{"uid":"cap_ZqqqW7ygaytrYYzhkcyEZ","slug":"carbon-cashmere-btc-whale-activity-api-461ecef9","name":"Carbon & Cashmere BTC Whale Activity API","description":"Professional crypto market intelligence. Real-time prices, signals, and market scoring.","url":"https://api.carbon-cashmere.de/v1/btc/whale-activity","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"fees":{"avg_fee_rate_sat_vb":4.22},"_meta":{"source":"btc_zmq_whale_txs (local Bitcoin Core node)"},"activity":{"tx_count":5851,"largest_tx":{"ts":"2026-04-25T12:15:36+00:00","txid":"abc123...","output_btc":20215.24},"avg_size_vb":650,"tx_per_hour":243.79,"avg_output_btc":104.89,"avg_output_count":9,"median_output_btc":22.31,"total_output_btc_sum":613709.46},"trend_30d":{"_meta":"z-score on tx-count (activity proxy), NOT BTC-value-transferred","regime":"neutral_activity","z_score_30d":-0.272,"current_tx_per_hour":243.79,"baseline_tx_per_hour":261.66},"_disclaimer":"total_output_btc_sum includes change-outputs. NOT net value transferred. Activity indicator only.","window_hours":24,"min_output_btc_threshold":10}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Y7jend0i65uY4QiePJ_ca","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns 24-hour Bitcoin whale transaction activity metrics including transaction counts, output volumes, fee rates, and 30-day trend z-score regime classification.","exampleAgentPrompt":"What does Bitcoin whale activity look like right now — how many large transactions happened in the last 24 hours, what's the trend regime, and is the z-score showing anything unusual compared to the 30-day baseline?","exampleUseCases":[{"title":"Detect unusual whale movement today","prompt":"Are Bitcoin whales doing anything unusual right now? Pull the latest 24-hour transaction metrics and tell me if the z-score is flagging anything out of the ordinary compared to the 30-day baseline."},{"title":"Compare whale activity to historical baseline","prompt":"How does today's Bitcoin whale activity stack up against the 30-day baseline — are large wallets moving more or less than usual, and what regime are we in right now?"},{"title":"Check large BTC transaction fee rates","prompt":"What are whales paying in fees for large Bitcoin transactions right now, and how many of these big moves happened in the last 24 hours? I want to know if on-chain activity is heating up."}],"resultDescription":"Returns a JSON object with: 24-hour whale tx count, tx-per-hour rate, average and median BTC output sizes, total output BTC sum, largest single transaction (txid, timestamp, output BTC), average vbyte size, average fee rate in sat/vb, and a 30-day trend block containing z-score, regime label (e.g. 'neutral_activity'), current vs baseline tx-per-hour, plus metadata indicating the data source (local Bitcoin Core node).","failureModes":["Bitcoin Core node sync lag may cause stale data during network disruptions","Malformed or missing query parameters may return a 400 error","Payment not processed or invalid x402 header results in 402 Payment Required","Node connectivity issues may result in 503 Service Unavailable","The total_output_btc_sum includes change outputs and is NOT net value transferred — misinterpretation is a semantic failure mode"],"whenToPreferThis":"Choose this endpoint when you need real-time, node-sourced Bitcoin whale transaction activity with statistical trend context (z-score, regime classification) rather than just raw price data. Prefer over generic price APIs when the user wants on-chain large-wallet movement signals, activity regime detection, or fee rate intelligence directly from a Bitcoin Core node.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:56:43.016Z","isFirstParty":false}