/**
 * x402 v2.11 paid MCP compatibility helpers.
 *
 * These helpers keep buyer-facing documentation, tests, and downstream
 * Streamable HTTP gateways aligned on the same header names and receipt links.
 */
export declare const X402_V211_PAYMENT_SIGNATURE_HEADER = "Payment-Signature";
export declare const X402_V211_DEPRECATED_PAYMENT_HEADERS: string[];
export declare const X402_V211_RECEIPT_HEADER = "payment-response";
export declare const X402_V211_MCP_SESSION_HEADER = "mcp-session-id";
export declare const X402_V211_BROWSER_EXPOSED_HEADERS: string[];
export type SupportedReceiptChainId = 8453 | 84532;
export type X402V211CompatibilityProof = {
    paymentSignatureHeader: typeof X402_V211_PAYMENT_SIGNATURE_HEADER;
    deprecatedPaymentHeaders: string[];
    responseHeaders: string[];
    corsExposeHeaders: string;
    streamableHttpSequence: string[];
    supportedReceiptChains: Array<{
        chainId: SupportedReceiptChainId;
        name: string;
        explorerTxBaseUrl: string;
        x402Network: string;
    }>;
};
export declare function buildCorsExposeHeaders(existing?: string[]): string;
export declare function buildReceiptLink(chainId: number, txHash: string): string;
export declare function x402V211CompatibilityProof(): X402V211CompatibilityProof;
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