{"id":"119f1c0b-8941-4a08-a5bf-843013f578e9","shortId":"FZBv5B","kind":"mpp","title":"Detailed per-token position data for all holders in a Polymarket prediction market.","tagline":"Detailed per-token position data for all holders in a Polymarket prediction market.","description":"This endpoint returns granular position details for every holder in a specific Polymarket prediction market. For each holder, it provides token balances, buy cost, sell proceeds, average entry price, current price, unrealized value, redemption value, and per-token PnL. Positions are computed from on-chain ERC-1155 token transfers on Polygon, with SAFE proxy wallet resolution to identify actual users.\n\nThe endpoint is part of Nansen's Prediction Markets API suite. It accepts a POST request with a required `market_id` parameter and optional pagination. The response includes per-holder, per-outcome position breakdowns with fields like `balance`, `avg_entry_price`, `current_price`, `unrealized_value_usd`, `token_pnl_usd`, and market metadata such as `event_id`, `event_title`, and `market_resolved` status.\n\nPricing is $0.05 per call via the x402 protocol, or 50 credits (free tier) / 5 credits (pro tier) when using a Nansen API key. The API uses standard pagination (up to 1000 records per page) and returns rate-limit headers. Authentication is via an `apiKey` header or x402 payment.","tags":["blockchain","smart-money","wallet","tokens","defi","analytics","profiler","dex","pnl","onchain","prediction-market"],"capabilities":["prediction-market-positions","polymarket-holder-data","per-token-pnl","on-chain-position-tracking","erc1155-balance-analysis","safe-proxy-resolution","paginated-results","x402-payment"],"categories":["blockchain-analytics","prediction-markets"],"synonyms":["polymarket positions","prediction market holders","polymarket PnL","prediction market position detail","polymarket token balances","prediction market analytics","Nansen prediction market"],"warnings":["No crawled documentation pages were accessible beyond the API root health check; all /docs, /api, /pricing paths returned 404.","Response schema fields are inferred from the OpenAPI $ref to PositionDetailResponse/PositionDetailItem — actual live response not captured."],"endpointUrl":"https://api.nansen.ai/api/v1/prediction-market/position-detail","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 payment challenge confirmed live (402 on HEAD), and explicit pricing ($0.05/call). Minor deduction because no direct example response was captured from the live endpoint and component schemas are referenced but not fully resolved 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