/**
 * Input Validation Service
 *
 * Provides comprehensive input validation for all user inputs
 * to prevent injection attacks, invalid data, and loss of funds
 */
export declare class ValidationError extends Error {
    field: string;
    code: string;
    constructor(message: string, field: string, code: string);
}
export declare class ValidationService {
    /**
     * Validate Polkadot/Substrate address
     */
    static validateAddress(address: string, fieldName?: string): void;
    /**
     * Validate and parse crypto amount
     */
    static validateAndParseAmount(amount: string, fieldName?: string, options?: {
        min?: string;
        max?: string;
        decimals?: number;
    }): bigint;
    /**
     * Validate fiat amount
     */
    static validateFiatAmount(amount: number, currency: string, fieldName?: string): void;
    /**
     * Validate and sanitize string
     */
    static validateString(value: string, fieldName: string, options?: {
        required?: boolean;
        minLength?: number;
        maxLength?: number;
        pattern?: RegExp;
        allowedChars?: RegExp;
    }): string;
    /**
     * Validate external ID (for payments)
     */
    static validateExternalId(externalId: string): string;
    /**
     * Validate expiration seconds
     */
    static validateExpiration(expirationSeconds: number, fieldName?: string): void;
    /**
     * Validate currency code
     */
    static validateCurrency(currency: string): string;
    /**
     * Validate URL
     */
    static validateUrl(url: string, fieldName?: string, required?: boolean): void;
    /**
     * Validate email (basic validation)
     */
    static validateEmail(email: string, fieldName?: string, required?: boolean): void;
    /**
     * Validate payment metadata
     */
    static validateMetadata(metadata: Record<string, unknown>): void;
    /**
     * Validate IPFS hash
     */
    static validateIPFSHash(hash: string, required?: boolean): void;
}
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