{"id":"e83776c8-8154-40e2-a33e-d8ff6fcdfd70","shortId":"mZBy6p","kind":"mpp","title":"Aggregated token balances held by smart money traders and funds across multiple blockchains.","tagline":"Aggregated token balances held by smart money traders and funds across multiple blockchains.","description":"The Nansen Smart Money Holdings endpoint returns aggregated token balances currently held by sophisticated traders and funds across multiple chains (Ethereum, Solana, Base, BNB, Arbitrum, and more). It excludes whales, large holders, and influencers to focus specifically on trading expertise. Data includes 24-hour balance change tracking updated in real time, sector categorization for tokens, holder counts, market cap, token age, and share-of-holdings percentages.\n\nThe endpoint accepts a POST request with a JSON body specifying chains to analyze and optional filters such as smart money label inclusion/exclusion (Fund, Smart Trader, 30D/90D/180D Smart Trader), stablecoin/native token toggles, value ranges, holder counts, token age, market cap, and token sector. Results are paginated (up to 1000 per page) and sortable by fields like value_usd, holders_count, balance_24h_percent_change, and more.\n\nPricing is $0.05 per call via the x402 protocol. The endpoint also supports Nansen's credit system (50 credits on free tier, 5 on pro). Rate limits are enforced per-second and per-minute, reported via response headers. The API uses OpenAPI 3.1 and requires an API key in the `apiKey` header, or x402 payment via the `Payment-Signature` header.","tags":["blockchain","smart-money","wallet","tokens","defi","analytics","profiler","dex","pnl","onchain","prediction-market"],"capabilities":["smart-money-holdings","multi-chain-analytics","token-balance-aggregation","24h-balance-change","sector-categorization","smart-money-label-filtering","pagination","sorting","x402-payment"],"categories":["blockchain-analytics","defi","data"],"synonyms":["smart money token balances","nansen holdings","smart money portfolio","fund holdings","smart trader balances","blockchain wallet analytics","on-chain intelligence"],"warnings":["No external documentation pages were reachable (docs, pricing, README all returned 404-like errors); all information is derived from the OpenAPI spec.","Response schema references ($ref SmartMoneyHoldingsResponse) were not fully resolved in the probe bundle, so the example response is inferred from field descriptions in the OpenAPI spec."],"endpointUrl":"https://api.nansen.ai/api/v1/smart-money/holdings","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 ($0.05/call via x402), and a live 402 MPP challenge confirmed. Docs are embedded in the OpenAPI spec rather than external pages, and no example responses were captured from the probe, but the schema is comprehensive enough to infer them 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