export { BASE_CHAIN_ID } from "./chains.js";
export type HexString = `0x${string}`;
export declare const X402_VERSION = 1;
export declare const X402_SCHEME = "exact";
export declare const X402_NETWORK = "base";
export declare const X402_TOKEN_SYMBOL = "usdc";
export declare const X402_USDC_CONTRACT: "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913";
export declare const X402_PAY_TO_ADDRESS = "0xa6a8736f18f383f1cc2d938576933e5ea7df01a1";
export declare const X402_VALUE_MICRO_USDC = "1000";
export declare const X402_VALUE_USDC_DISPLAY = "0.001";
export declare const X402_AUTH_VALID_AFTER = "0";
export declare const X402_AUTH_TTL_SECONDS = 300;
export declare const USDC_EIP712_DOMAIN_NAME = "USD Coin";
export declare const USDC_EIP712_DOMAIN_VERSION = "2";
export declare const X402_TRANSFER_PRIMARY_TYPE = "TransferWithAuthorization";
export type X402AuthorizationPayload = {
    from: string;
    to: string;
    value: string;
    validAfter: string;
    validBefore: string;
    nonce: HexString;
};
export type X402PaymentPayload = {
    x402Version: number;
    scheme: string;
    network: string;
    payload: {
        signature: string;
        authorization: X402AuthorizationPayload;
    };
};
export type X402TypedDataDomain = {
    name: string;
    version: string;
    chainId: number;
    verifyingContract: HexString;
};
export type X402TypedDataTypes = {
    EIP712Domain: Array<{
        name: string;
        type: string;
    }>;
    TransferWithAuthorization: Array<{
        name: string;
        type: string;
    }>;
};
export type X402ValidationPolicy = {
    requiredNetwork?: string;
    requiredPayTo?: string;
    requiredValue?: string;
    requireUnexpired?: boolean;
    nowSeconds?: number;
};
export type FarcasterX402Spec = {
    network: typeof X402_NETWORK;
    tokenSymbol: typeof X402_TOKEN_SYMBOL;
    token: X402TypedDataDomain["verifyingContract"];
    payTo: X402AuthorizationPayload["to"];
    amount: X402AuthorizationPayload["value"];
    amountDisplay: typeof X402_VALUE_USDC_DISPLAY;
    defaultValidAfter: typeof X402_AUTH_VALID_AFTER;
    authTtlSeconds: typeof X402_AUTH_TTL_SECONDS;
    domain: X402TypedDataDomain;
    types: X402TypedDataTypes;
    primaryType: typeof X402_TRANSFER_PRIMARY_TYPE;
};
export type FarcasterX402SigningRequest = FarcasterX402Spec & {
    authorization: X402AuthorizationPayload;
    validAfter: number;
    validBefore: number;
    encodePayment(signature: string): string;
};
export declare function createX402AuthorizationNonce(): HexString;
export declare function buildX402AuthorizationPayload(params: {
    from: string;
    to?: string;
    value?: string | number | bigint;
    validAfter?: string | number | bigint;
    validBefore: string | number | bigint;
    nonce?: string;
}): X402AuthorizationPayload;
export declare function buildX402PaymentPayload(params: {
    signature: string;
    authorization: X402AuthorizationPayload;
    x402Version?: number;
    scheme?: string;
    network?: string;
}): X402PaymentPayload;
export declare function buildX402TypedDataDomain(overrides?: Partial<X402TypedDataDomain>): X402TypedDataDomain;
export declare function buildX402TypedDataTypes(): X402TypedDataTypes;
export declare function buildFarcasterX402Spec(): FarcasterX402Spec;
export declare function buildFarcasterX402SigningRequest(params: {
    payerAddress: string;
    nowSeconds?: number;
    validAfter?: number;
    validBefore?: number;
    ttlSeconds?: number;
    nonce?: string;
}): FarcasterX402SigningRequest;
export declare function encodeX402PaymentPayload(payload: X402PaymentPayload): string;
export declare function assertX402PaymentPayload(value: unknown): X402PaymentPayload;
export declare function isX402PaymentPayload(value: unknown): value is X402PaymentPayload;
export declare function decodeX402PaymentPayload(xPaymentBase64: string): X402PaymentPayload;
export declare function validateX402PaymentPayload(payload: X402PaymentPayload, policy?: X402ValidationPolicy): X402PaymentPayload;
export declare function decodeAndValidateX402PaymentPayload(xPaymentBase64: string, policy?: X402ValidationPolicy): X402PaymentPayload;