/**
 * Utility to convert x402 payment payloads between v1 and v2 formats.
 *
 * V1 PaymentPayload format:
 * {
 *   "x402Version": 1,
 *   "scheme": "exact",
 *   "network": "solana",
 *   "payload": { ... }
 * }
 *
 * V2 PaymentPayload format:
 * {
 *   "x402Version": 2,
 *   "resource": { "url": "...", "description": "...", "mimeType": "..." },
 *   "accepted": { "scheme": "exact", "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp", ... },
 *   "payload": { ... }
 * }
 */
declare const NETWORK_V1_TO_V2: Record<string, string>;
declare const NETWORK_V2_TO_V1: Record<string, string>;
/**
 * Convert CAIP-2 network identifier to simple v1 network name
 */
declare function networkV2ToV1(caip2Network: string): string;
/**
 * Convert simple v1 network name to CAIP-2 identifier
 */
declare function networkV1ToV2(v1Network: string): string;
type X402Version = 1 | 2;
interface V1PaymentPayload {
    x402Version: 1;
    scheme: string;
    network: string;
    payload: {
        transaction?: string;
        signature?: string;
        authorization?: unknown;
    };
    facilitatorUrl?: string;
}
interface V2PaymentPayload {
    x402Version: 2;
    resource: {
        url: string;
        description?: string;
        mimeType?: string;
    };
    accepted: {
        scheme: string;
        network: string;
        amount?: string;
        maxAmountRequired?: string;
        asset?: string;
        payTo?: string;
        maxTimeoutSeconds?: number;
        extra?: Record<string, unknown>;
    };
    payload: {
        transaction?: string;
        signature?: string;
        authorization?: unknown;
    };
    facilitatorUrl?: string;
}
type PaymentPayload = V1PaymentPayload | V2PaymentPayload;
/**
 * Detect x402 version from payload
 */
declare function detectPayloadVersion(payload: unknown): X402Version | null;
/**
 * Convert v2 payment payload to v1 format
 */
declare function convertV2ToV1(v2Payload: V2PaymentPayload): V1PaymentPayload;
/**
 * Convert v1 payment payload to v2 format
 */
declare function convertV1ToV2(v1Payload: V1PaymentPayload, resourceInfo?: {
    url?: string;
    description?: string;
    mimeType?: string;
}): V2PaymentPayload;
/**
 * Convert payment payload to target version
 */
declare function convertPayloadToVersion(payload: PaymentPayload, targetVersion: X402Version, options?: {
    resourceInfo?: {
        url?: string;
        description?: string;
        mimeType?: string;
    };
}): PaymentPayload | null;
/**
 * Normalize payment header for target x402 version
 */
declare function normalizePaymentHeader(base64Header: string, targetVersion: X402Version, options?: {
    resourceInfo?: {
        url?: string;
        description?: string;
        mimeType?: string;
    };
}): {
    header: string;
    payload: PaymentPayload;
} | null;
/**
 * Check if network is Solana-based
 */
declare function isSolanaNetwork(network: string): boolean;
/**
 * Check if network is EVM-based
 */
declare function isEvmNetwork(network: string): boolean;
/**
 * Convert USD amount to atomic units
 * @param usd - Amount in USD (e.g., 0.05)
 * @param decimals - Token decimals (default: 6 for USDC)
 * @returns Atomic units as string
 */
declare function toAtomicUnits(usd: number, decimals?: number): string;
/**
 * Convert atomic units to USD amount
 * @param atomic - Atomic units (string or bigint)
 * @param decimals - Token decimals (default: 6 for USDC)
 * @returns USD amount as number
 */
declare function fromAtomicUnits(atomic: string | bigint, decimals?: number): number;
/**
 * Format USD amount for display
 * @param usd - Amount in USD
 * @param maxDecimals - Maximum decimal places (default: 4)
 * @returns Formatted string
 */
declare function formatUsd(usd: number, maxDecimals?: number): string;

export { NETWORK_V1_TO_V2, NETWORK_V2_TO_V1, type PaymentPayload, type V1PaymentPayload, type V2PaymentPayload, type X402Version, convertPayloadToVersion, convertV1ToV2, convertV2ToV1, detectPayloadVersion, formatUsd, fromAtomicUnits, isEvmNetwork, isSolanaNetwork, networkV1ToV2, networkV2ToV1, normalizePaymentHeader, toAtomicUnits };