import type { ResourceServerExtension } from '@x402/core/types';
/** Payment agreement terms advertised in the 402 response.
 *  Tells clients they can create an on-chain agreement instead of paying per-request. */
export interface AgreementTerms {
    /** Service payee address */
    payee: `0x${string}`;
    /** Payment token address (e.g., USDC) */
    token: `0x${string}`;
    /** PaymentAgreementModule contract address */
    moduleAddress: `0x${string}`;
    /** Minimum amount per interval in token smallest units */
    minAmountPerInterval: string;
    /** Suggested interval in seconds (e.g., 86400 for daily) */
    suggestedInterval: number;
}
/** Extension key used in 402 response extensions object */
export declare const PAYMENT_AGREEMENT_KEY = "payment-agreement";
/** Create a custom ResourceServerExtension that adds agreement terms to the 402 response.
 *
 *  Clients see in the 402 response:
 *  ```json
 *  {
 *    "extensions": {
 *      "payment-agreement": {
 *        "acceptsAgreements": true,
 *        "terms": { "payee": "0x...", "token": "0x...", ... }
 *      }
 *    }
 *  }
 *  ```
 *
 *  This is a server-side-only extension — it adds metadata to the PaymentRequired
 *  response but does not validate incoming payment payloads. Agreement validation
 *  happens in AzethSIWxStorage.hasPaid().
 */
export declare function createPaymentAgreementExtension(terms: AgreementTerms): ResourceServerExtension;
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