{"id":"edf49f3a-7711-4f27-bf8f-f501c1a82ab8","shortId":"CNupbp","kind":"mpp","title":"Polymarket prediction market orderbook depth via Nansen's on-chain analytics API","tagline":"Polymarket prediction market orderbook depth via Nansen's on-chain analytics API","description":"This endpoint returns the full bid/ask orderbook for a Polymarket prediction market. Data is polled from the Polymarket CLOB API approximately every 60 seconds with MD5 change detection, providing near-real-time snapshots of liquidity at each price level. The response includes market ID, outcome labels (Yes/No), asset IDs, side (buy/sell), price, size, cumulative size, and snapshot timestamp for each orderbook level.\n\nThe endpoint is part of Nansen's broader API (v1), which covers blockchain analytics including smart money tracking, wallet profiling, token screening, DEX trades, PnL analysis, and prediction market intelligence across Polymarket. It accepts a POST request with a JSON body containing a required `market_id` field and optional pagination parameters. Pricing is $0.01 per call via the x402 protocol, or 10 credits (free tier) / 1 credit (pro tier) when using Nansen's credit-based billing. Rate limits are enforced per-second and per-minute, reported via response headers.\n\nThe endpoint returned HTTP 402 on probe, confirming it is live and requires payment or API key authentication. The full OpenAPI 3.1.0 schema is available with detailed request/response models including the `OrderbookRequest` and `OrderbookResponse` schemas.","tags":["blockchain","smart-money","wallet","tokens","defi","analytics","profiler","dex","pnl","onchain","prediction-market"],"capabilities":["polymarket-orderbook","prediction-market-data","bid-ask-depth","on-chain-analytics","polymarket-clob","paginated-results","x402-payment"],"categories":["prediction-markets","blockchain"],"synonyms":["Polymarket orderbook","prediction market liquidity","Polymarket bid ask","prediction market depth","Nansen prediction market","Polymarket CLOB","orderbook snapshot"],"warnings":["No external documentation pages were accessible (docs, pricing, README all returned 404-like errors)","Example response is constructed from OpenAPI schema, not from a live API call"],"endpointUrl":"https://api.nansen.ai/api/v1/prediction-market/orderbook","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"api.nansen.ai","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.850","qualityRationale":"Full OpenAPI 3.1.0 schema with detailed request/response models is available. The endpoint returned 402 on probe confirming it is live. Pricing is clearly documented ($0.01/call via x402). Minor deduction because no crawled documentation pages were reachable beyond the root health check, and example response is inferred from schema rather than captured 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