{"uid":"cap_XxAZZCNnLbXw3l2TLMpkc","slug":"aisa-mpp-data-apis-polymarket-midpoint-price-8cdeb2f3","name":"Polymarket Midpoint Price","description":"Retrieves the midpoint price for a specific token ID. The midpoint is calculated as the average of the best bid and best ask prices.\n\n<!-- aisa-pricing:start -->\nPublished reference price: $0.012 USD per successful request. Account-specific pricing and final settlement may differ.\n<!-- aisa-pricing:end -->","url":"https://api.aisa.one/apis/v1/polymarket/midpoint?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","required":["token_id"],"properties":{"token_id":{"type":"string","description":"Token ID (asset ID)"}}},"responseSchema":{"type":"object","required":["mid_price"],"properties":{"mid_price":{"type":"string","example":"0.45","description":"Midpoint price as a string"}}},"example":null,"exampleRequest":null,"tags":["web-search","financial-data","prediction-markets","weather","travel","data","search"],"displayCostAmount":"0.012","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":"$0.012/call","primary":{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.012","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.012","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Iso5_Wmiby344FayVEbmz","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.012","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 the midpoint price (average of best bid and best ask) for a single Polymarket prediction market token by its token ID.","exampleAgentPrompt":"What's the current midpoint price for Polymarket token ID 71321045679252212594626385532706912750332728571942532289631379312455583992563?","exampleUseCases":[{"title":"Check implied probability of election outcome","prompt":"What's the current midpoint price for Polymarket token 52114319501245915516055106046884209969926127482827954674443846427813813222426? I want to know the market's implied probability."},{"title":"Track arbitrage spread across markets","prompt":"Get me the midpoint price for Polymarket token ID 71321045679252212594626385532706912750332728571942532289631379312455583992563 so I can compare it against another exchange."},{"title":"Monitor fair value before placing order","prompt":"Before I trade, can you pull the midpoint price for token 16678291189211314787145083999015737376658799626183230671758641503291735614088 on Polymarket so I know what the fair mid-market value is right now?"}],"resultDescription":"Returns a JSON object with a single field 'mid_price' as a string (e.g. '0.45'), representing the average of the current best bid and best ask prices for the specified token. This value implicitly reflects the market's consensus probability for the outcome.","failureModes":["Invalid or unknown token_id returns an error or null mid_price","Token ID for a closed or resolved market may return stale or unavailable data","Network latency may cause slightly outdated midpoint if markets are moving fast","Missing required token_id parameter results in a 400 bad request error"],"whenToPreferThis":"Use this endpoint when you need a single neutral price reference for a Polymarket token without committing to buy or sell side — ideal for fair-value estimation, implied probability calculation, or pre-trade analysis. Prefer this over the bid or ask price endpoints when you want a balanced price signal. Use the batch 'Midpoints' endpoint instead if you need prices for multiple tokens at once.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T06:48:29.604Z","isFirstParty":false,"canonicalSlug":"aisa-mpp-data-apis-polymarket-midpoint-price-8cdeb2f3"}