{"uid":"cap_jBvSszZd9mioIQ9c2kECI","slug":"api-carbon-cashmere-de-8bc1b3f6","name":"Bitcoin Fee Market Analytics API","description":"Professional crypto market intelligence. Real-time prices, signals, and market scoring.","url":"https://api.carbon-cashmere.de/v1/bitcoin/fee-market","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"_meta":{"disclaimer":"Informational research data only — not investment advice."},"mempool":{"size_mb":1.86,"pressure":"low","tx_count":5976,"fee_trend":"stable"},"fee_elasticity":2,"blocks_analyzed":144,"fee_current_satvb":{"3_block_satvb":1,"6_block_satvb":1,"144_block_satvb":1,"next_block_satvb":2},"fee_historical_over_blocks":{"segwit_pct_median":0.91,"feerate_median_p50":3.2,"feerate_median_p90":12.4}}},"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":"down","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_dU3hu3tuOFS9--cmql087","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns current Bitcoin mempool fee-tier estimates for 1/3/6/12/24/144-block confirmations plus historical fee percentiles, SegWit adoption, UTXO delta, and fee elasticity metric","exampleAgentPrompt":"What are the current Bitcoin mempool fee estimates for 1-block and 144-block confirmation targets, and what does the fee elasticity ratio look like right now — plus SegWit adoption and UTXO delta?","exampleUseCases":[{"title":"Optimize wallet sweep transaction costs","prompt":"Check the current Bitcoin fees for a 12-block confirmation target and show me the historical 25th percentile over the last hundred blocks so I can batch my wallet sweep efficiently without overpaying."},{"title":"Monitor mempool congestion trends","prompt":"What's the fee elasticity looking like right now, and how does today's 50th percentile compare to the 90th percentile over the past few blocks? I want to know if the mempool is getting more competitive."},{"title":"SegWit adoption and fee market health","prompt":"Pull the current SegWit adoption percentage along with the 6-block and 24-block fee estimates — I need to assess network efficiency and decide whether to recommend SegWit to my users based on actual fee savings."}],"resultDescription":"A JSON object containing: current mempool fee estimates in sat/vB for 1, 3, 6, 12, 24, and 144-block confirmation targets; historical fee percentiles (10th, 25th, 50th, 75th, 90th) over the last N blocks; a fee elasticity metric (next-block / 144-block ratio) indicating current price sensitivity; current SegWit adoption percentage; and UTXO set delta. All data is node-backed and labeled as informational research.","failureModes":["Node connectivity issue — Bitcoin node unreachable, returns 503 or timeout","Invalid query parameters — returns 400 with validation error","Payment not processed — x402 payment required before data is returned","Rate limit exceeded — too many requests in short window, returns 429","Historical N blocks parameter out of range — returns 400 if N exceeds max allowed"],"whenToPreferThis":"Choose this endpoint when you need a comprehensive, node-backed snapshot of the Bitcoin fee market combining real-time mempool fee tiers with historical percentile context and fee elasticity, SegWit adoption, and UTXO delta — all in one call. Prefer this over generic blockchain explorers when you need structured analytics for fee estimation decisions, mempool research, or trend monitoring.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:58:02.049Z","isFirstParty":false}