30T16:45:48.776Z","schemes":["exact"]}