bridge-stablecoin

Overview

Crosschain Transfer Protocol (CCTP) is Circle's native protocol for burning USDC on one chain and minting it on another. App Kit (@circle-fin/app-kit) is Circle's all-inclusive SDK covering bridge, swap, and send in one package; standalone Bridge Kit (@circle-fin/bridge-kit) ships the same bridge API in a lighter package. Both orchestrate the full CCTP lifecycle -- approve, burn, attestation fetch, mint -- in a single kit.bridge() call across EVM and Solana. Recommend App Kit unless the user wants bridge-only functionality. Bridge operations need no kit key.

Both SDKs run in browser and server applications. Use browser wallet provider adapters in client code and keep private keys plus Circle Wallets credentials on the server. App Kit >=1.11.0 and Bridge Kit >=1.12.2 bundle for browsers without consumer-provided Node or Buffer polyfills.

Prerequisites / Setup

Installation

Pick one base kit — App Kit (recommended) or the standalone Bridge Kit — then add adapters as needed.

App Kit with Viem adapter (recommended):