{"uid":"cap_Li-vOAKhYANnH7HDxG2jn","slug":"fastpath-api-bitcoin-mempool-stats-de423d6c","name":"FastPath API – Bitcoin Mempool Stats","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/stats","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"fees":{"day":1,"nextBlock":2,"sixBlocks":1},"size":33741,"fullrbf":true,"success":true,"congestion":"medium"}},"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_bKspp84YasKJaYxSPUeTC","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 current Bitcoin mempool statistics including size, fee estimates by time horizon, RBF status, and network congestion level.","exampleAgentPrompt":"What are the current Bitcoin mempool fees and how congested is the network right now — I need to know if I should send my transaction immediately or wait?","exampleUseCases":[{"title":"Optimal fee selection before sending BTC","prompt":"I'm about to send a Bitcoin transaction — what fee rate should I use if I want it confirmed in the next block, and how congested is the mempool right now?"},{"title":"Mempool congestion monitoring for an exchange","prompt":"Check the Bitcoin mempool stats and tell me if the network is congested — I need the current size, congestion level, and whether full-RBF is active."},{"title":"Fee-sensitive wallet advice","prompt":"What's the cheapest fee I can pay to get my Bitcoin transaction confirmed within 24 hours, and what's the current mempool size?"}],"resultDescription":"A JSON object containing: fee estimates in sat/vB for next block, 6-block, and 1-day horizons; current mempool size in bytes; a boolean indicating whether full-RBF is enabled; a congestion label (e.g. 'medium'); and a success flag.","failureModes":["Service unavailable (upstream Bitcoin node unreachable) — returns error or non-200 status","Payment not settled (x402 micropayment rejected) — returns 402 Payment Required","Rate limiting if too many requests are made in a short window","Stale data if the underlying node is syncing or lagging"],"whenToPreferThis":"Use this endpoint when you need real-time Bitcoin mempool statistics — especially fee estimates across multiple confirmation-time horizons and a congestion signal — without running your own Bitcoin node. It is particularly suited for Ethereum-ecosystem developers already familiar with JSON-RPC conventions who want Bitcoin data in a compatible format. Prefer this over raw mempool.space or Bitcoin Core RPC if you want a unified, metered, pay-per-call API with congestion labeling included.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:39:24.096Z","isFirstParty":false}