{"uid":"cap_MY9-WoBAvBUxP74gHlVJf","slug":"blockrun-polymarket-open-interest-lookup-6c69a7ad","name":"BlockRun Polymarket Open Interest Lookup","description":"Pay for the outcome. One endpoint for every model, tool and data source an agent needs — each call priced before it runs, at the best value per dollar. 103 models and 100 data and tool APIs.","url":"https://blockrun.ai/api/v1/surf/prediction-market/polymarket/open-interest","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"condition_id":{"type":"string","description":"Required query param"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.0085","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":"$0.0085/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0085","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0085","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_0jMD6tQjntg7U4Ml7Mut6","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0085","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 specific Polymarket prediction market condition via the BlockRun routing and payment layer.","exampleAgentPrompt":"What's the current open interest for Polymarket condition 0xabc123def456? I want to know how much liquidity is locked in that market.","exampleUseCases":[{"title":"Pre-trade liquidity check","prompt":"Before I take a position, can you pull the open interest for Polymarket condition 0x3a2f1b9c4e7d8a6b to see how liquid that market is?"},{"title":"Monitoring a political market","prompt":"Check the open interest on Polymarket condition 0x9f4e2c7a1b3d8e5f — I want to track how much capital is riding on that election outcome."},{"title":"Comparing market depth across events","prompt":"Get me the open interest for Polymarket condition 0x1c8d4f2e9b7a3c6d so I can compare it with another market I'm watching."}],"resultDescription":"Returns open interest data for the specified Polymarket condition, including the total value of open positions and related market metrics, allowing agents to assess liquidity and market depth for a given prediction market event.","failureModes":["Missing or invalid condition_id returns an error or empty result","Condition ID references a closed or non-existent market","Payment failure via x402 protocol prevents the call from completing","Rate limiting or upstream Polymarket API unavailability","Malformed condition_id string format rejected by the API"],"whenToPreferThis":"Use this endpoint when you need on-chain open interest data specifically from Polymarket and are operating within a BlockRun-enabled agent stack that handles x402 micropayments in USDC. Prefer this over scraping Polymarket directly or using other prediction market APIs when you need programmatic, agent-friendly access with built-in payment settlement.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:43:33.328Z","isFirstParty":false}