{"uid":"cap_utkTWbJHLl1TNH6Xxa5Kb","slug":"bitcoin-transaction-fee-rates-cost-estimator-9da70f57","name":"Bitcoin Transaction Fee Rates & Cost Estimator","description":"Live recommended Bitcoin transaction fee rates (in sat/vB) for next-block, ~30-minute, ~1-hour, economy and minimum confirmation targets, straight from the mempool. Also estimates the total fee (in sats and BTC) for a transaction of the given virtual size, so an agent can pick a fee tier and know the cost before broadcasting.","url":"https://chain.openverbs.com/v1/btc-fees","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","properties":{"txvBytes":{"type":"integer","default":140,"maximum":1000000,"minimum":1,"description":"Virtual size of the transaction in vbytes, used to estimate the total fee at each tier. Defaults to 140 (a typical 1-in/2-out native-segwit spend)."}},"additionalProperties":false},"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":"0.006","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":"$0.006/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.006","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.006","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_C24crHzd3h9jkzvjpGGXk","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.006","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns live recommended Bitcoin fee rates (sat/vB) for five confirmation-speed tiers and estimates total fee cost for a transaction of a given virtual size.","exampleAgentPrompt":"What are the current Bitcoin fee rates for each confirmation speed, and how much would a 250 vbyte transaction cost in sats and BTC if I go with the next-block tier?","exampleUseCases":[{"title":"Wallet fee picker before broadcast","prompt":"Before I send this Bitcoin transaction, what fee rate should I use to get confirmed within 30 minutes, and how much will it cost total for a 192 vbyte transaction in both sats and BTC?"},{"title":"Fee monitoring for cost-sensitive send","prompt":"I'm in no rush — what's the economy fee rate for Bitcoin right now, and what would the total fee be for a standard 140 vbyte transaction?"},{"title":"Next-block urgency fee check","prompt":"I need this Bitcoin payment confirmed in the next block — what's the current fastest fee rate in sat/vB and what's the estimated total cost for a 300 vbyte transaction?"}],"resultDescription":"A structured response containing recommended fee rates in sat/vB for five tiers (next-block, ~30-minute, ~1-hour, economy, minimum), plus the estimated total fee in satoshis and BTC for a transaction of the requested virtual size at each tier, sourced live from the Bitcoin mempool.","failureModes":["txvBytes out of range (below 1 or above 1,000,000) returns a validation error","Mempool data temporarily unavailable returns a 503 or error response","Malformed request body returns a 400 bad request","Network timeout if mempool source is slow to respond"],"whenToPreferThis":"Use this endpoint when an agent needs to make fee-tier decisions before constructing or broadcasting a Bitcoin transaction, or when a user wants to know the real-time cost of sending Bitcoin at different confirmation speeds. It is purpose-built for Bitcoin fee estimation with per-tier breakdown and cost calculation in a single call, making it preferable to generic blockchain explorers that may not provide multi-tier fee estimates or cost projections.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:31:38.432Z","isFirstParty":false}