Когда впервые появится USDC на футболке «Челси»?

The Circle and USDC branding debuts on Sunday at Chelsea's first home Premier League game of the season, against Brighton and Hove Albion at Stamford Bridge.

Есть ли у Circle разрешение регулятора Великобритании на эту сделку?

Yes. Circle holds an FCA electronic money issuer license in the UK, which matters because the regulator warned clubs in June about sponsorships with unauthorized crypto firms.