bridge-stablecoinlisted

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.
Ekinoxis-evm/claude-skills · ★ 0 · AI & Automation · score 60

Install: claude install-skill Ekinoxis-evm/claude-skills

## 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): ```bash npm install @circle-fin/app-kit @circle-fin/adapter-viem-v2 ``` Bridge Kit standalone with Viem adapter: ```bash npm install @circle-fin/bridge-kit @circle-fin/adapter-viem-v2 ``` For Solana support, also install: ```bash npm install @circle-fin/adapter-solana-kit ``` For Circle Wallets (developer-controlled) support: ```bash npm install @circle-fin/adapter-circle-wallets ``` ### Environment Variables ``` PRIVATE_KEY= # EVM wallet private key (hex, 0x-prefixed) EVM_PRIVATE_KEY= # EVM private key (when also using Solana) SOLANA_PRIVATE_KEY= # Solana wallet private key (base58) CIRCLE_API_KEY= # Circle API key (for Circle Wallets adapter) CIRCLE_ENTITY_SECRET= # Entity secret (for Circle Wallets adapter) EVM_WALLET_ADDRESS=