Bridging

Step-by-step guide for moving assets between Base, Ethereum, and Canton Network.

There are two bridges available today:

• Asset Relayer — bridges SEND, USDC, cbBTC, and frxUSD between Base ↔ Canton. Wrapped tokens on Canton are suffixed .B (e.g. USDC.B).
• USDCx Ethereum Bridge — bridges USDC from Ethereum → Canton as USDCx.

Base ↔ Canton (via Asset Relayer)

Move SEND, USDC, cbBTC, or frxUSD between Base and Canton.

What you need

• A Send App account with the asset you want to bridge (create one)
• USDC in your Send App to cover the network fee (e.g. ~0.02 USDC)
• Your Send App connected to your Canton Wallet (create one)
• A Bridge User Agreement for the asset (one-time setup — Part 1 below)

Part 1: Create the Bridge Agreement (one-time per asset)

The first time you bridge a given asset, you must create a Bridge User Agreement. This is a one-time setup per asset that enables deposits and withdrawals.

Step 1: Open your Canton Wallet and tap the menu icon (☰) in the top left.

Step 2: Tap Bridge.

Step 3: On the Bridge page, tap the asset dropdown. Each asset shows its status:

• Authorized — ready to bridge
• Not enabled — requires setup

Step 4: Select the asset (e.g. SEND).

Step 5: If the asset is not yet authorized, tap Enable [asset] for bridging, then Create Bridge Agreement.

Step 6: Wait for approval. The page will show "Awaiting Agreement Approval" — the bridge operator approves it within a few minutes. Tap Check Status to refresh.

Part 2: Bridge the asset

Step 1: Open your Send App and tap your profile picture in the top left.

Step 2: Tap Settings.

Step 3: Under Features, tap Connections.

Step 4: Tap Bridge to Canton.

Step 5: Enter the amount you want to bridge. Tap MAX to bridge your full balance. The destination is your Canton Wallet address.

Step 6: Tap Review and verify:

• You bridge — amount being sent
• You receive — amount arriving on Canton
• Network fee — paid in USDC
• Destination — your Canton Wallet address

Step 7: Tap CONFIRM. Authenticate with your passkey when prompted.

Step 8: You'll see a "Deposit submitted" status. Your bridged asset typically arrives in your Canton Wallet within seconds.

Ethereum → Canton (USDCx)

Bridges USDC from Ethereum mainnet to Canton Network as USDCx. This is the original Canton USDC representation, used by Canton-native venues and integrations that predate Asset Relayer.

What you need

• A Canton Wallet (create one)
• USDC on Ethereum mainnet
• ETH on Ethereum mainnet for gas

TODO — Click-by-click flow for the USDCx Ethereum bridge in the Canton Wallet. Mirror the structure above (one-time setup if applicable, then bridge steps).

After Bridging

Once your asset is on Canton, you can:

• Hold it in your Canton Wallet
• Transfer it to other Canton addresses
• Use it in Canton apps like Pool Party for swaps and liquidity

FAQs

What is bridging? Bridging transfers your tokens from one blockchain network to another while preserving the same value. The original asset is locked on the source chain and a wrapped version is issued on the destination chain.

Do I need to set up the Bridge Agreement every time? No. The Bridge User Agreement is a one-time setup per asset. Once approved, you can bridge that asset any time.

What fees are involved? A small network fee paid in USDC on Base (e.g. ~0.02 USDC). Make sure you have USDC in your Send App before bridging.

How long does bridging take? Bridged assets typically arrive in your Canton Wallet within seconds after the transaction confirms.

Why do I need USDC for bridging? USDC is used to pay the network transaction fee on Base.

Which tokens can I bridge? At launch via Asset Relayer: SEND, USDC, cbBTC, and frxUSD. Check the Bridge page in your Canton Wallet for the current list of authorized assets.

What if my Bridge Agreement is not approved? Approval typically takes a few minutes. If it takes longer, tap Check Status to refresh, or contact support.

What's the difference between USDCx and USDC.B? USDCx is USDC bridged from Ethereum (legacy Canton representation). USDC.B is USDC bridged from Base via Asset Relayer. They are different tokens and not directly interchangeable.

Security

• Reserve contracts on Base are built on Circle's xReserve framework.
• Canton-side authorization uses Send Safe multisig — majority quorum of three or more independent signers from Canton Foundation or supervalidators.
• Bridging carries smart contract, multisig, network, and liquidity risk. See the Asset Relayer overview for the full security model.