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

# ERC20

> Auto-generated API documentation

[**@tevm/voltaire**](../../index.mdx)

***

[@tevm/voltaire](../../index.mdx) / [index](../index.mdx) / ERC20

# ERC20

Ethereum Token Standards (ERC Standards)

This module provides low-level interfaces for Ethereum token standards:

* ERC-20: Fungible tokens
* ERC-721: Non-fungible tokens (NFTs)
* ERC-1155: Multi-token standard
* ERC-165: Interface detection

Each standard exports:

* Function selectors (first 4 bytes of keccak256 of signature)
* Event signatures (keccak256 of event signature)
* Encoding helpers for calldata
* Decoding helpers for return values and events

## Variables

### EVENTS

> `const` **EVENTS**: `object`

Defined in: [src/standards/ERC20.ts:47](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/standards/ERC20.ts#L47)

ERC-20 event signatures
keccak256 hash of event signature

#### Type Declaration

##### Approval

> `readonly` **Approval**: `"0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925"` = `"0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925"`

Approval(address indexed owner, address indexed spender, uint256 value)

##### Transfer

> `readonly` **Transfer**: `"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"` = `"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"`

Transfer(address indexed from, address indexed to, uint256 value)

***

### SELECTORS

> `const` **SELECTORS**: `object`

Defined in: [src/standards/ERC20.ts:15](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/standards/ERC20.ts#L15)

ERC-20 function selectors
First 4 bytes of keccak256 hash of function signature

#### Type Declaration

##### allowance

> `readonly` **allowance**: `"0xdd62ed3e"` = `"0xdd62ed3e"`

allowance(address,address)

##### approve

> `readonly` **approve**: `"0x095ea7b3"` = `"0x095ea7b3"`

approve(address,uint256)

##### balanceOf

> `readonly` **balanceOf**: `"0x70a08231"` = `"0x70a08231"`

balanceOf(address)

##### decimals

> `readonly` **decimals**: `"0x313ce567"` = `"0x313ce567"`

decimals()

##### DOMAIN\_SEPARATOR

> `readonly` **DOMAIN\_SEPARATOR**: `"0x3644e515"` = `"0x3644e515"`

DOMAIN\_SEPARATOR()

##### name

> `readonly` **name**: `"0x06fdde03"` = `"0x06fdde03"`

name()

##### nonces

> `readonly` **nonces**: `"0x7ecebe00"` = `"0x7ecebe00"`

nonces(address)

##### permit

> `readonly` **permit**: `"0xd505accf"` = `"0xd505accf"`

permit(address,address,uint256,uint256,uint8,bytes32,bytes32)

##### symbol

> `readonly` **symbol**: `"0x95d89b41"` = `"0x95d89b41"`

symbol()

##### totalSupply

> `readonly` **totalSupply**: `"0x18160ddd"` = `"0x18160ddd"`

totalSupply()

##### transfer

> `readonly` **transfer**: `"0xa9059cbb"` = `"0xa9059cbb"`

transfer(address,uint256)

##### transferFrom

> `readonly` **transferFrom**: `"0x23b872dd"` = `"0x23b872dd"`

transferFrom(address,address,uint256)

## Functions

### decodeAddress()

> **decodeAddress**(`data`): `string`

Defined in: [src/standards/ERC20.ts:190](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/standards/ERC20.ts#L190)

Decode address return value

#### Parameters

##### data

`string`

#### Returns

`string`

***

### decodeApprovalEvent()

> **decodeApprovalEvent**(`log`): `object`

Defined in: [src/standards/ERC20.ts:158](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/standards/ERC20.ts#L158)

Decode Approval event log

#### Parameters

##### log

###### data

`string`

###### topics

`string`\[]

#### Returns

`object`

##### owner

> **owner**: `string`

##### spender

> **spender**: `string`

##### value

> **value**: [`Type`](../../primitives/Uint.mdx#type)

***

### decodeBool()

> **decodeBool**(`data`): `boolean`

Defined in: [src/standards/ERC20.ts:198](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/standards/ERC20.ts#L198)

Decode bool return value

#### Parameters

##### data

`string`

#### Returns

`boolean`

***

### decodeString()

> **decodeString**(`data`): `string`

Defined in: [src/standards/ERC20.ts:205](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/standards/ERC20.ts#L205)

Decode string return value

#### Parameters

##### data

`string`

#### Returns

`string`

***

### decodeTransferEvent()

> **decodeTransferEvent**(`log`): `object`

Defined in: [src/standards/ERC20.ts:133](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/standards/ERC20.ts#L133)

Decode Transfer event log

#### Parameters

##### log

###### data

`string`

###### topics

`string`\[]

#### Returns

`object`

##### from

> **from**: `string`

##### to

> **to**: `string`

##### value

> **value**: [`Type`](../../primitives/Uint.mdx#type)

***

### decodeUint256()

> **decodeUint256**(`data`): [`Type`](../../primitives/Uint.mdx#type)

Defined in: [src/standards/ERC20.ts:183](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/standards/ERC20.ts#L183)

Decode uint256 return value

#### Parameters

##### data

`string`

#### Returns

[`Type`](../../primitives/Uint.mdx#type)

***

### encodeAllowance()

> **encodeAllowance**(`owner`, `spender`): `string`

Defined in: [src/standards/ERC20.ts:116](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/standards/ERC20.ts#L116)

Encode allowance(address,address) calldata

#### Parameters

##### owner

[`AddressType`](../../primitives/Address.mdx#addresstype)

##### spender

[`AddressType`](../../primitives/Address.mdx#addresstype)

#### Returns

`string`

***

### encodeApprove()

> **encodeApprove**(`spender`, `amount`): `string`

Defined in: [src/standards/ERC20.ts:71](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/standards/ERC20.ts#L71)

Encode approve(address,uint256) calldata

#### Parameters

##### spender

[`AddressType`](../../primitives/Address.mdx#addresstype)

##### amount

[`Type`](../../primitives/Uint.mdx#type)

#### Returns

`string`

***

### encodeBalanceOf()

> **encodeBalanceOf**(`account`): `string`

Defined in: [src/standards/ERC20.ts:105](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/standards/ERC20.ts#L105)

Encode balanceOf(address) calldata

#### Parameters

##### account

[`AddressType`](../../primitives/Address.mdx#addresstype)

#### Returns

`string`

***

### encodeTransfer()

> **encodeTransfer**(`to`, `amount`): `string`

Defined in: [src/standards/ERC20.ts:59](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/standards/ERC20.ts#L59)

Encode transfer(address,uint256) calldata

#### Parameters

##### to

[`AddressType`](../../primitives/Address.mdx#addresstype)

##### amount

[`Type`](../../primitives/Uint.mdx#type)

#### Returns

`string`

***

### encodeTransferFrom()

> **encodeTransferFrom**(`from`, `to`, `amount`): `string`

Defined in: [src/standards/ERC20.ts:86](https://github.com/evmts/voltaire/blob/bd6ec34405c15ad8cd51d11579d495dc53813482/src/standards/ERC20.ts#L86)

Encode transferFrom(address,address,uint256) calldata

#### Parameters

##### from

[`AddressType`](../../primitives/Address.mdx#addresstype)

##### to

[`AddressType`](../../primitives/Address.mdx#addresstype)

##### amount

[`Type`](../../primitives/Uint.mdx#type)

#### Returns

`string`