Circle will begin reducing transfer capacity for applications that still use the legacy version of its Cross-Chain Transfer Protocol on October 31, ahead of a planned shutdown of the old contracts on December 1, 2026.
The change affects CCTP V1, the system applications use to move Circle’s USDC stablecoin between blockchains. According to CryptoSlate, Circle’s schedule calls for burn limits to be lowered from October 31, followed by a gradual reduction in transfer performance during November. Once the legacy contracts are paused, applications that have not migrated will no longer be able to transfer USDC through CCTP V1.
Legacy transfer routes face a staged wind-down
CCTP works by burning USDC on one blockchain and minting an equivalent amount on another. The burn limit controls how much USDC can enter that process over a given period. Circle also uses attestations, or signed approvals, to authorize the minting of the corresponding USDC on the destination chain.
The phase-out is designed to reduce new activity progressively rather than end it immediately. Circle’s migration guide describes tighter message limits leading to a point at which no new burns can be initiated. Transfer volume is expected to reach zero before the contracts are fully paused on December 1.
That timetable means the transition could affect applications’ ability to route new transfers throughout November, not only on the final shutdown date. Circle first announced its move away from CCTP V1 on November 14, 2025, and published the detailed October-to-December schedule on August 27, 2026.
Circle has distinguished between new transfers and transactions already in progress. Pending redemptions are expected to remain available during the wind-down. The company says it will keep minting allowances above the total amount represented by pending attestations, allowing those outstanding redemptions to be processed before the full pause.
In practical terms, the plan is intended to stop new burns gradually while preserving capacity for USDC that has already completed the relevant steps on the source chain.
Applications must update contracts and APIs for CCTP V2
Applications still connected to CCTP V1 will need to migrate their integrations. Circle says CCTP V2 is incompatible with legacy V1 implementations, meaning developers must update both the contracts they call and the APIs used by their applications.
The migration guide identifies replacement interfaces and addresses, including TokenMessengerV2 and MessageTransmitterV2. The V2 version of the depositForBurn function also adds parameters covering the permitted caller on the destination chain, the maximum fee and the minimum finality threshold. Existing application calls therefore cannot simply continue unchanged.
The process for obtaining attestations is also different. Under the older approach, an integration extracts message data from an on-chain transaction and hashes it before requesting an attestation. With V2, an application can use the messages endpoint with a transaction hash to retrieve the message and its attestation.
CCTP V2 adds Standard and Fast Transfer modes, as well as programmable hooks that can trigger actions on the destination blockchain. Fast Transfer includes a variable fee determined by the source chain, so applications migrating to the newer system must also account for the selected mode and related costs.
Not every V1 function has a direct replacement. Circle’s guide lists replaceDepositForBurn as removed, with no equivalent in V2. Developers can alternatively use Circle’s Arc App Kits, which are presented as an optional way to simplify routine work involving contract addresses, interfaces and attestations.
Moneyiar market picture
Moneyiar data recorded at 22:38 on October 25, 2026, showed USDC at $0.9998375755, with a 24-hour change of 0% and a seven-day change of -0.01%.
Other assets in the Moneyiar data were mixed. Cap was priced at $0.1084662705, up 35.1% over 24 hours and 55.28% over seven days. Nexus stood at $0.0000006151, up 1.61% over 24 hours but down 13.97% over seven days. RedStone was at $0.1452603192, down 2.72% over 24 hours and up 6.36% over seven days, based on data recorded at 22:39 on October 25.
The CCTP change is an infrastructure deadline rather than a change to USDC’s stated function as a stablecoin. Its immediate significance is for applications, exchanges and other systems that rely on Circle’s cross-chain transfer contracts: they must complete the technical migration before the V1 limits tighten and the legacy contracts are paused.
