ETF Inflow

The net dollar value of shares purchased into a spot exchange-traded fund over a period, reported daily by each issuer. For spot Bitcoin and Ethereum ETFs (BlackRock IBIT, Fidelity FBTC, etc.), inflows trigger creations — new shares minted against newly-purchased underlying crypto. Inflows of $100M-$1B per day became common in early 2024 after spot ETF approval. Inflow data is widely cited as a demand signal, but it does NOT equal new buying pressure on the broader market: substantial inflows are basis-trade hedged (long ETF + short futures), so a $500M inflow can be a market-neutral arbitrage rather than directional demand.