/**
 * Four.meme REST API authentication.
 *
 * Flow:
 *   1. POST /v1/private/user/nonce/generate  → get nonce
 *   2. Sign message "You are sign in Meme {nonce}" with wallet private key
 *   3. POST /v1/private/user/login/dex       → get access_token
 *
 * The access_token is used for subsequent API calls (upload, create).
 */
import type { Hex } from 'viem';
export type AuthResult = {
    accessToken: string;
    walletAddress: string;
};
/**
 * Authenticate with Four.meme and return an access token.
 */
export declare function authenticateFourmeme(privateKey: Hex, options?: {
    fetchImpl?: typeof fetch | undefined;
}): Promise<AuthResult>;
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