import { Connection, Keypair } from '@solana/web3.js';
/** Sign a backend-built unsigned transaction (base64) and submit it. */
export declare function signAndSubmitBase64(connection: Connection, wallet: Keypair, txBase64: string): Promise<string>;
export declare function fetchJson<T>(url: string, init?: RequestInit): Promise<T>;
/** Uniform MCP text result (bigint-safe — the gate SDK returns bigint units). */
export declare function textResult(data: unknown): {
    content: {
        type: 'text';
        text: string;
    }[];
};
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