{"uid":"cap_slX2qHWqyur3miYq5X3ro","slug":"bitcoin-mempool-pressure-state-projected-next-blocks-7bbb3733","name":"Bitcoin Mempool Pressure State & Projected Next Blocks","description":"Bitcoin mempool pressure state and projected next blocks. Class (low/normal/high/extreme) is determined deterministically: extreme if next block median fee >= 50 sat/vB or backlog >= 150 vMB; high if >= 20 sat/vB or >= 60 vMB; normal if >= 3 sat/vB or >= 10 vMB; low otherwise.","url":"https://api.chainmarket-api.workers.dev/api/crypto/btc-mempool-pressure?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":{"maxBlocks":{"type":"string","description":"Maximum projected blocks to return (1-10, default 8)"}}}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/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_ErDvE7cjdGB8lYeOMmkwW","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 the current Bitcoin mempool congestion class (low/normal/high/extreme) and fee projections for upcoming blocks based on backlog and median fee thresholds","exampleAgentPrompt":"What's the current Bitcoin mempool pressure level right now — is it low, normal, high, or extreme — and show me the projected fee rates for the next 5 blocks?","exampleUseCases":[{"title":"Optimal fee timing for BTC send","prompt":"I'm about to send some Bitcoin — can you check whether the mempool is congested right now and tell me if I should wait or go ahead, and what fee rate to use?"},{"title":"Automated mempool alert dashboard","prompt":"Check the Bitcoin mempool pressure state and projected next 10 blocks so I can display it on my crypto dashboard — I need the congestion class and the fee estimates."},{"title":"DCA bot pre-send fee check","prompt":"Before my recurring Bitcoin purchase goes out, check if the mempool pressure is extreme or high — I only want to broadcast the transaction if it's normal or low congestion."}],"resultDescription":"Returns the current mempool pressure classification (low, normal, high, or extreme) determined by deterministic thresholds on median fee rate (sat/vB) and backlog size (vMB), along with projected fee data for upcoming Bitcoin blocks (up to the requested maxBlocks count, default 8).","failureModes":["Upstream Bitcoin node unavailability may cause 503 or empty response","Invalid maxBlocks value outside 1-10 range may return a 400 error","Network timeouts if the mempool data feed is slow","Stale data if the underlying node is syncing or lagging"],"whenToPreferThis":"Choose this endpoint when you need a deterministic, pre-classified mempool pressure label (low/normal/high/extreme) plus projected next-block fee rates for Bitcoin, especially when you want a single API call that combines congestion state and fee projection rather than raw mempool stats. Ideal for agents making send/no-send decisions, fee optimization workflows, or user-facing dashboards that need actionable status labels rather than raw numbers.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-11-02T12:31:24.571Z","isFirstParty":false,"canonicalSlug":"bitcoin-mempool-pressure-state-projected-next-blocks-7bbb3733"}