{"uid":"cap_Wy1_-6CHVvG5sNvLKI7hb","slug":"fastapi-online-bitcoin-network-fee-estimator-88419bfb","name":"fastapi.online — Bitcoin Network Fee Estimator","description":"Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.","url":"https://api.fastapi.online/btc-fees?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object","required":[],"properties":{}},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.0005","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":"$0.0005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_NoIKYzaNxXDIDBuwEenzt","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns current Bitcoin network transaction fee estimates (e.g. sat/vbyte rates) for different confirmation speed targets","exampleAgentPrompt":"What are the current Bitcoin network fee rates — how many sats per vbyte should I use for a fast confirmation vs a slow one right now?","exampleUseCases":[{"title":"Optimize BTC transaction fee before sending","prompt":"Before I send this Bitcoin transaction, what fee rate should I set in sats per vbyte to get it confirmed within the next block or two?"},{"title":"Monitor Bitcoin mempool congestion","prompt":"Check the current Bitcoin network fees for me — I want to know if the mempool is congested right now and what the recommended fee tiers look like."},{"title":"Estimate BTC transfer cost for a payment app","prompt":"I'm building a Bitcoin payment flow — can you fetch the current fee estimates so I can show the user low, medium, and high priority fee options before they confirm the send?"}],"resultDescription":"Returns current Bitcoin network fee estimates, typically including recommended fee rates in satoshis per virtual byte (sat/vbyte) for different confirmation speed tiers (e.g. next block, within a few blocks, economy/slow). Useful for setting appropriate miner fees before broadcasting a transaction.","failureModes":["Service unavailable or self-hosted node offline — 5xx error","Empty or malformed request body may cause 422 validation error","Payment not included or insufficient — 402 Payment Required response","Bitcoin node data stale or out of sync — fee estimates may lag real mempool conditions","Rate limiting if payment not processed correctly"],"whenToPreferThis":"Use this endpoint when you need a quick, pay-per-call Bitcoin fee estimate without API key signup, especially in agent workflows that need real-time fee data to construct or validate BTC transactions. Prefer this over building your own mempool query when you want a simple HTTP call with crypto micropayment billing.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T04:28:27.747Z","isFirstParty":false,"canonicalSlug":"fastapi-online-bitcoin-network-fee-estimator-88419bfb"}