pub const USDC_MAINNET_MINT: Pubkey;
SPL USDC mint. Devnet: GAmHPNMcgh9BTpe3DWirqMwvYCeDskE2im6fUhZyukJp (custom devnet USDC) Mainnet: EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v (Circle mainnet)