> ## Documentation Index
> Fetch the complete documentation index at: https://base-a060aa97-eb-mini-app-ia-overhaul.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Bridging an L1 token to Base

> How to submit ERC-20 tokens for bridging between Ethereum and Base as a token issuer.

This page is intended for token issuers who already have an ERC-20 contract deployed on Ethereum and would like to submit their token for bridging between Ethereum and Base. Base uses the [Superchain token list](https://github.com/ethereum-optimism/ethereum-optimism.github.io) as a reference for tokens that have been deployed on Base.

***Disclaimer: Base does not endorse any of the tokens that are listed in the Github repository and has conducted only preliminary checks, which include automated checks listed*** [***here***](https://github.com/ethereum-optimism/ethereum-optimism.github.io)***.***

## Adding your token to the list

The steps below explain how to get your token on the Base Token List.

### Step 1: Deploy your token on Base

Select your preferred bridging framework and use it to deploy an ERC-20 for your token on Base. We recommend you use the framework provided by Base's [standard bridge](https://github.com/ethereum-optimism/specs/blob/main/specs/protocol/bridges.md) contracts, and furthermore deploy your token using the [OptimismMintableERC20Factory](https://docs.optimism.io/app-developers/tutorials/bridging/standard-bridge-standard-token). You can find the list of contracts addresses [here](/base-chain/network-information/base-contracts).

Deploying your token on Base in this manner provides us with guarantees that will smooth the approval process. If you choose a different bridging framework, its interface must be compatible with that of the standard bridge, otherwise it may be difficult for us to support.

### Step 2: Submit details for your token

Follow the instructions in the [Github repository](https://github.com/ethereum-optimism/ethereum-optimism.github.io) and submit a PR containing the required details for your token. You must specify in your token's data.json file a section for ‘base-sepolia' and/or ‘base’. The change you need to submit is particularly simple if your token has already been added to the Superchain token list. For example, [this PR](https://github.com/ethereum-optimism/ethereum-optimism.github.io/commit/27ab9b2d3388f7feba3a152e0a0748c73d732a68) shows the change required for cbETH, which was already on Optimism's token list and relies on the Base standard bridge.

### Step 3: Await final approval

Reviews are regularly conducted by the Base team and you should receive a reply within 24-72 hours (depending on if the PR is opened on a weekday, weekend or holiday).