Daily net flows into US spot Bitcoin and Ether ETFs — the clearest read on institutional demand. Green days are net inflows (funds buying coins); red days are net outflows.
Bars above the line = net inflow, below = net outflow. Hover a bar for the value.
A US spot ETF has to buy or sell the underlying coin to match shares created or redeemed. So when an ETF sees net inflows, the issuer is buying real spot Bitcoin or Ether to back the new shares — adding genuine demand. Net outflows mean the opposite: coins are sold back into the market.
Because of that mechanical link, sustained flow trends are one of the most-watched demand proxies in crypto. A run of strong green days signals institutions accumulating; a run of red days signals distribution. Single days are noisy — the cumulative trend is the signal.
Daily flows are available per asset (BTC, ETH, SOL, XRP):
curl -H "X-API-Key: cdk_live_yourkey" \ https://cryptodataapi.com/api/v1/market-intelligence/etf/btc/flows
Swap btc for eth, sol or xrp. See the ETF flows endpoint docs.