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  • Prerequisites
  • Option A: Direct deposit via Inbox programmatically
  • Option B: Direct deposit via inbox on Etherscan
Guides

Bridge CGT (Arbitrum)

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This guide walks you through depositing the CGT token from Ethereum (L1) to your Arbitrum rollup (L2).

Prerequisites

  • L1 RPC URL (for example, Ethereum Sepolia)
  • Private key with enough ETH for gas on L1
  • TOKEN_ADDRESS: CGT token address on L1
  • INBOX_ADDRESS: Find this on the rollup contracts page as the “Inbox” or fetch it from api.conduit.xyz/file/v1/arbitrum/core/your-network-slug

Only CGT rollups exposes ERC20 deposit functions directly on the Inbox.

Option A: Direct deposit via Inbox programmatically

Deposit CGT by calling your rollup’s Inbox contract directly from the command line.

1

Approve tokens to the Inbox

Approve the INBOX_ADDRESS as a spender for the amount you plan to deposit.

$cast send "$TOKEN_ADDRESS" "approve(address,uint256)" "$INBOX_ADDRESS" "$RAW_AMOUNT" \
>  --private-key "$PRIVATE_KEY" --rpc-url "$L1_RPC_URL"
2

Call the Inbox deposit function

Call the deposit function exposed by your rollup’s Inbox implementation. The signature may vary; a common pattern is depositERC20(address,uint256).

$cast send "$INBOX_ADDRESS" "depositERC20(address,uint256)" "$TOKEN_ADDRESS" "$RAW_AMOUNT" \
>  --private-key "$PRIVATE_KEY" --rpc-url "$L1_RPC_URL"

Option B: Direct deposit via inbox on Etherscan

Use Etherscan to approve and deposit without writing code.

1

Approve CGT to the Inbox

  1. Open your CGT token on Etherscan (L1), go to Contract → Write Contract.
  2. Connect your wallet with Connect to Web3.
  3. Find approve and set spender to your INBOX_ADDRESS, amount to the desired deposit amount (in wei).

Approve CGT on Etherscan

2

Deposit on the Inbox contract

  1. Open the INBOX_ADDRESS on Etherscan, go to Contract → Write Contract.
  2. Connect your wallet.
  3. Call the Inbox deposit function. For many rollups, this is depositERC20(address,uint256) with parameters:
  • token: TOKEN_ADDRESS (CGT on L1)
  • amount: amount in wei

Deposit via Inbox on Etherscan

3

Wait for L2 credit

After the L1 transaction confirms, the rollup sequencer picks up the message and credits your L2 balance once the retryable ticket executes.