{"uid":"cap_HmpTrdx-TFtFj6ja45nAH","slug":"obol-btc-next-block-fee-estimator-ce85707d","name":"Obol BTC Next-Block Fee Estimator","description":"Returns the next-block Bitcoin fee estimate in sat/vB, along with an Ed25519 attestation for verification. Useful for fee-aware routing and transaction timing.","url":"https://obol-x402.fly.dev/v1/btc/fee/next-block","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","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_GQqnAVCZNeKbPWM3wfOWo","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a single Bitcoin next-block fee estimate in sat/vB for the fastest transaction confirmation","exampleAgentPrompt":"What's the current Bitcoin next-block fee in sat/vB? I need the fastest confirmation fee estimate so I can build my BTC transaction right now.","exampleUseCases":null,"resultDescription":"A single numeric fee rate in satoshis per virtual byte (sat/vB) representing the estimated cost to get a Bitcoin transaction confirmed in the very next block.","failureModes":["Mempool data temporarily unavailable — service may return an error or stale estimate","Network connectivity issues to the fly.dev backend may produce timeouts","Payment failure (x402) if USDC balance is insufficient or payment not processed","Rate limiting if too many calls are made in rapid succession"],"whenToPreferThis":"Choose this endpoint when you need the single fastest, simplest Bitcoin next-block fee estimate with minimal overhead. It is ideal for agents building BTC transactions that require urgent confirmation and need just one actionable sat/vB number without additional mempool context or congestion analysis. If you also need mempool congestion tier, broadcast advice, or multi-asset price data, consider the sibling bundle endpoint instead.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T13:27:33.445Z","isFirstParty":false}