{"uid":"cap_Y2ME2VG6Qlhl-h1C_Kfb-","slug":"bykaranteli-vpin-flow-toxicity-bbb9e782","name":"ByKaranteli VPIN Flow Toxicity","description":"Order flow toxicity (VPIN) HISTORY for BTC, ETH and SOL: 90-day daily VPIN track with closes plus the last 500 volume buckets .","url":"https://bykaranteli.com/api/x402/flow-vpin","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"ok":true,"rows":[{"vpin":0.31,"symbol":"BTCUSDT","percentile_90d":62.5}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_cPPxvgSFbrD6ivkWoaF7e","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns 90-day daily VPIN history with closes, last 500 volume buckets, and a live snapshot for BTC, ETH, or SOL order flow toxicity analysis","exampleAgentPrompt":"Pull the full 90-day VPIN history for BTC including daily closes and the last 500 volume buckets so I can assess order flow toxicity trends.","exampleUseCases":[{"title":"Detecting informed trading before major move","prompt":"Fetch me the 90-day daily VPIN history for ETH with the last 500 volume buckets — I want to see if order flow toxicity was elevated before recent price swings."},{"title":"Real-time crypto flow toxicity dashboard","prompt":"Get the current VPIN snapshot plus the full daily history for SOL so I can update my flow toxicity dashboard with the latest data."},{"title":"Quant strategy backtesting with VPIN","prompt":"I need the 90-day VPIN track for BTC including all daily closes and volume bucket data to backtest a market-making strategy that fades toxic flow."}],"resultDescription":"Returns a JSON payload containing: (1) a live VPIN snapshot, (2) 90 days of daily VPIN values with corresponding price closes, and (3) the last 500 volume buckets used in VPIN computation — all for the requested asset (BTC, ETH, or SOL).","failureModes":["Unsupported asset symbol returns error (only BTC, ETH, SOL supported)","Payment failure if x402 USDC payment of $0.002 is not properly submitted","Rate limiting if too many requests in short succession","Stale or delayed data if upstream exchange feeds are interrupted"],"whenToPreferThis":"Choose this endpoint when you need deep historical VPIN data (90-day daily track + 500 volume buckets) for BTC, ETH, or SOL — especially for backtesting, quantitative analysis, or building a flow toxicity dashboard. For a free live-only snapshot without history, use the public /api/public/flow endpoint instead. Prefer this over generic order book APIs when you specifically need volume-synchronized probability of informed trading (VPIN) methodology.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:39:14.681Z","isFirstParty":false}