import { AxiosInstance } from 'axios';
export declare const API_KEY_AUTH_HEADER = "x-pendle-auth";
export interface ApiSigningKeyCredentials {
    keyId: string;
    privateKey: string;
}
export declare class ApiSigningKey {
    readonly keyId: string;
    private readonly key;
    constructor({ keyId, privateKey }: ApiSigningKeyCredentials);
    token(method: string, path: string, lifetimeSeconds?: number): string;
}
export declare function attachApiSigningKey(instance: AxiosInstance, key: ApiSigningKey): number;