{"id":"1a464cc8-24a0-47da-8e12-1f1671a1808d","shortId":"Df6vSV","kind":"mpp","title":"Browse and filter Polymarket prediction market events with aggregated volume, liquidity, and trader data via Nansen.","tagline":"Browse and filter Polymarket prediction market events with aggregated volume, liquidity, and trader data via Nansen.","description":"This endpoint screens Polymarket prediction market events (groups of related markets) through the Nansen API. It returns aggregated metrics across all markets within each event, including total volume (24h, 1 week, 1 month, all-time), total liquidity, total open interest, unique trader counts, and nested per-market data with bid/ask prices and price changes.\n\nThe endpoint accepts POST requests with a JSON body supporting filters for search query, active/closed status, tags, liquidity range, volume thresholds, open interest bounds, neg-risk framework, end-date windows, and pagination. Results can be sorted by volume, liquidity, open interest, unique traders, or age. The API uses a credit-based system: 10 credits (free tier) or 1 credit (pro tier) per call, with an x402 pay-per-request option at $0.01 per call. Rate limits are enforced per-second and per-minute, reported via response headers.\n\nNansen is a blockchain analytics platform providing smart money intelligence, wallet profiling, and on-chain flow analysis. This specific endpoint is part of the Prediction Markets module, which covers Polymarket data decoded from on-chain Polygon events. Authentication is via an `apiKey` header. The endpoint returned HTTP 402 on probe, confirming it is live and supports the x402 payment protocol.","tags":["blockchain","smart-money","wallet","tokens","defi","analytics","profiler","dex","pnl","onchain","prediction-market"],"capabilities":["prediction-market-screening","polymarket-event-data","event-volume-aggregation","liquidity-filtering","open-interest-filtering","tag-based-filtering","pagination","sort-by-volume","sort-by-liquidity","x402-payment"],"categories":["blockchain","prediction-markets","search"],"synonyms":["polymarket events","prediction market screener","polymarket event screener","prediction market analytics","polymarket volume","event screening","prediction market events API","nansen prediction markets"],"warnings":["No external documentation pages were reachable beyond the API root health check; all information is derived from the OpenAPI spec.","The probe returned 402 via HEAD method, confirming the endpoint is live but no sample response body was captured."],"endpointUrl":"https://api.nansen.ai/api/v1/prediction-market/event-screener","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"api.nansen.ai","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.880","qualityRationale":"Full OpenAPI 3.1 schema with detailed request/response models, clear pricing ($0.01 per call via x402), credit costs documented, and the endpoint confirmed live via 402 probe. Minor deductions: no crawled external docs beyond the API root, and component schemas for EventScreenerRequest/Response reference sub-schemas not fully expanded 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