> ## Documentation Index
> Fetch the complete documentation index at: https://docs.initia.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# ERC20Registry

GitHub:
[ERC20Registry](https://github.com/initia-labs/initia-evm-contracts/blob/main/src/ERC20Registry.sol)

## Overview

The `ERC20Registry` contract provides modifiers for registering ERC20 tokens and
their associated stores. Registration allows the token to be recognized and made
interoperable with other parts of the MiniEVM rollup functionality.

## Modifiers

### `register_erc20`

Registers an ERC20 token with the ERC20 registry. This is done to allow the
token to be recognized and interoperable with other parts of the MiniEVM rollup.

```solidity theme={null}
modifier register_erc20() {
    ERC20_REGISTRY_CONTRACT.register_erc20();
    _;
}
```

### `register_erc20_store`

Registers an ERC20 store for a given account with the ERC20 registry if it is
not already registered. This is done to keep track of which accounts are
associated with which ERC20 tokens.

```solidity theme={null}
modifier register_erc20_store(address account) {
    if (!ERC20_REGISTRY_CONTRACT.is_erc20_store_registered(account)) {
        ERC20_REGISTRY_CONTRACT.register_erc20_store(account);
    }
    _;
}
```

#### Parameters

| Name      | Type      | Description                                                                     |
| --------- | --------- | ------------------------------------------------------------------------------- |
| `account` | `address` | The address of the ERC20 store to check and register if not already registered. |