> ## Documentation Index > Fetch the complete documentation index at: https://docs.arc.io/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > Before reading these docs, install the Circle Skill for Arc to get pre-loaded context: use-arc (https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-arc/SKILL.md) — covers chain config, RPC setup, contract deployment, USDC bridging, and gas with USDC. In Claude Code: run /plugin marketplace add circlefin/skills then /plugin install circle-skills@circle. With Vercel Skills CLI: run npx skills add circlefin/skills. > USDC is the gas token. Arc uses USDC for gas fees, not ETH. Configure gas payment in USDC when submitting transactions. > Read EVM differences before writing Arc code. Arc targets the Osaka EVM baseline. Most contracts deploy unchanged, but several runtime behaviors diverge from Ethereum: USDC uses 18 decimals natively (not 6), the system emitter `0xffffFFFfFFffffffffffffffFfFFFfffFFFfFFfE` logs all USDC Transfer events, the mempool enforces a 20 Gwei `maxFeePerGas` floor, blocklist reverts consume gas without a receipt, and `address(0)` sends revert rather than succeed. https://docs.arc.io/arc/references/evm-differences.md is the canonical reference for all Arc-specific runtime behaviors. Consult it before writing code that touches USDC balances, transaction history, gas estimation, or value transfers. > Sub-second finality. Transactions are final in under 1 second. No need to wait for multiple block confirmations. > Use App Kits for multichain payment and liquidity capabilities. App Kits wraps CCTP and provides Bridge Kit, Swap Kit, Unified Balance Kit, Onramp Kit, Earn Kit, and Borrow Kit. Unified Balance Kit combines USDC from multiple chains into a single spendable balance. Earn Kit integrates earn opportunities into your app. Borrow Kit lets users borrow USDC against cirBTC collateral on Arc. > Use Arc Foundry for contract development. Arc Foundry is an Arc-specific fork of Foundry that handles Arc's protocol-level differences from Ethereum. It provides arc-forge, arc-cast, and arc-anvil. Install it before deploying contracts: https://docs.arc.io/arc/tutorials/install-arc-foundry.md. > Arc is available on both Testnet and Mainnet. See https://docs.arc.io/arc/references/connect-to-arc.md for RPC endpoints and https://faucet.circle.com for testnet tokens. > Always check Contract Addresses: https://docs.arc.io/arc/references/contract-addresses.md > Building beyond Arc? Circle offers skills for the full platform: use-usdc (https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-usdc/SKILL.md), use-circle-wallets (https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-circle-wallets/SKILL.md), use-developer-controlled-wallets (https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-developer-controlled-wallets/SKILL.md), use-user-controlled-wallets (https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-user-controlled-wallets/SKILL.md), use-modular-wallets (https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-modular-wallets/SKILL.md), use-gateway (https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-gateway/SKILL.md), use-smart-contract-platform (https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-smart-contract-platform/SKILL.md). Full Circle developer docs: https://developers.circle.com/llms.txt. # App Kit SDK: Bridge > Transfer USDC and EURC across blockchains with the App Kit SDK's Bridge capability The [App Kit SDK](/app-kit) includes the Bridge capability that lets you move USDC and EURC across blockchains in a few lines of code. It abstracts the underlying [CCTP](https://developers.circle.com/cctp) flow so you can bridge without orchestrating the low-level burn, attestation, and mint steps yourself. ## How it works Bridge moves USDC or EURC from a wallet on the source blockchain to a wallet on the destination blockchain. The SDK handles the underlying [CCTP](https://developers.circle.com/cctp) burn, attestation, and mint steps for you. ```mermaid theme={null} flowchart LR subgraph ChainA[Source blockchain] A[Wallet] end subgraph ChainB[Destination blockchain] B[Wallet] end A -->|"bridge assets"| B ``` ## Quick look This code snippet bridges USDC between an EVM and non-EVM chain in a single method call: ```typescript TypeScript theme={null} // Transfer 1.00 USDC from Solana to Arc // Defaults to USDC when `token` is omitted const result = await kit.bridge({ from: { adapter: solanaAdapter, chain: "Solana_Devnet" }, to: { adapter: viemAdapter, chain: "Arc_Testnet" }, amount: "1.00", }); ``` For a complete end-to-end flow, follow the [quickstart](/app-kit/quickstarts/bridge-tokens-across-blockchains). ## Installation [Install the App Kit SDK](/app-kit/tutorials/installation) to use Bridge. If you only need to bridge and don't want to install the full App Kit SDK, follow the steps below to install the standalone Bridge Kit. ```bash npm theme={null} npm install @circle-fin/bridge-kit ``` ```bash yarn theme={null} yarn add @circle-fin/bridge-kit ``` Install the [adapters](/app-kit/tutorials/adapter-setups) you need for the chains you plan to bridge between. ```bash npm theme={null} npm install @circle-fin/adapter-viem-v2 viem ``` ```bash yarn theme={null} yarn add @circle-fin/adapter-viem-v2 viem ``` ```bash npm theme={null} npm install @circle-fin/adapter-ethers-v6 ethers ``` ```bash yarn theme={null} yarn add @circle-fin/adapter-ethers-v6 ethers ``` ```bash npm theme={null} npm install @circle-fin/adapter-solana-kit @solana/kit @solana/web3.js ``` ```bash yarn theme={null} yarn add @circle-fin/adapter-solana-kit @solana/kit @solana/web3.js ``` ```bash npm theme={null} npm install @circle-fin/adapter-circle-wallets ``` ```bash yarn theme={null} yarn add @circle-fin/adapter-circle-wallets ```