Bitcoin Mempool Analytics

Real-time Bitcoin mempool snapshot: recommended fees, pending whale transactions, recent blocks, hash rate, difficulty adjustment. Powered by mempool.space. No API key required.

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What It Does

Captures a full snapshot of the Bitcoin network state in one call:

• Recommended fees at 4 tiers (fastest / 30-min / 1h / economy / minimum) in sat/vB
• Mempool stats: pending tx count, total vsize, total fees, "blocks to clear" estimate
• Recent N blocks: height, hash, tx count, size, avg fee
• Hash rate (current EH/s) + difficulty adjustment (next % change, ETA)
• Whale transactions in mempool (configurable BTC threshold)

Optional Telegram alert when fees spike above your threshold.

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Why This Matters

• Fee timing — know exactly when to broadcast a tx (economy 1 sat/vB? fastest 50 sat/vB?)
• Whale activity — large pending BTC transfers (often > 100 BTC) are leading indicators of OTC flow / CEX deposits
• Difficulty adjustment — anticipated hash rate / mining economics changes
• Mining health — hash rate trend reveals miner capitulation or expansion

This Actor turns the firehose at mempool.space into a clean dataset for your trading bot, fee optimizer, or alert pipeline.

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Input

Field	Type	Default	Description
includeWhaleTransactions	boolean	true	Scan recent mempool for whale txs
minWhaleBtc	number	10	Min BTC for whale flag
blocksLookback	integer	10	Recent blocks to fetch stats for
alertFeeSatVb	integer	0	Alert when fastest fee ≥ this. 0 = disabled
telegramBotToken	string (secret)	—	Bot token for alerts
telegramChatId	string	—	Chat ID for alerts

Example: Cheap-fee window alert

{
  "includeWhaleTransactions": false,
  "alertFeeSatVb": 5,
  "telegramBotToken": "<token>",
  "telegramChatId": "<chat>"
}

Example: Whale-tx scan only

{
  "includeWhaleTransactions": true,
  "minWhaleBtc": 50,
  "blocksLookback": 1
}

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Output

Two record types:

Snapshot (_type: "mempool_snapshot"):

{
  "_type": "mempool_snapshot",
  "timestamp": "2026-06-03T01:35:00+00:00",
  "fastest_fee_sat_vb": 2,
  "half_hour_fee_sat_vb": 1,
  "hour_fee_sat_vb": 1,
  "economy_fee_sat_vb": 1,
  "minimum_fee_sat_vb": 1,
  "mempool_tx_count": 75069,
  "mempool_vsize_bytes": 28560123,
  "blocks_to_clear": 28.56,
  "latest_block_height": 952168,
  "latest_block_hash": "00000000000000000002a7f...",
  "current_hashrate_ehs": 720.45,
  "next_difficulty_change_pct": 1.85,
  "next_difficulty_eta_seconds": 432000
}

Whale TX (_type: "whale_tx"):

{
  "_type": "whale_tx",
  "txid": "f2c9...",
  "value_btc": 152.4,
  "fee_sat": 4500,
  "vsize_bytes": 250,
  "fee_rate_sat_vb": 18.0,
  "mempool_url": "https://mempool.space/tx/f2c9..."
}

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Pricing

• $0.002 per snapshot returned (includes whale txs in the same charge)

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Use Cases

Fee optimizer — Broadcast txs only when fastest ≤ 3 sat/vB:

curl -X POST "https://api.apify.com/v2/acts/gochujang~bitcoin-mempool-analytics/runs?token=YOUR_TOKEN" \
  -d '{"includeWhaleTransactions": false}'

Whale alert bot — Notify on every > 100 BTC pending tx + fee threshold.

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Data Source

mempool.space — the canonical public Bitcoin mempool explorer. Free, no auth, no rate limits at single-actor scale.

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Related Actors

• Smart Money Wallet Tracker — On-chain whale activity across EVM + Solana.
• Crypto ETF Flow Tracker — Institutional BTC ETF inflow/outflow.
• CEX Funding Rate Aggregator — Perp funding context across exchanges.

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🎬 Live Sample Run

A real run of this actor with default-ish inputs, executed on 2026-06-10:

Field	Value
Items in dataset	1
Dataset (JSON)	https://api.apify.com/v2/datasets/TjcJ4BcRMyj2fC0a7/items?clean=1&format=json
Dataset (CSV)	https://api.apify.com/v2/datasets/TjcJ4BcRMyj2fC0a7/items?clean=1&format=csv
Run summary (KVS)	https://api.apify.com/v2/key-value-stores/jIk21zNWpXKrCSjU7/records/SUMMARY
Run details	https://api.apify.com/v2/actor-runs/nZRcKf2UliosAcqiS

Try it now: pop any of the dataset URLs in your browser to see live output, or hit the API endpoints from your code.

Want to reproduce? Click Try Actor on the Apify Store page and use the input defaults shown above.

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