Bridge to Unichain

PrediX uses USDC on Unichain as collateral via our in-app widget, direct CEX withdrawals, and gas-free Paymaster solutions. If your USDC is on another chain, you need to bridge it over.

Supported Source Chains

Chain	Default bridge in app	Time	Estimated fee
Ethereum	Across, Stargate	5-15 minutes	$2-8
Base	Across, Superbridge	2-5 minutes	$0.5-2
Arbitrum	Across, Stargate	2-5 minutes	$0.5-2
Optimism	Across, Superbridge	2-5 minutes	$0.5-2
Polygon	LayerZero, Across	5-10 minutes	$1-3
CEX (Binance, Coinbase, OKX, etc.)	Withdraw directly to Unichain (if supported by your CEX) or withdraw to Ethereum/Arbitrum then bridge	Depends on CEX	CEX withdrawal fee

Note

Tip: Coinbase, Binance and some exchanges have added Unichain network support. Direct withdrawal saves you a bridge step.

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Gas Fees (native ETH)

To pay transaction fees on Unichain you need a small amount of ETH on Unichain:

Tip

Unichain gas is extremely cheap - typical trade tx costs ~$0.001–0.01. A one-time bridge of $5 worth of ETH lasts thousands of transactions for EOA users.

Wallet type	Gas mechanism
Passkey + Smart Account	Paymaster auto-pays in USDC. Sponsorship covers gas if eligible - no ETH needed.
Web3 Wallet (EOA)	You pay ETH directly. Bridge ETH using the same widget - select ETH instead of USDC.

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Bridge Widget (in-app)

PrediX UI has an integrated Bridge widget - no need to open Across/Stargate in a separate tab.

_{PrediX Bridge Widget}

How to Bridge USDC to Unichain

1. Step 1: Open the Deposit Menu

   • Navigate to the app header and click on Deposit.

2. Step 2: Choose the Bridge Option

   • From the available methods, select Bridge from another chain.

3. Step 3: Configure Your Transfer

   • Select your Source Chain (e.g., Ethereum, Arbitrum, Base).
   • Enter the USDC amount you wish to transfer.

4. Step 4: Review the Quote

   Check the generated quote for:

   • Fees: The cost of the bridge transaction.
   • Time Estimate: How long the transfer will take.
   • Final Amount: The exact USDC you will receive on Unichain.

5. Step 5: Approve the Token

   • Approve USDC on the source chain to allow the bridge to move your funds.

   Note

   Note: This is usually a one-time action per token. The system uses Permit2 if supported to streamline the process.

6. Step 6: Execute the Deposit

   • Click Deposit and sign the transaction in your wallet on the source chain.

7. Step 7: Monitor Status

   • The app will automatically switch your network to Unichain and poll for the transaction status.

8. Step 8: Completion

   • Once the process is complete, the USDC will arrive in your Unichain wallet. You are now ready to trade.

How to Withdraw Directly from a CEX to Unichain

Many major exchanges (such as Coinbase) now support native withdrawals to Unichain, allowing you to skip the manual bridging process and save on fees.

[insert video here]

1. Step 1: Start the Withdrawal

   • On your CEX account, navigate to your wallet/assets and select USDC.
   • Click on Withdraw.

2. Step 2: Select the Correct Network

   • When prompted to choose a Network, select Unichain.

   Caution

   Note: If Unichain is not yet listed on your specific CEX, you will need to withdraw to Ethereum or Arbitrum first, and then use the Bridge process to move it to Unichain.

3. Step 3: Enter Your Destination Address

   • Copy your Unichain wallet address from the PrediX UI.
   • Paste it into the recipient address field on the CEX.

4. Step 4: Verify Security

   • Enter the amount you wish to withdraw.
   • Confirm the transaction using your 2FA (Authenticator app) or Email verification.

5. Step 5: Wait for Delivery

   • Your funds will be processed by the CEX.
   • This typically takes 5–30 minutes depending on the exchange’s internal review and network congestion. Once confirmed, your USDC will appear in your PrediX wallet.

Danger

Important: Test with a small amount ($10) the first time. Wrong network = lost funds with no recovery.

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Reverse Bridge (Unichain → Another Chain)

Same UI, opposite direction:

1. Step 1: Open the Withdrawal Menu

   • Navigate to the app header and click on Withdraw.

2. Step 2: Select the Bridge Option

   • From the available methods, select Bridge to another chain.

3. Step 3: Configure Your Transfer

   • Choose your Destination Chain (e.g., Ethereum, Base, or Arbitrum).
   • Enter the Amount of USDC you want to bridge.

4. Step 4: Authorize the Transaction

   • Review the estimated fees and arrival time.
   • Sign the transaction in your wallet on the Unichain network.

5. Step 5: Processing and Completed

   • Monitor the progress bar within the app.
   • Wait for completion: The transfer typically takes 2–15 minutes before the funds appear on your destination chain.

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Slippage & Quote

Bridges involve slippage (USDC prices across chains have a small spread).

• Across, Stargate: typically 0.05-0.2% slippage.
• The app quote shows: amount out after deducting fees + slippage.
• If prices move significantly during the bridge, you may receive a refund to the source chain (Across/LayerZero handle this case).

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If the Bridge Gets Stuck

• Across, Stargate: usually auto-complete within 1-30 minutes. If nothing after 1 hour: check the source chain explorer (tx confirmed?), check the destination chain (UserOp/relay arrived?).
• Contact bridge support directly - PrediX does not operate bridges, only integrates the UI.