{"uid":"cap_G_lzz8V5VGRYS3yeTddx2","slug":"bitcoin-transaction-fee-rates-mempool-congestion-7b52950e","name":"Bitcoin Transaction Fee Rates & Mempool Congestion","description":"Recommended Bitcoin transaction fee-rates in sat per vByte across five confirmation horizons (fastest, half hour, hour, economy, minimum) plus a live mempool congestion snapshot with an estimated block backlog. Informational, not advice.","url":"https://api.agentstools.dev/btc/fees","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","required":[],"properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_wJZQZiOJ4sOTbtH3eGiru","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns recommended Bitcoin transaction fee rates in sat/vByte across five confirmation speed tiers plus a live mempool congestion snapshot with estimated block backlog.","exampleAgentPrompt":"What are the current Bitcoin fee rates — fastest, economy, and minimum — and is the mempool congested right now? I want to know how many blocks are backlogged.","exampleUseCases":null,"resultDescription":"Returns five fee-rate tiers (fastest, half-hour, hour, economy, minimum) each expressed in satoshis per virtual byte, plus a live mempool congestion indicator and an estimated number of blocks currently backlogged waiting for confirmation.","failureModes":["Upstream Bitcoin node or mempool data source is unavailable — returns 5xx error","Payment not received or invalid x402 payment header — returns 402 Payment Required","Rate limit exceeded — returns 429 Too Many Requests","Mempool data may be slightly stale if the underlying data source lags"],"whenToPreferThis":"Choose this endpoint when an agent needs current Bitcoin fee recommendations across multiple confirmation horizons in a single call, especially when building transaction fee UIs, wallets, or automated Bitcoin transaction submission workflows. Prefer over generic blockchain explorers when you specifically need multi-tier fee estimates plus mempool congestion context in one response.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:32:05.350Z","isFirstParty":false}