{"uid":"cap__dkSecoe5HIRxHarrXK4N","slug":"satoshi-api-bitcoin-fee-observatory-estimates-477276f1","name":"Satoshi API - Bitcoin Fee Observatory Estimates","description":"Know when to send Bitcoin and when to wait. Satoshi API gives apps and AI agents live fee recommendations, mempool context, and cost estimates. Free, open source.","url":"https://bitcoinsapi.com/api/v1/fees/observatory/estimates","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","schema":{"type":"object","properties":{"ok":{"type":"boolean"},"source":{"type":"string"}}},"example":{"ok":true,"source":"satoshi-api"},"mimeType":"application/json"},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_7XHSOGS9GvXZpwZu0vtjj","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns live Bitcoin fee recommendations, mempool context, and transaction cost estimates to help apps and agents decide when to send BTC","exampleAgentPrompt":"What's the current Bitcoin fee recommendation — should I send my transaction now or wait, and what sat/vbyte rate should I use for a fast confirmation?","exampleUseCases":[{"title":"Smart wallet fee auto-selection","prompt":"I'm about to send some Bitcoin from my wallet — check the current mempool and tell me what fee rate I should use to get confirmed in the next block without overpaying."},{"title":"DCA bot timing optimization","prompt":"My Bitcoin DCA bot is about to broadcast a transaction — pull the current fee estimates and tell me if fees are low enough to send now or if I should wait a bit for cheaper confirmation."},{"title":"Bitcoin payment processor cost check","prompt":"Before I trigger this Bitcoin payout, can you check the Satoshi API fee observatory and tell me the estimated cost in sats and whether the network is congested right now?"}],"resultDescription":"A JSON object with a boolean 'ok' status and a 'source' identifier, along with live fee rate estimates (sat/vbyte) for different priority tiers (e.g. fast, standard, slow), mempool congestion context, and estimated transaction cost — helping the caller decide when and at what fee to broadcast a Bitcoin transaction.","failureModes":["Network timeout if mempool data provider is slow or unavailable","Returns ok:false if the fee data cannot be fetched","Invalid or malformed input properties may result in a 400 error","Rate limiting if called too frequently without payment","Stale data if mempool snapshot is momentarily delayed"],"whenToPreferThis":"Choose this endpoint when an AI agent or app needs real-time Bitcoin fee intelligence — specifically when building Bitcoin wallets, payment processors, or automation bots that need to decide the optimal sat/vbyte rate or whether to delay a transaction. Prefer this over generic blockchain explorers when you need structured, AI-agent-friendly fee recommendations rather than raw mempool data.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T16:25:40.153Z","isFirstParty":false}