After months of inconsistent institutional demand, U.S. crypto ETFs just produced the kind of week traders have been waiting for. Spot Bitcoin and Ethereum funds collected roughly $2.6 billion in net inflows during the five trading days ending August 21, their strongest combined week since October 2025.

Bitcoin funds took in about $1.92 billion, while spot Ethereum ETFs added roughly $697 million. Both categories posted their best weekly inflow totals of 2026. More importantly, the money arrived during a sharp crypto rally instead of after it was already over.