{"uid":"cap_QTXXqjsnYO7BXa3dSwYQQ","slug":"fastpath-bitcoin-mempool-fee-estimator-d9338b64","name":"FastPath Bitcoin Mempool Fee Estimator","description":"FastPath translates Ethereum-style JSON-RPC requests into Bitcoin data, fee intelligence, mempool insight, and Core v31 package signals. Paid by x402.","url":"https://api.nativebtc.org/v1/mempool/fees","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{"target":{"type":"number","minimum":1,"description":"Target confirmation window in blocks."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"target":10,"success":true,"histogram":[{"txs":12000,"bucket":"1-2"}],"recommendedSatVb":1}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_OjOx25GRzYGe02g6JIun5","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns recommended Bitcoin fee rates (sat/vB) and fee histogram data for a specified confirmation target window","exampleAgentPrompt":"What fee rate in sat/vB should I use to get my Bitcoin transaction confirmed within 10 blocks, and can you show me the mempool fee histogram?","exampleUseCases":null,"resultDescription":"Returns a JSON object with the recommended fee rate in satoshis per vByte for the requested confirmation target, a success flag, the target block count, and a histogram array showing transaction volume bucketed by fee range.","failureModes":["Invalid target parameter (below minimum of 1 block) returns validation error","Network unavailable or mempool data stale returns error response","Payment not processed via x402 protocol results in 402 Payment Required","Target confirmation window too large may return no data"],"whenToPreferThis":"Use this endpoint when you need to estimate Bitcoin transaction fees based on current mempool conditions, especially when you want both a specific recommended sat/vB rate and a histogram of fee distribution. Prefer this over generic fee APIs when you need Core v31-aligned fee intelligence with Ethereum-style JSON-RPC compatibility.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:40:52.837Z","isFirstParty":false}