import type { Context, Env, Next } from 'hono';
import { type SupportedChainName } from '@azeth/common';
/** Minimal Hono env for pre-settled payment middleware.
 *  Consumer apps can extend this with their own variables. */
export interface ProviderEnv extends Env {
    Variables: {
        paymentFrom: `0x${string}`;
        paymentAmount: bigint;
        paymentTxHash: `0x${string}`;
    };
}
/** Pre-settled payment verification middleware.
 *
 *  Checks for X-Payment-Tx header. If present, verifies the transaction on-chain
 *  by decoding USDC Transfer event logs and confirming the payment meets requirements.
 *
 *  When valid: sets context variables (paymentFrom, paymentAmount, paymentTxHash)
 *  and calls next() — downstream x402 middleware should be skipped.
 *
 *  When invalid: falls through to let x402 middleware handle normally.
 */
export declare function preSettledPaymentMiddleware(config: {
    payTo: `0x${string}`;
    usdcAddress: `0x${string}`;
    priceAtomicAmount: bigint;
    rpcUrl?: string;
    chainName?: SupportedChainName;
    /** N5 fix: invoked once per freshly-verified pre-settled payment with
     *  (resource pathname, on-chain payer). Wire to AzethSIWxStorage.recordPayment
     *  so a later SIWx-only request from the same payer is granted access instead
     *  of re-settling (double-charge fix). The payer is the on-chain Transfer
     *  `from` (the smart account) — exactly the address SIWx presents. */
    recordPayment?: (resource: string, payer: `0x${string}`) => void;
}): (c: Context<ProviderEnv>, next: Next) => Promise<void>;
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