Transfer Volume

Daily on-chain BTC transfer volume derived from UTXO spending activity

Property	Value
Category	Coin Days
Unit	BTC
Resolution	1d
Assets	BTC
Tier	Pro
API Endpoint	GET /v1/coindays
Field	transfer_volume

Overview

Transfer Volume measures the total amount of Bitcoin (in BTC) that was spent on-chain each day. It is computed directly from the UTXO set by summing the absolute value of all negative deltas in the daily UTXO cohort data — every time a UTXO is consumed in a transaction, its full amount counts toward that day's transfer volume.

Unlike exchange-reported trading volume (which includes wash trading, leverage, and internal transfers), Transfer Volume is a pure on-chain metric derived from actual Bitcoin transactions recorded on the blockchain. It represents real economic activity — coins physically changing hands.

Transfer Volume is a key building block for Dormancy (average age of spent coins) and serves as an independent measure of on-chain economic throughput.

Formula

$$\text{Transfer Volume}_t = \sum_{i \in \text{spent UTXOs on day } t} |\Delta_i|$$

Where:

• $|\Delta_i|$ is the BTC amount of the spent UTXO
• The sum includes all UTXOs whose amount decreased (spent) on day $t$

Interpretation

• High Transfer Volume indicates heavy on-chain activity — large amounts of BTC changing hands. Often spikes during price rallies, panic sells, and whale redistribution events
• Low Transfer Volume suggests on-chain quietness — holders are not moving coins. Typical of late-stage bear market accumulation when only patient holders remain
• Transfer Volume vs Exchange Volume: On-chain volume is a subset of total economic activity but is more trustworthy as it cannot be faked
• Trend analysis: Rising transfer volume with rising price = healthy bull market with real capital flows. Rising volume with falling price = capitulation or forced selling

Use Cases

• On-chain activity measurement: The most direct measure of how much Bitcoin is actually moving on the blockchain each day
• Dormancy denominator: Transfer Volume is required to compute Dormancy (CDD / Transfer Volume), which measures the average age of spent coins
• Market health assessment: Compare on-chain transfer volume trends with price trends to assess whether price movements are supported by real economic activity
• Network value-to-transactions ratio (NVT): Transfer Volume in USD terms is the denominator for the NVT ratio, a widely-used on-chain valuation metric

API Usage

curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://api.blocklens.co/v1/coindays?start_date=2024-01-01&end_date=2024-12-31&limit=365"

Related Metrics

• Coin Days Destroyed — Sum of coin age × amount for all spent UTXOs per day — a fundamental measure of on-chain economic activity
• Dormancy — Average lifespan of spent coins in days — high dormancy means old coins are moving
• Dormancy Flow — Dormancy relative to its yearly average — above 1 means old coins moving more than usual