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bridge-stablecoin

Skill

Build USDC bridging with Circle App Kit or standalone Bridge Kit SDK and Crosschain Transfer Protocol (CCTP). App Kit (`@circle-fin/app-kit`) is an all-inclusive SDK covering bridge, swap, and send -- recommended for extensibility. Bridge Kit (`@circle-fin/bridge-kit`) is a standalone package for br

0Developer Tools

Install

git clone https://github.com/circlefin/skills.git ~/.claude/skills/bridge-stablecoin

What is bridge-stablecoin?

Build USDC bridging with Circle App Kit or standalone Bridge Kit SDK and Crosschain Transfer Protocol (CCTP). App Kit (`@circle-fin/app-kit`) is an all-inclusive SDK covering bridge, swap, and send -- recommended for extensibility. Bridge Kit (`@circle-fin/bridge-kit`) is a standalone package for bridge-only use cases. Neither requires a kit key for bridge operations. Supports bridging USDC between EVM chains, between EVM chains and Solana, and between any two chains on Circle Wallets (i.e Developer-Controlled Wallets or Programmable wallets). Use when: bridge USDC, setting up Bridge Kit adapters (Viem, Ethers, Solana Kit, Circle Wallets), handling bridge events, collecting custom fees, configuring transfer speed, or using the Forwarding Service. Triggers on: bridge USDC, CCTP, move USDC between chains, @circle-fin/bridge-kit, @circle-fin/app-kit, forwarding service.

What this can do

Capabilities declared in this component's own frontmatter — not inferred.

Inherit all session tools

Declares no tool restrictions — inherits every session tool

~220 tokens of context used while enabled, before you invoke anything

Documentation

README · ~6 min read

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 (only swap/send in App Kit do).

Prerequisites / Setup

Installation

App Kit with Viem adapter (recommended):

npm install @circle-fin/app-kit @circle-fin/adapter-viem-v2

Bridge Kit standalone with Viem adapter:

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