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ETF Cumulative Flow (BTC)

Cumulative BTC net flow into ETFs

PropertyValue
CategoryETF Analytics
UnitBTC
Resolution1d
AssetsBTC
TierBasic
API EndpointGET /v1/etf/aggregate
Fieldcumulative_flow_btc

Overview​

ETF Cumulative Flow (BTC) is the running total of all daily net flows since the first day of ETF data. It shows the overall trajectory of ETF accumulation over time, smoothing out the day-to-day noise of individual flow readings. This metric answers the question: "How much net BTC have ETFs accumulated since they launched?"

While daily net flow captures the immediate buying/selling dynamic, cumulative flow reveals the longer-term trend. A consistently rising cumulative flow chart indicates sustained institutional demand, even if individual days show occasional outflows.

Formula​

Cumulative Flowt=∑d=1tNet Flowd\text{Cumulative Flow}_{t} = \sum_{d=1}^{t} \text{Net Flow}_{d}

This is equivalent to Total Holdingst−Total Holdings0\text{Total Holdings}_{t} - \text{Total Holdings}_{0}, but computed incrementally.

Interpretation​

  • Steadily rising cumulative flow indicates sustained net buying pressure from ETF investors — the strongest bullish structural signal.
  • Flattening cumulative flow means inflows and outflows are roughly balanced — neutral positioning.
  • Declining cumulative flow indicates sustained net redemptions — institutional investors are reducing Bitcoin exposure.
  • Rate of change matters: acceleration in cumulative flow (convex curve) signals growing demand momentum; deceleration (concave curve) signals fading interest.
  • Compare the cumulative flow number with total circulating supply to understand the cumulative demand impact.

Use Cases​

  • Long-term trend analysis: Cumulative flow is the best metric for understanding the overall direction and pace of institutional ETF adoption.
  • Narrative support: A rising cumulative flow chart is a powerful visual for demonstrating institutional Bitcoin demand.
  • Cycle positioning: Compare cumulative flow patterns across different market phases to understand how institutions behave in bull vs. bear markets.
  • Demand momentum: The slope of cumulative flow indicates whether institutional demand is accelerating, steady, or decelerating.

API Usage​

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