Bitcoin price falls. Why it’s a big week for cryptos.

Bitcoin is down 0.9% over the last 24 hours to $103,036, according to CoinDesk data. The world’s largest digital coin saw big movement over the weekend after credit-rating firm Moody’s downgraded U.S. debt from its AAA rating Friday.

Bitcoin spiked late Sunday to more than $106,500, but quickly gave back those gains. It isn’t immediately clear what prompted the surprise rise and subsequent fall—but the whole crypto industry is in for a potentially historic week.

The Senate looks set to pass a stablecoin bill as soon as Monday in what would be the first major legislative win for the industry.

The Genius Act would regulate coins pegged to a fiat currency such as Tether. Among other things, it would require issuers to hold reserves of liquid, safe haven assets as well as follow anti-money-laundering and terrorism finance rules.

Altcoins Ether, XRP and Solana fell between 3% and 5% early Monday, according to CoinDesk.