{"uid":"cap_MN35Xh2yEALh06Phv3otk","slug":"agentstoolshub-live-bitcoin-mempool-fee-estimator-d734ea63","name":"AgentsToolsHub Live Bitcoin Mempool Fee Estimator","description":"Live Bitcoin fee market from mempool.space: recommended sat/vB tiers (fastest / 30 min / 1 hour / economy / minimum), unconfirmed-transaction backlog, and the total fee cost for your transaction's size in vBytes. No more guessing sats before broadcasting. Use this when an agent needs to live sat/vB fee tiers + cost for your tx size.","url":"https://agentstoolshub.com/api/v1/live/mempool-fees?utm_source=zero.xyz","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"],"type":"string"},"queryParams":{"type":"object","required":[],"properties":{"txSize":{"type":"number","description":"Simple transfer ≈ 140 vBytes"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_bIiftoY4VpN1HiH4mS0pt","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns live Bitcoin fee-rate tiers (sat/vB) from mempool.space plus the total fee cost for a transaction of a given size in vBytes.","exampleAgentPrompt":"What are the current Bitcoin fee tiers right now — fastest, 30-min, 1-hour, economy, and minimum sat/vB — and how much would it cost in total fees for a standard 140 vByte transaction?","exampleUseCases":[{"title":"Pre-broadcast fee check for wallet","prompt":"Before I send this Bitcoin transaction, what are the live mempool fee tiers right now and how much will a 250 vByte transaction cost at each tier?"},{"title":"Economy fee selection for non-urgent send","prompt":"I'm not in a hurry to confirm this Bitcoin payment — what's the current economy and minimum sat/vB fee rate so I can pick the cheapest option?"},{"title":"Mempool congestion monitoring","prompt":"How congested is the Bitcoin mempool right now? Show me the full fee ladder and the unconfirmed transaction backlog."}],"resultDescription":"Returns recommended fee rates in sat/vB across five tiers (fastest, ~30 min, ~1 hour, economy, minimum), the number of unconfirmed transactions in the mempool backlog, and — if txSize is provided — the calculated total fee in satoshis for that transaction size.","failureModes":["mempool.space upstream unavailable — returns an error indicating the data source is unreachable","Invalid or missing txSize type — returns a validation error if txSize is not a number","Rate limit or payment failure — returns 402 if the $0.02 USDC per-call fee is not settled"],"whenToPreferThis":"Use this endpoint when an agent needs real-time Bitcoin fee-rate recommendations sourced directly from mempool.space, especially when it also needs to compute the absolute satoshi cost for a specific transaction size before broadcasting. Prefer this over static fee tables or hardcoded defaults whenever the mempool is volatile.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T06:48:13.273Z","isFirstParty":false,"canonicalSlug":"agentstoolshub-live-bitcoin-mempool-fee-estimator-d734ea63"}