import type { Agent } from "../agent.js";
import type { AuthPayload, Facilitator, PayOptions } from "./base.js";
/**
 * Coinbase x402 flavor — `PAYMENT-REQUIRED` / `PAYMENT-SIGNATURE` headers.
 *
 * Reference: github.com/coinbase/x402
 *
 * Detection works today. Payment execution requires an EVM key + the
 * EIP-3009 `transferWithAuthorization` flow; scheduled for SDK 0.3.x.
 */
export declare const PAYMENT_REQUIRED_HEADER = "PAYMENT-REQUIRED";
export declare const PAYMENT_SIGNATURE_HEADER = "PAYMENT-SIGNATURE";
export declare const PAYMENT_RESPONSE_HEADER = "PAYMENT-RESPONSE";
export declare class CoinbaseX402Facilitator implements Facilitator {
    static readonly name = "coinbase-x402";
    readonly name = "coinbase-x402";
    static detect(resp: Response): boolean;
    buildAuth(resp: Response, _agent: Agent, opts: PayOptions): Promise<AuthPayload>;
}
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