USDC is now linked between HyperCore and HyperEVM. This is a major milestone in allowing secure, natively minted cross chain USDC deposits directly to HyperCore. In the final state, the Arbitrum bridge will be deprecated and all USDC will be natively minted. There are many details still to build out, and the priority is to roll out features in a safe way while giving users and builders ample time to migrate. Thank you to the Circle team’s hard work on building this integration.

For users and builders, there is no immediate breaking change. Users can deposit and withdraw from both the Arbitrum bridge and HyperEVM. HyperCore now supports one-click deposits from CCTP-enabled chains, abstracting away the minting on HyperEVM. The CCTP route from Arbitrum has been deployed by Circle, with others to follow.

During this transition phase, USDC transfers from HyperCore to HyperEVM (including HyperEVM and CCTP USDC “withdrawal” options) may fail if there is insufficient balance on HyperEVM. If a transfer/withdrawal to HyperEVM fails, the funds are still safe and remain in HyperCore. Users can still withdraw from the Arbitrum bridge instead. If users want USDC on HyperEVM, they can send to HyperEVM from Arbitrum via CCTP, the same as before the linking. This is an intentional design during the transition period, as the Arbitrum bridge and HyperEVM are separate even though the USDC is fungible on HyperCore.

Builders can begin switching their integrations to use HyperEVM USDC deposit flow. The USDC contracts support CCTP transfers from other chains to and from HyperCore with a single source chain transaction, which is a meaningful improvement in user experience. See https://github.com/circlefin/hyperevm-circle-contracts for details.