pub const USDC_MAINNET_MINT: Pubkey;
SPL USDC mint. Devnet: 4zMMC9srt5Ri5X14GAgXhaHii3GnPAEERYPJgZJDncDU (Circle faucet) Mainnet: EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v (Circle mainnet)