/**
 * Check if a symbol is a known cryptocurrency (case-insensitive).
 * Backed by the CoinGecko list in crypto-symbols-data.ts —
 * run 'npm run update-crypto' to refresh.
 *
 * @example
 * isCryptoSymbol("BTC") // true
 * isCryptoSymbol("btc") // true
 * isCryptoSymbol("DOGE") // true
 */
export declare function isCryptoSymbol(symbol: string): boolean;
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