{"uid":"cap_FPhM1vf1WfT9R7__ipAID","slug":"fastapi-online-open-interest-lookup-9e1ca103","name":"fastapi.online — Open Interest Lookup","description":"Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.","url":"https://api.fastapi.online/open-interest?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"symbol":{"type":"string"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","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_jZpFUOf3yTzzU5jxU-tVM","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":"Fetches open interest data for a given trading symbol from a self-hosted financial data endpoint","exampleAgentPrompt":"What's the current open interest for BTCUSDT? I want to know how much is sitting in open futures contracts right now.","exampleUseCases":[{"title":"Crypto derivatives market analysis","prompt":"Can you pull the open interest for ETHUSDT so I can see how much speculative positioning is currently in that futures market?"},{"title":"Trading signal research","prompt":"Look up the open interest for SOLUSDT — I'm trying to gauge whether the market is heavily positioned before the next price move."},{"title":"Portfolio risk monitoring","prompt":"What's the open interest right now for BTCUSDT? I want to track whether leveraged exposure is increasing or decreasing in Bitcoin futures."}],"resultDescription":"Returns open interest data for the specified trading symbol, likely including the total open interest value and possibly related contract metrics such as notional value or change over time.","failureModes":["Invalid or unsupported symbol returns an error or empty result","Payment not received results in HTTP 402 response","Server unavailable or self-hosted model offline returns 5xx error","Missing required symbol field returns validation error"],"whenToPreferThis":"Choose this endpoint when you need a pay-per-call, no-signup way to retrieve open interest data for a cryptocurrency or derivatives trading symbol, especially in crypto-native agent workflows where USDC micropayments via x402 are preferred over traditional API key subscriptions.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T06:47:44.258Z","isFirstParty":false,"canonicalSlug":"fastapi-online-open-interest-lookup-9e1ca103"}