Not for casino transactions. However, Google Pay does charge a 1.5% or $0.31 fee (whichever is higher) if you withdraw money stored in Google Pay to another account. This shouldn't affect you, since most Google Pay casino withdrawals go directly to the card that was used to deposit them, rather than to your Google wallet. Top Google Pay online casinos usually avoid charging for deposits and withdrawals too — they know customers hate that. It's always worth reading the terms and conditions to be extra-sure, though.