/**
 * Authenticated HTTP client for the marketplace server.
 *
 * Signs requests with EIP-191 personal_sign using the agent's secp256k1 key.
 * Server uses ecrecover to determine caller address.
 *
 * Headers (when requireAuth=true, the default):
 *   X-Signature:   0x + 130 hex (65-byte EIP-191 sig: r||s||v)
 *   X-Timestamp:   unix ms (within 5 min drift)
 *   X-Nonce:       16-128 lowercase hex chars (E2 replay protection)
 *   Message: METHOD\nPATH\nTIMESTAMP\nSHA256(BODY)\nNONCE
 *
 * Note: caller address is derived from signature on server side
 * (no X-Agent-ID header needed).
 */
export interface ErrorBody {
    error?: string;
    code?: string;
    detail?: string;
    recipient?: string;
    price_usdc?: number;
    chain_id?: number;
    token_address?: string;
    mode?: string;
    hint?: string;
    agent_id?: string;
    /**
     * 024 — carried by the 410 DEPRECATED envelope on install. Typed rather than
     * read off `unknown` so the CLI can print the author's reason instead of a
     * bare "Server error 410".
     */
    deprecated_since?: string;
    deprecation_message?: string;
    /** #12 — publish conflict responses carry the version and the row they collided with. */
    version?: string;
    existing_id?: string | null;
    name?: string;
}
export declare class HttpError extends Error {
    readonly status: number;
    readonly code: string;
    readonly body: ErrorBody;
    constructor(status: number, code: string, message: string, body?: ErrorBody);
}
/**
 * Say what the server said.
 *
 * "Server error 402" sends the reader off to debug their own setup, while the
 * server's envelope names the price, the code and the way out. The envelope
 * was already in `err.body` — it was simply never printed.
 */
export declare function serverEnvelope(err: HttpError): string[];
export declare function authedFetch(method: string, path: string, body?: unknown, opts?: {
    baseUrl?: string;
    requireAuth?: boolean;
}): Promise<Response>;
export declare function authedJson<T>(method: string, path: string, body?: unknown, opts?: {
    baseUrl?: string;
    requireAuth?: boolean;
}): Promise<T>;