import type { FetchLike, Tool } from '@modelcontextprotocol/client';
import { type SignerWallet, type PaymentRequiredAccept, type SchemePreference } from './signer.js';
export declare const MCP_PAYMENT_RESPONSE_META_KEY = "x402/payment-response";
export interface X402PaymentCache {
    signature: string | null;
    paymentRequiredTools?: Set<string>;
    lastSettlement?: {
        toolName: string;
        receipt: Record<string, unknown>;
    };
}
export declare function recordPaymentRequiredTool(cache: X402PaymentCache, toolName: string): void;
export declare function withSettlementReceipt<T>(result: T, cache: X402PaymentCache, toolName: string): T;
export interface X402FetchMiddlewareOptions {
    wallet: SignerWallet;
    getToolByName?: (name: string) => Tool | undefined;
    paymentCache: X402PaymentCache;
    schemePreference?: SchemePreference;
}
export declare function createX402FetchMiddleware(baseFetch: FetchLike, options: X402FetchMiddlewareOptions): FetchLike;
export declare function extractAcceptFromPaymentRequired(data: unknown, schemePreference?: SchemePreference): {
    accept: PaymentRequiredAccept;
    resource?: {
        url?: string;
        description?: string;
        mimeType?: string;
    };
} | undefined;
export declare function extractPaymentRequiredFromResult(result: unknown): Record<string, unknown> | undefined;
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