Bitcoin And Ethereum ETFs Add $492M As Inflow Streak Continues

US spot Bitcoin and Ethereum ETFs recorded a combined $492 million in net inflows for the August 21 session, extending a positive flow streak across both crypto ETF cohorts.

Farside Investors data showed spot Bitcoin ETFs adding $307 million, led by BlackRock’s IBIT with $239.3 million. Spot Ethereum ETFs brought in another $185 million, led by BlackRock’s ETHA with $151 million.

The August 21 session marked the fifth consecutive positive trading day for both groups, according to the flow data. Weekly inflows reached $1.92 billion for Bitcoin ETFs and $697 million for Ethereum ETFs.

That is a strong regulated-demand signal.

But the numbers should be read carefully: these are daily and weekly net-flow figures, not cumulative assets under management.

TL;DR

• Spot Bitcoin ETFs recorded $307 million in net inflows on August 21.
• Spot Ethereum ETFs added $185 million.
• Combined inflows reached $492 million, extending a five-day positive streak.

ETF Flows Keep Supporting The Rally

ETF demand has become one of the cleanest ways to track regulated crypto appetite.

When spot Bitcoin ETFs take in hundreds of millions of dollars in a session, it suggests traditional-market investors are adding exposure through familiar brokerage channels. When Ethereum ETFs also attract capital, the signal broadens beyond BTC alone.