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@faremeter/payment-evm

v0.22.0

Published

EVM payment scheme implementations for x402 protocol (EIP-3009 gasless USDC transfers)

Vulnerabilities

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Links

Maintainers

faremeter-distfaremeter-distalexanderguyalexanderguy

Keywords

faremetertypescriptsdkapix402ai

Readme

@faremeter/payment-evm

EVM payment scheme implementations for the x402 protocol, supporting EIP-3009 gasless USDC transfers.

Installation

pnpm install @faremeter/payment-evm

Features

  • Gasless transfers (EIP-3009)
  • USDC payments on Base, Polygon, Skale, and more
  • EIP-712 typed signatures
  • Facilitator pays gas fees
  • Secure authorization pattern

API Reference

Functions

getTokenBalance

Retrieves the ERC-20 token balance and decimals for an account.

Uses multicall to fetch both values in a single RPC request.

| Function | Type | | ----------------- | ------------------------------------------------------------------------------- | | getTokenBalance | (args: GetTokenBalanceArgs) => Promise<{ amount: bigint; decimals: number; }> |

Parameters:

  • args: - The account, asset, and client configuration

Returns:

The balance amount and token decimals

Interfaces

GetTokenBalanceArgs

Arguments for retrieving an ERC-20 token balance.

| Property | Type | Description | | --------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------- | | account | Address | The wallet address to check the balance for | | asset | Address | The ERC-20 token contract address | | client | { account: undefined; batch?: { multicall?: boolean or { batchSize?: number or undefined; deployless?: boolean or undefined; wait?: number or undefined; } or undefined; } or undefined; cacheTime: number; ... 67 more ...; extend: <const client extends { ...; } and ExactPartial<...>>(fn: (client: Client<...>) => client) => Cl... | Viem public client for querying the chain |

Related Packages

License

LGPL-3.0-only