CCTP V1: Circle Gives Legacy USDC Apps 95 Days to Migrate

Circle is giving developers 95 days to migrate off CCTP V1 before legacy cross-chain USDC routes stop working. Burn limits on the first version of the Cross-Chain Transfer Protocol begin falling Oct. 31, contracts pause Dec. 1, and any integration still pointing to old contract addresses will silently stop moving USDC between chains. The current CCTP network spans 27 blockchains, though Circle labels only three as V1-only: Aptos, Noble and Sui.

Why it matters

CCTP V2, now rebranded simply as "CCTP," is incompatible with V1 at the contract level. Integrators must repoint to new versions of TokenMessenger, MessageTransmitter and TokenMinter, swap their depositForBurn calls for a function that adds parameters for permitted destination caller, maximum fee and minimum finality threshold, and replace legacy attestation calls with a /v2/messages/{sourceDomainId} flow. That is not a config change. For teams that did not budget engineering time, this is a forced migration in a narrow window with hard deadlines rather than a soft deprecation warning.

The cutoff also reorders which chains are first-class USDC corridors. Aptos, Noble and Sui are the only blockchains Circle currently labels V1-only, which means a native CCTP route to or from any of them still depends on the legacy network unless an integrator patches in a separately documented alternative. Anyone whose USDC liquidity flows through those three chains is now on a 95-day clock.

Market impact

For USDC, this is bullish: Circle is consolidating the network around a single modernized contract stack rather than carrying V1 indefinitely, which simplifies cross-chain routing for the vast majority of integrations. The cumulative scale through Nov. 14, 2025 was more than $110 billion moved across 5.3 million transfers, and forcing the remaining holdouts onto V2 standardizes fees and settlement semantics across the live network.

The risk is concentrated. Circle did not disclose which exchanges, wallets, bridges or apps still call the old contracts, so the actual number of production integrations facing the cutoff is unknown. Capacity will progressively shrink through November before V1 pauses Dec.