import type { X402PaymentRequirements } from './types.js';
export type BuildChallengeInput = {
    asset: string;
    network: string;
    payTo: string;
    amount: string | number | bigint;
    resource: string;
    description?: string;
    mimeType?: string;
    maxTimeoutSeconds?: number;
    extra?: {
        name?: string;
        version?: string;
    };
};
export type X402ChallengeBody = {
    x402Version: 1;
    accepts: X402PaymentRequirements[];
    error?: string;
};
export declare const buildChallenge: (input: BuildChallengeInput) => X402ChallengeBody;
export type DecodedXPayment = {
    x402Version: number;
    scheme: string;
    network: string;
    payload: {
        signature: string;
        authorization: {
            from: string;
            to: string;
            value: string;
            validAfter: string;
            validBefore: string;
            nonce: string;
        };
    };
};
export declare const decodeXPaymentHeader: (header: string | undefined | null) => DecodedXPayment;
export declare const USDC_DECIMALS = 6;
export declare const usdc: (network: string) => {
    contract: string;
    domain: {
        name: string;
        version: string;
    };
    decimals: number;
} | undefined;
export declare const isMainnet: (network: string) => boolean;
export declare const isTestnet: (network: string) => boolean;
export declare const explorerTxUrl: (network: string, txHash: string | undefined | null) => string | null;
export declare const formatUsdc: (baseUnits: number | bigint | string, opts?: {
    symbol?: boolean;
}) => string;
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