Circle starts winding down CCTP V1 ahead of the December 1 USDC bridge pause

Circle will start throttling the legacy Cross-Chain Transfer Protocol (CCTP V1) on Saturday, October 31. The wind-down will end Dec. 1, 2026, at which point V1 contracts stop. Apps still using USDC in the old system have about a month to change over to CCTP V2. Otherwise, their crosschain transfers will end. Burn limits drop from October 31 until a December 1 pause CCTP links USDC across blockchains. On one chain, it burns the stablecoin and mints that much on another chain. To clear the mint, Circle needs to sign off on it, which is called an attestation. There is a burn limit that tells the process how much USDC it can take in at any given time.

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