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​
Signature

wrapFetchWithPayment(
  fetch: typeof globalThis.fetch,
  walletClient: WalletClient,
  maxValue?: string,
  paymentRequirementsSelector?: (r402: Response402) => PaymentRequirements
): typeof globalThis.fetch

​
Notes

  • maxValue: the maximum allowed payable amount (strongly recommended)
  • paymentRequirementsSelector: custom selector for requirements

​
Full signature and types

import type { WalletClient } from "viem";

type PaymentRequirementsSelector = (
  requirements: PaymentRequirements[],
  network?: string[],
  scheme?: string
) => PaymentRequirements;

interface X402Config {
  svmConfig?: {
    rpcUrl?: string;
  };
  evmConfig?: {
    rpcUrls?: Record<number, string>;
  };
}

wrapFetchWithPayment(
  fetch: typeof globalThis.fetch,
  walletClient: WalletClient,
  maxValue?: bigint,
  paymentRequirementsSelector?: PaymentRequirementsSelector,
  config?: X402Config
): typeof globalThis.fetch;
Tip: choose a conservative default for maxValue; in production, set it explicitly to prevent excessive payments.