Fee Payer

Get the fee payer address for Solana networks.

Fee payers are wallet addresses that pay transaction fees when settling payments. This is currently only relevant for Solana networks, where the facilitator sponsors the transaction fee.

getFeePayer()

Get the fee payer address for a specific network.

const feePayer = await facilitator.getFeePayer('solana');

Parameters

NameTypeDescription
networkstringNetwork identifier (e.g., "solana", "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp")

Response

string | undefined

Returns the fee payer address, or undefined if the network has no fee payer configured.

getFeePayerMap()

Get all fee payers mapped by network in a single call.

const feePayerMap = await facilitator.getFeePayerMap();

Response

Record<string, string>

Returns an object mapping network identifiers to fee payer addresses.

Example

import { OpenFacilitator } from '@openfacilitator/sdk';
 
const facilitator = new OpenFacilitator();
 
// Get fee payer for Solana
const feePayer = await facilitator.getFeePayer('solana');
 
// Use in x402 response
const paymentRequirements = {
  scheme: 'exact',
  network: 'solana',
  maxAmountRequired: '1000000',
  asset: 'EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v',
  payTo: recipientAddress,
  extra: {
    feePayer, // Include for x402jobs registry
  },
};

Caching

The SDK caches the response from supported() to avoid redundant API calls. Use clearCache() if you need to refresh:

facilitator.clearCache();
const freshFeePayer = await facilitator.getFeePayer('solana');