If your mint did not complete (cap reached, finalized, or any failure), you can claim back the bridged USDC. Refund is paid out as USDC on Arc to the same address that bridged.
How this works. We poll Circle's Iris API for your bridge attestation. After the sale closes, refunds are permissionless. While minting is open, the original source wallet signs a free authorization tied to that exact message, so it can refund immediately without waiting 30 days.