Your app balance consists of two components: earned

app fees

and deposited funds for

fee sponsorship

. App fees are additional fees you can set on top of Relay fees (measured in basis points) that accrue off-chain in USDC to minimize gas costs. Deposit funds to your app balance to sponsor destination chain fees for your users, improving UX and reducing friction during onboarding. Major currencies (ETH, USDC, USDT) are withdrawn on Base, while others are withdrawn on their origin chain.