Circle stock drops 20% as USDC reward limits are debated; Tether hires Big Four auditor

Circle shares slid 20% on Tuesday as investors reacted to draft stablecoin legislation that could curb rewards tied to holding USDC. The move came alongside Tether's announcement that it has hired a Big Four accounting firm for its first full audit and claims that Circle froze USDC balances across 16 hot wallets.