U.S. spot Bitcoin and Ethereum ETFs picked up roughly $23 billion in total value last week. Only $2.6 billion of that came from new money. Everything else came from Bitcoin and Ethereum simply getting more expensive.
That distinction may get lost in the euphoria of a market rally. A crypto fund's total value—what's called assets under management, or AUM—grows for two separate reasons: fresh cash coming in the door, or the coins already sitting inside becoming worth more. Last week, almost all of the growth was the second kind.
Myriad: Bitcoin next price move? Click to make your prediction. 
The AUM side moved much further. Bitcoin ETF assets climbed 25.4% to $96.1 billion from $76.6 billion. Ethereum ETF assets jumped 35.9% to $14.3 billion from $10.5 billion.
Add those together and total assets rose about $23.3 billion for the week. Strip out the $2.6 billion investors actually put in, and roughly $20.7 billion of that increase was pure price appreciation—Bitcoin and Ethereum becoming worth more while sitting exactly where they already were.
Why the coins got more valuableThree separate forces pushed prices that hard. The clearest was the U.S. Treasury's move to double its long-bond buyback program—purchases of the government's own debt meant to support demand and lower borrowing costs—which weakened the dollar and pushed investors toward assets often used as inflation hedges, Bitcoin included.
Myriad: Ethereum next price move? Click to make your prediction. BlackRock's IBIT captured the largest share of the new money, at one point taking in 83 cents of every dollar that flowed into Bitcoin funds in a single day. XRP funds also drew fresh demand, pulling in $39.78 million and setting a record weekly volume of $271.74 million.
The rally hasn't erased 2026's damage. Bitcoin ETFs are still down in net outflows for the year, and Ethereum ETFs remain negative, narrowing the combined year-to-date deficit from $5.7 billion to $3.1 billion.
