{"uid":"cap__qBE3zi1Q3lGw4REtJVvm","slug":"aisa-mpp-data-apis-polymarket-open-interest-lookup-de3d8ca2","name":"Polymarket Open Interest Lookup","description":"Get open interest for one or more markets.\n\n<!-- aisa-pricing:start -->\nPublished reference price: $0.00044 USD per successful request. Account-specific pricing and final settlement may differ.\n<!-- aisa-pricing:end -->","url":"https://api.aisa.one/apis/v1/polymarket/oi?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"market":{"type":"array","items":{"type":"string","example":"0xdd22472e552920b8438158ea7238bfadfa4f736aa4cee91a6b86c39ead110917","pattern":"^0x[a-fA-F0-9]{64}$","description":"0x-prefixed 64-hex string"}}}},"responseSchema":{"type":"array","items":{"type":"object","properties":{"value":{"type":"number"},"market":{"type":"string","example":"0xdd22472e552920b8438158ea7238bfadfa4f736aa4cee91a6b86c39ead110917","pattern":"^0x[a-fA-F0-9]{64}$","description":"0x-prefixed 64-hex string"}}}},"example":null,"exampleRequest":null,"tags":["web-search","financial-data","prediction-markets","weather","travel","data","search"],"displayCostAmount":"0.00044","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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":"$0.00044/call","primary":{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.00044","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.00044","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_HJkCb6qE6V-B8gu7JEkRz","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.00044","costPer":"request","priority":0,"asset":"0x20C000000000000000000000b9537d11c60E8b50","unit":"request","depositMicros":null,"planRef":null}],"brandName":"AIsa MPP Data APIs","brandSlug":"aisa-mpp-data-apis-mpp","brandBaseUrl":"https://aisa.one","brandDocsUrl":null,"whatItDoes":"Retrieves open interest values for one or more Polymarket prediction markets by their market IDs.","exampleAgentPrompt":"What's the current open interest on the Polymarket market 0xdd22472e552920b8438158ea7238bfadfa4f736aa4cee91a6b86c39ead110917?","exampleUseCases":[{"title":"Check liquidity before trading","prompt":"Before I take a position, can you tell me the open interest on Polymarket market 0xdd22472e552920b8438158ea7238bfadfa4f736aa4cee91a6b86c39ead110917 so I know how liquid it is?"},{"title":"Compare OI across multiple markets","prompt":"Can you pull the open interest for these three Polymarket markets — 0xdd22472e552920b8438158ea7238bfadfa4f736aa4cee91a6b86c39ead110917, 0xabcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890ab, and 0x1111111111111111111111111111111111111111111111111111111111111111 — so I can compare how much is at stake in each?"},{"title":"Monitor market size over time","prompt":"Keep an eye on the open interest for Polymarket market 0xdd22472e552920b8438158ea7238bfadfa4f736aa4cee91a6b86c39ead110917 and let me know if it changes significantly."}],"resultDescription":"Returns an array of objects, each containing a market ID (0x-prefixed 64-hex string) and its corresponding open interest value as a number. If multiple market IDs are queried, one object is returned per market.","failureModes":["Invalid market ID format (not a 0x-prefixed 64-hex string) returns a validation error","Market ID not found on Polymarket returns no data or zero value","Empty market array or missing parameter returns an empty array","Network or upstream Polymarket API unavailability causes request failure"],"whenToPreferThis":"Use this endpoint when you need open interest data specifically from Polymarket prediction markets, identified by their 0x-prefixed market contract addresses. It supports batch queries for multiple markets in a single call, making it efficient for comparing OI across markets. Prefer this over general market data APIs when you need Polymarket-specific OI figures for trading analysis, liquidity assessment, or monitoring.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T06:41:25.017Z","isFirstParty":false,"canonicalSlug":"aisa-mpp-data-apis-polymarket-open-interest-lookup-de3d8ca2"}