import { type WalletClient, type Chain, type Transport, type Account } from 'viem';
export interface SignedRequest {
    signature: `0x${string}`;
    nonce: string;
    created: number;
    keyid: `0x${string}`;
}
/** Sign an HTTP request with ERC-8128 */
export declare function signRequest(walletClient: WalletClient<Transport, Chain, Account>, signer: `0x${string}`, method: string, url: string, body?: string): Promise<SignedRequest>;
/** Build the ERC-8128 Authorization header value */
export declare function buildAuthHeader(signed: SignedRequest): string;
/** Create a fetch wrapper that automatically adds ERC-8128 auth headers */
export declare function createSignedFetch(walletClient: WalletClient<Transport, Chain, Account>, signer: `0x${string}`): typeof fetch;
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