/**
 * Ripple/XRP Chain Adapter
 *
 * Builds XRP Ledger transactions, attaches secp256k1 ECDSA signatures
 * from the FROST threshold signing network, and broadcasts via XRPL API.
 *
 * Requires: npm install xrpl
 */
import { ChainAdapter, RippleTransaction } from '../core/types';
export declare class RippleAdapter implements ChainAdapter {
    private rpcUrl;
    private network;
    private xrpl;
    constructor(network?: 'mainnet' | 'testnet' | 'devnet', rpcUrl?: string);
    getRpcUrl(): string;
    /**
     * Build an unsigned XRP payment transaction.
     *
     * XRP uses a custom binary format. The signing payload is computed
     * via encodeForSigning() which prepends a hash prefix. FROST signs
     * SHA-512Half (first 32 bytes of SHA-512) of the encoded bytes.
     */
    buildTransaction(tx: RippleTransaction, fromAddress: string): Promise<string>;
    getSigningPayload(unsignedTx: string): string;
    /**
     * Attach a secp256k1 ECDSA signature to the XRP transaction.
     * XRP uses DER-encoded signatures in the TxnSignature field.
     */
    attachSignature(unsignedTx: string, signature: string): Promise<string>;
    /**
     * Broadcast a signed XRP transaction
     */
    broadcast(signedTx: string): Promise<string>;
    /**
     * Get XRP balance in drops
     */
    getBalance(address: string): Promise<string>;
}
export declare function createRippleAdapter(rpcUrl?: string): RippleAdapter;
export declare function createRippleTestnetAdapter(rpcUrl?: string): RippleAdapter;
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