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ETF Daily Net Flow (BTC)

Daily BTC net flow into/out of ETFs

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

Overview​

ETF Daily Net Flow (BTC) measures the day-over-day change in total Bitcoin holdings across all tracked ETFs. This is the most closely watched ETF metric in the Bitcoin market because it directly represents the net buying or selling pressure from ETF investors on any given day. A positive net flow means ETFs collectively added more BTC than they redeemed; a negative net flow means the opposite.

Because spot Bitcoin ETFs operate on a creation/redemption mechanism, net flows have a direct impact on the underlying BTC market. When an ETF experiences net inflows, Authorized Participants must purchase actual BTC on exchanges to create new shares. Conversely, redemptions require selling BTC. This creates a direct link between ETF flow data and spot market dynamics.

Formula​

Net Flowt=Total BTC Holdingst−Total BTC Holdingst−1\text{Net Flow}_{t} = \text{Total BTC Holdings}_{t} - \text{Total BTC Holdings}_{t-1}

The first day of data has net_flow = 0 by convention (no prior day to diff against).

Interpretation​

  • Large positive flows (e.g., +5,000 BTC/day) represent significant buying pressure, often multiple times the daily mining issuance of ~450 BTC.
  • Large negative flows indicate institutional risk-off behavior and can exacerbate selling pressure during corrections.
  • Consecutive positive flow days ("flow streaks") are a strong bullish signal, indicating sustained institutional demand.
  • Flow magnitude relative to issuance is key: when daily ETF inflows exceed daily BTC issuance, it creates a structural supply deficit.
  • Flow reversals (positive to negative or vice versa) often coincide with short-term price turning points.

Use Cases​

  • Intraday/daily trading signals: Large flow days often front-run or confirm price moves.
  • Supply-demand modeling: Compare ETF net flows with mining issuance (~450 BTC/day) to assess supply/demand balance.
  • Institutional sentiment gauge: ETF flows are the most transparent window into institutional Bitcoin positioning.
  • Correlation analysis: Compare with exchange netflows and on-chain metrics to build a complete demand picture.

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"