import { MempoolUTXO, NetworkFees, OutspendStatus, TxInfo, UtxoInfo } from './types';
/**
 * Default mempool API URLs by network.
 */
export declare const MEMPOOL_API_URLS: {
    readonly mainnet: "https://mempool.space/api";
    readonly testnet: "https://mempool.space/testnet/api";
    readonly signet: "https://mempool.space/signet/api";
};
/**
 * Push a signed transaction to the Bitcoin network.
 *
 * @param txHex - The signed transaction hex string
 * @param apiUrl - Mempool API base URL
 * @returns The transaction ID
 * @throws Error if broadcasting fails
 */
export declare function pushTx(txHex: string, apiUrl: string): Promise<string>;
/**
 * Get transaction information from mempool.
 *
 * @param txid - The transaction ID
 * @param apiUrl - Mempool API base URL
 * @returns Transaction information
 */
export declare function getTxInfo(txid: string, apiUrl: string): Promise<TxInfo>;
/**
 * Get the current block tip height.
 *
 * Source: mempool.space API — `GET /api/blocks/tip/height` returns the height
 * of the most recent block as a plain-text integer.
 *
 * @param apiUrl - Mempool API base URL
 * @returns The height of the most recent block
 * @throws Error if the response is not a whole number
 */
export declare function getTipHeight(apiUrl: string): Promise<number>;
/**
 * Get the spend status of a specific transaction output.
 *
 * Calls the esplora-compatible `GET /tx/{txid}/outspend/{vout}` endpoint
 * (mempool.space backend, mempool/electrs `rest.rs`). Returns
 * `{ spent: false }` for an unspent output, or
 * `{ spent: true, txid, vin, status }` when the output has been spent.
 *
 * @param txid - The transaction id whose output is being checked (no 0x prefix)
 * @param vout - The output index
 * @param apiUrl - Mempool API base URL
 * @returns The output's spend status
 */
export declare function getOutspend(txid: string, vout: number, apiUrl: string): Promise<OutspendStatus>;
/**
 * Get the hex representation of a transaction.
 *
 * @param txid - The transaction ID
 * @param apiUrl - Mempool API base URL
 * @returns The transaction hex string
 * @throws Error if the request fails or transaction is not found
 */
export declare function getTxHex(txid: string, apiUrl: string): Promise<string>;
/**
 * Get UTXO information for a specific transaction output.
 *
 * This is used for constructing PSBTs where we need the witnessUtxo data.
 * Only supports Taproot (P2TR) and native SegWit (P2WPKH, P2WSH) script types.
 *
 * @param txid - The transaction ID containing the UTXO
 * @param vout - The output index
 * @param apiUrl - Mempool API base URL
 * @returns UTXO information with value and scriptPubKey
 */
export declare function getUtxoInfo(txid: string, vout: number, apiUrl: string): Promise<UtxoInfo>;
/**
 * Get all UTXOs for a Bitcoin address.
 *
 * @param address - The Bitcoin address
 * @param apiUrl - Mempool API base URL
 * @returns Array of UTXOs sorted by value (largest first)
 */
export declare function getAddressUtxos(address: string, apiUrl: string): Promise<MempoolUTXO[]>;
/**
 * Get the mempool API URL for a given network.
 *
 * @param network - Bitcoin network (mainnet, testnet, signet)
 * @returns The mempool API URL
 */
export declare function getMempoolApiUrl(network: "mainnet" | "testnet" | "signet"): string;
/**
 * Transaction summary from address transactions endpoint.
 */
export interface AddressTx {
    txid: string;
    status: {
        confirmed: boolean;
        block_height?: number;
    };
}
/**
 * Get recent transactions for a Bitcoin address.
 *
 * Returns the last 25 confirmed transactions plus any unconfirmed (mempool) transactions.
 * This is useful for checking if a specific transaction has been broadcast.
 *
 * @param address - The Bitcoin address
 * @param apiUrl - Mempool API base URL
 * @returns Array of recent transactions
 */
export declare function getAddressTxs(address: string, apiUrl: string): Promise<AddressTx[]>;
/**
 * Fetches Bitcoin network fee recommendations from mempool.space API.
 *
 * @param apiUrl - Mempool API base URL
 * @returns Fee rates in sat/vbyte for different confirmation times
 * @throws Error if request fails or returns invalid data
 *
 * @see https://mempool.space/docs/api/rest#get-recommended-fees
 */
export declare function getNetworkFees(apiUrl: string): Promise<NetworkFees>;
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