{"uid":"cap_apcmYx0qYdEKSirf14QiF","slug":"data-crestsystems-ai-34637a69","name":"Crest Mempool State","description":"Crest · mempool — Fetch current mempool state across chains. Returns Bitcoin pending transaction count, fee histogram, and Base pending transaction count.","url":"https://data.crestsystems.ai/data/mempool","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","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":{"request":{"input":{"type":"http","method":"GET","queryParams":{}}},"response":{"paid":true,"price":"$0.002","mempool":{"base":{"pending_txs":191},"bitcoin":{"count":98033,"vsize":38837126,"total_fee":11250390,"fee_histogram":[[6.041237,50013],[4.066206,60833],[3.124424,50146],[3.0328233,51297],[3.0317318,71491]]}}}},"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_BAXFUqHZXo7xm_Vx0FWWq","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns current Bitcoin and Base blockchain mempool state including pending transaction counts and Bitcoin fee histogram","exampleAgentPrompt":"What's the current state of the Bitcoin mempool — how many transactions are pending and what does the fee histogram look like right now? Also check the Base chain pending TX count.","exampleUseCases":null,"resultDescription":"Returns current mempool snapshot including Bitcoin pending transaction count, a fee histogram (showing fee rate distribution across pending transactions), and Base chain pending transaction count — useful for estimating confirmation times and appropriate fee levels.","failureModes":["Upstream blockchain node unavailability may return 503 or empty data","Stale data if mempool indexer is lagging behind chain tip","Payment failure (402) if x402 USDC payment not attached or insufficient","Rate limiting if called too frequently without valid payment"],"whenToPreferThis":"Use this endpoint when you need real-time mempool depth data for both Bitcoin and Base in a single call, particularly when deciding on transaction fee levels, estimating confirmation times, or monitoring network congestion. Prefer over on-chain RPC calls when you need a quick, no-setup fee histogram without running your own node.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T16:27:07.364Z","isFirstParty":false}