{"id":"7ff5dacf-3166-4c05-b10a-04efd13d5df4","shortId":"ceHF8Q","kind":"mpp","title":"Get top position holders for Polymarket prediction markets with entry prices, PnL, and whale positioning.","tagline":"Get top position holders for Polymarket prediction markets with entry prices, PnL, and whale positioning.","description":"This endpoint returns the largest position holders for a specific Polymarket prediction market. Positions are computed from on-chain ERC-1155 token transfers on Polygon, with SAFE proxy wallet resolution to identify actual users. The response includes each holder's address, position size, average entry price, current price, unrealized PnL in USD, and which side (Yes/No) they hold.\n\nThe endpoint is part of Nansen's broader Prediction Markets API suite, which covers Polymarket analytics including OHLCV candles, orderbooks, trades, PnL leaderboards, and market/event screeners. It accepts a POST request with a JSON body containing a `market_id` (the Polymarket market identifier), optional pagination, and optional sort order (by position_size, unrealized_pnl_usd, or avg_entry_price). The endpoint costs 50 credits on the free tier or 5 credits on the pro tier per call, and also supports x402 pay-per-request at $0.05 per call. Rate limits are enforced per-second and per-minute, reported via response headers.","tags":["blockchain","smart-money","wallet","tokens","defi","analytics","profiler","dex","pnl","onchain","prediction-market"],"capabilities":["polymarket-top-holders","prediction-market-analytics","on-chain-position-tracking","whale-detection","pnl-analysis","erc1155-polygon","safe-proxy-resolution","pagination","sorting"],"categories":["blockchain-analytics","prediction-markets"],"synonyms":["polymarket holders","prediction market whales","polymarket positions","polymarket top traders","prediction market top holders","polymarket whale tracker","nansen prediction market"],"warnings":["No dedicated documentation site was reachable (docs pages returned 404/route-not-found); all information derived from OpenAPI spec.","Response schema references TopHolder and TopHoldersResponse but full field-level examples are inferred from schema defaults, not live responses."],"endpointUrl":"https://api.nansen.ai/api/v1/prediction-market/top-holders","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 endpoint description, x402 pricing ($0.05/call), and credit costs documented. The 402 MPP challenge confirms the endpoint is live. Minor deduction because no actual response sample was captured from the probe (only schema-level examples) and crawled docs pages returned 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