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

Timeline of the CCTP V1 wind-down from Aug. 28 through the Oct. 31 burn-limit cuts and Dec. 1 contract pause, with Aptos, Noble and Sui marked as V1-only routes.

Circle’s CCTP V1 deprecation gives builders nonetheless utilizing the primary model of its Cross-Chain Transfer Protocol (CCTP) 95 days emigrate before the legacy contracts stop processing USDC transfers.

The firm stated CCTP V1 burn limits will begin falling on Oct. 31. A burn restrict caps how a lot USDC may be destroyed on one chain for reminting on one other. Circle plans to cut back these limits and transfer capability by means of 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 guide 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 can preserve sufficient minting capability obtainable to finish excellent attestations before V1 is absolutely paused.

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CCTP V1 deprecation: code modifications and uncovered routes

The migration requires code modifications. CCTP V2, now branded merely as CCTP, makes use of totally 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 operate provides parameters for the permitted vacation spot caller, most price and minimal finality threshold. Developers should additionally substitute legacy attestation calls with the /v2/messages/{sourceDomainId} movement, select commonplace or quick settlement the place obtainable, and deal with relevant charges.

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Teams that want uninterrupted service face an earlier operational deadline than Dec. 1. The Oct. 31 burn-limit cuts start a November wind-down through which V1 capability will progressively shrink.

Timeline of the CCTP V1 wind-down from Aug. 28 through the Oct. 31 burn-limit cuts and Dec. 1 contract pause, with Aptos, Noble and Sui marked as V1-only routes.

Circle’s current 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 network.

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 relies on the legacy community except an integrator makes use of a individually documented various. Circle didn’t establish which exchanges, wallets, bridges or apps proceed to name the old contracts, leaving the variety of named manufacturing integrations going through the cutoff undisclosed.

Circle’s adoption figures supply historic scale reasonably than a measure of present publicity. In a November 2025 update, the corporate stated CCTP had processed greater than $110 billion throughout 5.3 million transfers. Those cumulative totals mixed V1 and V2 as of Nov. 14, 2025.

CryptoSlate’s earlier Noble coverage 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.

The submit Circle gives legacy USDC apps 95 days before old cross-chain transfer routes stop working appeared first on CryptoSlate.

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