{"uid":"cap_B6LwHP3pOXFyTryEPI76a","slug":"bitcoin-fee-estimates-api-sat-vb-dd764ec4","name":"Bitcoin Fee Estimates API (sat/vB)","description":"Bitcoin fee estimates (sat/vB) per confirmation target from blockstream.info - send-cost planning for BTC agents and treasury bots","url":"https://money-reactor.makar52nn2016.workers.dev/api/btc-fees?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"input":{"type":"object","properties":{"queryParams":{"type":"object","properties":{}}}},"output":{"type":"object","properties":{"example":{"ok":true,"price_usd":"0.10","description":"Bitcoin fee estimates (sat/vB) per confirmation target from blockstream.info - send-cost planning for BTC agents and treasury bots"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.1","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":"$0.1/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_0nR8B6jEhwp4eIGXu2rzH","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.1","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns Bitcoin transaction fee estimates in satoshis per vByte for multiple confirmation targets, sourced from Blockstream.info","exampleAgentPrompt":"What are the current Bitcoin fee rates in sat/vB for fast, medium, and slow confirmation targets so I can decide how much to pay for my transaction?","exampleUseCases":[{"title":"Treasury bot send-cost planning","prompt":"Before I send this Bitcoin payment from the treasury, check the current sat/vB fee estimates so we can pick the right fee tier to confirm within the next block without overpaying."},{"title":"User-facing BTC wallet fee suggestion","prompt":"My app needs to show users the current Bitcoin fee options — can you pull the latest fee rates in sat/vB for 1-block, 3-block, and 6-block confirmation targets?"},{"title":"Automated fee alerting for low-cost windows","prompt":"Check the current Bitcoin network fee rates and let me know if the fast-confirmation sat/vB rate has dropped below 20 so I can schedule my BTC transfer now."}],"resultDescription":"Returns a JSON object with Bitcoin fee estimates expressed in satoshis per vByte (sat/vB) for various confirmation targets (e.g. next block, within 3 blocks, within 6 blocks), sourced live from Blockstream.info. Useful for determining the appropriate fee to attach to a Bitcoin transaction based on urgency.","failureModes":["Blockstream.info upstream outage returns error or stale data","Network timeout on the Cloudflare Worker proxy","Rate limiting or payment failure returns 402","Mempool data may be momentarily stale during high-congestion periods"],"whenToPreferThis":"Use this endpoint when you need real-time Bitcoin fee estimates in sat/vB for send-cost planning, treasury automation, or user-facing wallet fee suggestions. Prefer this over raw mempool APIs when you want a simple, pre-parsed fee schedule without standing up your own Bitcoin node or Blockstream integration. Best suited for agents and bots that need a quick, pay-per-call fee lookup without managing API keys.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:40:04.844Z","isFirstParty":false,"canonicalSlug":"bitcoin-fee-estimates-api-sat-vb-dd764ec4"}