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

# EVM Exact Payment Scheme

> EIP-3009 transferWithAuthorization payment handlers

# exact

## Type Aliases

### eip712Domain

> **eip712Domain** = *typeof* `eip712Domain.infer`

Defined in: [packages/payment-evm/src/exact/constants.ts:97](https://github.com/faremeter/faremeter/blob/main/packages/payment-evm/src/exact/constants.ts#L97)

***

### x402ExactPayload

> **x402ExactPayload** = *typeof* `x402ExactPayload.infer`

Defined in: [packages/payment-evm/src/exact/constants.ts:79](https://github.com/faremeter/faremeter/blob/main/packages/payment-evm/src/exact/constants.ts#L79)

## Variables

### EIP712\_TYPES

> `const` **EIP712\_TYPES**: `object`

Defined in: [packages/payment-evm/src/exact/constants.ts:64](https://github.com/faremeter/faremeter/blob/main/packages/payment-evm/src/exact/constants.ts#L64)

#### Type declaration

##### TransferWithAuthorization

> `readonly` **TransferWithAuthorization**: readonly \[\{ `name`: `"from"`; `type`: `"address"`; }, \{ `name`: `"to"`; `type`: `"address"`; }, \{ `name`: `"value"`; `type`: `"uint256"`; }, \{ `name`: `"validAfter"`; `type`: `"uint256"`; }, \{ `name`: `"validBefore"`; `type`: `"uint256"`; }, \{ `name`: `"nonce"`; `type`: `"bytes32"`; }]

***

### eip712Domain

> `const` **eip712Domain**: `Type`\<\{ `chainId?`: `number`; `name?`: `string`; `verifyingContract?`: `string`; `version?`: `string`; }, \{ }>

Defined in: [packages/payment-evm/src/exact/constants.ts:97](https://github.com/faremeter/faremeter/blob/main/packages/payment-evm/src/exact/constants.ts#L97)

Validator for EIP-712 domain parameters provided in payment requirements.

***

### TRANSFER\_WITH\_AUTHORIZATION\_ABI

> `const` **TRANSFER\_WITH\_AUTHORIZATION\_ABI**: readonly \[\{ `inputs`: readonly \[\{ `name`: `"from"`; `type`: `"address"`; }, \{ `name`: `"to"`; `type`: `"address"`; }, \{ `name`: `"value"`; `type`: `"uint256"`; }, \{ `name`: `"validAfter"`; `type`: `"uint256"`; }, \{ `name`: `"validBefore"`; `type`: `"uint256"`; }, \{ `name`: `"nonce"`; `type`: `"bytes32"`; }, \{ `name`: `"v"`; `type`: `"uint8"`; }, \{ `name`: `"r"`; `type`: `"bytes32"`; }, \{ `name`: `"s"`; `type`: `"bytes32"`; }]; `name`: `"transferWithAuthorization"`; `outputs`: readonly \[]; `stateMutability`: `"nonpayable"`; `type`: `"function"`; }, \{ `inputs`: readonly \[\{ `name`: `"authorizer"`; `type`: `"address"`; }, \{ `name`: `"nonce"`; `type`: `"bytes32"`; }]; `name`: `"authorizationState"`; `outputs`: readonly \[\{ `name`: `""`; `type`: `"bool"`; }]; `stateMutability`: `"view"`; `type`: `"function"`; }, \{ `inputs`: readonly \[]; `name`: `"name"`; `outputs`: readonly \[\{ `name`: `""`; `type`: `"string"`; }]; `stateMutability`: `"view"`; `type`: `"function"`; }, \{ `inputs`: readonly \[]; `name`: `"version"`; `outputs`: readonly \[\{ `name`: `""`; `type`: `"string"`; }]; `stateMutability`: `"view"`; `type`: `"function"`; }, \{ `inputs`: readonly \[]; `name`: `"DOMAIN_SEPARATOR"`; `outputs`: readonly \[\{ `name`: `""`; `type`: `"bytes32"`; }]; `stateMutability`: `"view"`; `type`: `"function"`; }]

Defined in: [packages/payment-evm/src/exact/constants.ts:13](https://github.com/faremeter/faremeter/blob/main/packages/payment-evm/src/exact/constants.ts#L13)

***

### X402\_EXACT\_SCHEME

> `const` **X402\_EXACT\_SCHEME**: `"exact"` = `"exact"`

Defined in: [packages/payment-evm/src/exact/constants.ts:11](https://github.com/faremeter/faremeter/blob/main/packages/payment-evm/src/exact/constants.ts#L11)

***

### x402ExactPayload

> `const` **x402ExactPayload**: `Type`\<\{ `authorization`: \{ `from`: (`In`) => `Out`\<`` `0x${string}` ``>; `nonce`: (`In`) => `Out`\<`` `0x${string}` ``>; `to`: (`In`) => `Out`\<`` `0x${string}` ``>; `validAfter`: `string`; `validBefore`: `string`; `value`: `string`; }; `signature`: (`In`) => `Out`\<`` `0x${string}` ``>; }, \{ }>

Defined in: [packages/payment-evm/src/exact/constants.ts:79](https://github.com/faremeter/faremeter/blob/main/packages/payment-evm/src/exact/constants.ts#L79)

Validator for the x402 exact payment payload containing
an EIP-3009 authorization and signature.

## Functions

### createFacilitatorHandler()

> **createFacilitatorHandler**(`chain`, `privateKey`, `assetNameOrInfo`, `opts`): `Promise`\<`FacilitatorHandler`>

Defined in: [packages/payment-evm/src/exact/facilitator.ts:70](https://github.com/faremeter/faremeter/blob/main/packages/payment-evm/src/exact/facilitator.ts#L70)

Creates a facilitator handler for the EVM exact payment scheme.

The handler verifies EIP-3009 authorization signatures and executes
the transferWithAuthorization call on the token contract.

#### Parameters

##### chain

`ChainInfoWithRPC`

Chain configuration including RPC URLs

##### privateKey

`string`

Private key for signing settlement transactions

##### assetNameOrInfo

`AssetNameOrContractInfo`

Asset name or contract info for the token

##### opts

`CreateFacilitatorHandlerOpts` = `{}`

Optional configuration for network and transport

#### Returns

`Promise`\<`FacilitatorHandler`>

A FacilitatorHandler for processing EVM exact payments

***

### createPaymentHandler()

> **createPaymentHandler**(`wallet`, `opts`): `PaymentHandler`

Defined in: [packages/payment-evm/src/exact/client.ts:59](https://github.com/faremeter/faremeter/blob/main/packages/payment-evm/src/exact/client.ts#L59)

Creates a payment handler for the EVM exact payment scheme.

The handler generates EIP-3009 transferWithAuthorization signatures
that can be executed by the facilitator to complete payments.

#### Parameters

##### wallet

`WalletForPayment`

Wallet providing chain context and signing capabilities

##### opts

`CreatePaymentHandlerOpts` = `{}`

Optional configuration for the asset

#### Returns

`PaymentHandler`

A PaymentHandler function for use with the x402 client