{"uid":"cap_L15PSZ83-E-5m2y6rdIuD","slug":"fastapi-online-btc-mempool-lookup-1a8af5cd","name":"fastapi.online — BTC Mempool Lookup","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-mempool?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":"unknown","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_0pBBGn7kxvQH6_gKgvCYp","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":"Queries the Bitcoin mempool for pending transaction data and network state via a self-hosted utility endpoint.","exampleAgentPrompt":"Can you check the current Bitcoin mempool status for me — how congested is it right now and what are the pending transaction counts?","exampleUseCases":[{"title":"Check BTC network congestion","prompt":"How congested is the Bitcoin network right now? I want to know how many unconfirmed transactions are in the mempool before I send a transaction."},{"title":"Estimate Bitcoin transaction fees","prompt":"What does the Bitcoin mempool look like right now? I'm trying to figure out if fees are high or low before I make a BTC transfer."},{"title":"Monitor mempool for trading bot","prompt":"Pull the current Bitcoin mempool data for me — I need to know the size and state of the mempool to decide whether to trigger my on-chain transaction now or wait."}],"resultDescription":"Returns current Bitcoin mempool data including pending/unconfirmed transaction counts, mempool size, and potentially fee rate estimates or network congestion indicators.","failureModes":["Empty or malformed POST body may return 400 or 422 validation error","Upstream Bitcoin node unavailable may return 503 or timeout","Payment not included or invalid x402 payment header returns 402 Payment Required","Rate limiting or node sync issues may return stale or partial data"],"whenToPreferThis":"Choose this endpoint when you need a quick, pay-per-call, no-signup lookup of Bitcoin mempool state — especially useful for agents that occasionally need BTC network data without maintaining a full node or a subscription to a blockchain data provider.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-16T06:50:02.670Z","isFirstParty":false,"canonicalSlug":"fastapi-online-btc-mempool-lookup-1a8af5cd"}