/**
 * ClawPay Tiered Fee Structure
 *
 * Fee tiers based on transfer amount:
 * - < $10:     2%   (e.g., $0.20 on $10)
 * - $10-$100:  1%   (e.g., $1.00 on $100)
 * - $100-$1000: 0.5% (e.g., $5.00 on $1000)
 * - > $1000:   0.25% (e.g., $25 on $10,000)
 *
 * b402 uses its own Railgun fork with 0% protocol fees (vs upstream 0.25% each way)
 */
export interface FeeResult {
    inputAmount: bigint;
    feeAmount: bigint;
    recipientAmount: bigint;
    feePercent: number;
    treasuryMPK: string;
    treasuryVPK: string;
}
/**
 * Calculate fee tier based on amount in human-readable USD
 * @param amountUsd Amount in USD (human-readable, e.g., 100.50)
 * @returns Fee in basis points (e.g., 100 = 1%)
 */
export declare function getFeeBasisPoints(amountUsd: number): number;
/**
 * Calculate fee for a transfer
 * @param amount Amount in wei (bigint)
 * @param decimals Token decimals (default 18)
 * @returns Fee calculation result
 */
export declare function calculateFee(amount: bigint, decimals?: number): FeeResult;
/**
 * Format fee for display
 * @param feeResult Fee calculation result
 * @param symbol Token symbol
 * @param decimals Token decimals
 */
export declare function formatFee(feeResult: FeeResult, symbol: string, decimals?: number): string;
/**
 * Get fee preview for a given amount (without actual calculation)
 * Useful for UI display before transaction
 */
export declare function previewFee(amountUsd: number): {
    percent: number;
    estimatedFee: number;
};
/**
 * Check if fee collection is enabled
 * Can be disabled via environment variable for testing
 */
export declare function isFeesEnabled(): boolean;