/**
 * Vendored x402 EVM client-side payment implementation.
 *
 * This replaces the `x402-fetch` and `x402` npm packages to avoid pulling in
 * wagmi, WalletConnect, Reown, MetaMask SDK, Solana SDK, and hundreds of MB
 * of transitive dependencies that are unnecessary for server-side EVM usage.
 *
 * Only EVM payment support is included (Base network), which is all this SDK needs.
 * The x402 protocol specification: https://www.x402.org/
 *
 * @module
 */
import { type WalletClient } from "viem";
/**
 * Create a viem WalletClient configured for x402 payment signing.
 *
 * @param network - Network name (e.g., "base", "base-sepolia")
 * @param privateKey - Hex-encoded private key
 * @returns Configured WalletClient
 */
export declare function createSigner(network: string, privateKey: string): WalletClient;
/**
 * Wrap a fetch function with x402 payment handling.
 *
 * When the wrapped fetch receives a 402 response, it automatically:
 * 1. Parses the payment requirements from the response
 * 2. Signs an EIP-3009 TransferWithAuthorization
 * 3. Retries the request with the signed payment in the X-PAYMENT header
 *
 * The retry calls the raw (unwrapped) fetch directly, so a second 402
 * is returned to the caller as-is without infinite retry loops.
 *
 * @param fetchFn - The fetch function to wrap
 * @param walletClient - Wallet client for signing payments
 * @param maxValue - Maximum payment amount in atomic units (default: 0.1 USDC = 100000)
 * @returns Wrapped fetch function with x402 payment support
 */
export declare function wrapFetchWithPayment(fetchFn: typeof fetch, walletClient: WalletClient, maxValue?: bigint): typeof fetch;
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