Circle Internet Financial Ltd.’s $USDC stablecoin may be the biggest beneficiary under new European guidelines governing digital assets that are set to take effect in July, according to crypto analytics firm Kaiko Research. $USDC is expected to take market share from bigger rival Tether Holdings Ltd.’s $USDT, Anastasia Melachrinos, a Paris-based analyst at Kaiko, said during a conference call Tuesday. Stablecoins are mostly used by traders to move digital assets between exchanges, or as a means of storing wealth away from token price volatility.