Circle gives legacy USDC apps 95 days before old cross-chain transfer routes stop working
Circle’s CCTP V1 deprecation offers builders nonetheless utilizing the primary model of its Cross-Chain Switch Protocol (CCTP) 95 days emigrate earlier than the legacy contracts cease processing $USDC transfers.
The corporate stated CCTP V1 burn limits will start falling on Oct. 31. A burn restrict caps how a lot $USDC could be destroyed on one chain for reminting on one other. Circle plans to cut back these limits and switch capability via November, then pause the contracts on Dec. 1. Any integration nonetheless pointing to V1 at that time will not transfer $USDC throughout chains.
The cutoff governs cross-chain routing. Circle’s migration information says customers will retain entry to funds in the course of the phase-out and pending redemptions will stay obtainable. An attestation is Circle’s signed approval for $USDC burned on a supply chain to be minted on a vacation spot chain. Circle stated it should preserve sufficient minting capability obtainable to finish excellent attestations earlier than V1 is absolutely paused.
CCTP V1 deprecation: code adjustments and uncovered routes
The migration requires code adjustments. CCTP V2, now branded merely as CCTP, makes use of completely different contract addresses, interfaces and APIs and is incompatible with V1.
Integrators should level to the V2 variations of TokenMessenger, MessageTransmitter and TokenMinter, replace their contract interfaces, and alter calls to depositForBurn. The V2 perform provides parameters for the permitted vacation spot caller, most price and minimal finality threshold. Builders should additionally exchange legacy attestation calls with the /v2/messages/{sourceDomainId} circulate, select normal or quick settlement the place obtainable, and deal with relevant charges.
Groups that want uninterrupted service face an earlier operational deadline than Dec. 1. The Oct. 31 burn-limit cuts start a November wind-down during which V1 capability will progressively shrink.
Circle’s present supported-chain matrix lists 27 blockchains on the present CCTP community. Aptos is listed among the many chains supported solely by CCTP V1, alongside Noble and Sui, on Circle’s legacy community.
Aptos, Noble and Sui are the one chains Circle presently labels as V1-only. A local CCTP path to or from any of them nonetheless is dependent upon the legacy community except an integrator makes use of a individually documented various. Circle didn’t determine which exchanges, wallets, bridges or apps proceed to name the outdated contracts, leaving the variety of named manufacturing integrations dealing with the cutoff undisclosed.
Circle’s adoption figures provide historic scale reasonably than a measure of present publicity. In a November 2025 replace, the corporate stated CCTP had processed greater than $110 billion throughout 5.3 million transfers. These cumulative totals mixed V1 and V2 as of Nov. 14, 2025.
Crypto’s earlier Noble protection described the broader V1 phase-out. Circle’s CCTP V1 deprecation dates now set the integration-wide timetable: capability begins falling Oct. 31, and V1 contracts pause Dec. 1.
