Circle gives legacy USDC apps 95 days before old cross-chain transfer routes stop working

Circle's CCTP V1 deprecation gives developers still using the first version of its Cross-Chain Transfer Protocol (CCTP) 95 days to migrate before the legacy contracts stop processing USDC transfers.

The company said CCTP V1 burn limits will begin falling on Oct. 31. A burn limit caps how much USDC can be destroyed on one chain for reminting on another. Circle plans to reduce those limits and transfer capacity through November, then pause the contracts on Dec. 1. Any integration still pointing to V1 at that point will no longer move USDC across chains.

The cutoff governs cross-chain routing. Circle's migration guide says users will retain access to funds during the phase-out and pending redemptions will remain available. An attestation is Circle's signed approval for USDC burned on a source chain to be minted on a destination chain. Circle said it will keep enough minting capacity available to complete outstanding attestations before V1 is fully paused.

CCTP V1 deprecation: code changes and exposed routes

The migration requires code changes. CCTP V2, now branded simply as CCTP, uses different contract addresses, interfaces and APIs and is incompatible with V1.

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