/** Truncate an Ethereum address for display: 0x1234...abcd */
export declare function formatAddress(address: string, chars?: number): string;
/** Format a BigInt token amount with decimal places.
 *  F-9: Handles negative amounts correctly by working with the absolute value
 *  and prepending a minus sign.
 *  When maxFractionDigits is specified, rounds (>=5 up) instead of truncating.
 */
export declare function formatTokenAmount(amount: bigint, decimals: number, maxFractionDigits?: number): string;
/** Format USDC amount (6 decimals) */
export declare function formatUSDC(amountMicro: bigint): string;
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