{"uid":"cap_WNQswB5IwZJSioxNuY2KI","slug":"hyperextend-hip-4-outcome-open-interest-per-minute-484f1632","name":"Hyperextend HIP-4 Outcome Open Interest (Per-Minute)","description":"Per-minute Hyperliquid market history: open interest, candles, trades, liquidations, HIP-3, spot and outcome markets. Query any window, pay per request over x402.","url":"https://api.hyperextend.xyz/v1/outcome/%7Boutcome%7D/oi","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"pathParams":{"type":"object","required":["outcome"],"properties":{"outcome":{"type":"string","description":"HIP-4 outcome market id (integer), e.g. 100"}}},"queryParams":{"type":"object","required":[],"properties":{"end":{"type":"integer"},"limit":{"type":"integer"},"start":{"type":"integer"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"sides":2,"minute_ts":1700000000,"oi_notional":"12345.6"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Ldc7TlwIWZCQoVzi0A8lS","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns per-minute two-sided open interest (notional) for a specified HIP-4 outcome market on Hyperliquid, queryable over any time window.","exampleAgentPrompt":"Pull the per-minute open interest history for Hyperliquid HIP-4 outcome market 100 for the last 500 data points so I can see how notional OI has been trending.","exampleUseCases":null,"resultDescription":"Returns a JSON array of per-minute records, each containing: the number of market sides, the minute-level Unix timestamp, and the notional open interest value (e.g. {sides: 2, minute_ts: 1700000000, oi_notional: '12345.6'}).","failureModes":["Invalid or non-existent outcome market ID returns 404 or empty result","Missing required path parameter 'outcome' returns 400 bad request","start/end timestamps out of valid range return empty array","Rate limiting or payment failure via x402 returns 402 Payment Required","Requesting a limit that exceeds server maximum may return truncated or error response"],"whenToPreferThis":"Use this endpoint when you need granular, per-minute open interest data specifically for HIP-4 outcome (prediction) markets on Hyperliquid. Prefer this over generic perp OI endpoints when dealing with outcome/event markets rather than standard perpetual futures.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:47:34.947Z","isFirstParty":false}