/**
 * X402 payment protocol types.
 */
/** Payment requirement returned by the server in the 402 response. */
export interface PaymentRequirement {
    scheme: string;
    network: string;
    maxAmountRequired: string;
    maxTimeoutSeconds: number;
    resource: string;
    description: string;
    payTo: string;
    asset: string;
    extra?: {
        name?: string;
        version?: string;
        chainId?: number;
        verifyingContract?: string;
        decimals?: number;
        computeUnitLimit?: number;
        computeUnitPriceMicroLamports?: number;
        rpcUrl?: string;
        facilitatorAddress?: string;
        proxyAddress?: string;
        permit2Address?: string;
    };
}
/** Full 402 response body. */
export interface PaymentRequiredResponse {
    x402Version: number;
    accepts: PaymentRequirement[];
    error?: string;
}
/** The X-Payment header envelope before base64 encoding. */
export interface X402PaymentEnvelope {
    x402Version: number;
    scheme: string;
    network: string;
    payload: SolanaPayload | EVMPayload | EVMUptoPayload;
}
/** Solana payload in wallet-fee-payer mode: just the on-chain transaction signature. */
export interface SolanaPayload {
    signature: string;
}
/** EVM payload (`exact` scheme): EIP-3009 TransferWithAuthorization + ECDSA signature. */
export interface EVMPayload {
    authorization: EVMAuthorization;
    signature: string;
}
export interface EVMAuthorization {
    from: string;
    to: string;
    value: string;
    validAfter: string;
    validBefore: string;
    nonce: string;
}
/** EVM payload (`upto` scheme): Permit2 PermitWitnessTransferFrom + ECDSA signature. */
export interface EVMUptoPayload {
    permit2Authorization: Permit2WitnessAuthorization;
    signature: string;
}
export interface Permit2WitnessAuthorization {
    from: string;
    spender: string;
    nonce: string;
    deadline: string;
    permitted: {
        token: string;
        amount: string;
    };
    witness: {
        to: string;
        facilitator: string;
        validAfter: string;
    };
}
/** Wallet adapter interface for Solana. */
export interface SolanaWalletAdapter {
    publicKey: {
        toBase58(): string;
        toString(): string;
    };
    /** Wallet sends the transaction and returns the submitted signature. */
    signAndSendTransaction(tx: unknown): Promise<string | {
        signature: string;
    }>;
}
/** Wallet adapter interface for EVM (EIP-1193 provider). */
export interface EVMProvider {
    request(args: {
        method: string;
        params?: unknown[];
    }): Promise<unknown>;
}