import type { Logger } from "pino";
import type { ProviderUsage } from "../../server/messages.js";
import type { ProviderApiFetch, ProviderUsageFetcher } from "./provider.js";
export interface ProviderUsageServiceOptions {
    logger: Logger;
    fetchers?: ProviderUsageFetcher[];
    fetch?: ProviderApiFetch;
    cacheTtlMs?: number;
    now?: () => number;
}
export interface ProviderUsageListResult {
    fetchedAt: string;
    providers: ProviderUsage[];
}
export declare class ProviderUsageService {
    private readonly logger;
    private readonly fetchers;
    private readonly cacheTtlMs;
    private readonly now;
    private cached;
    private inFlight;
    constructor(options: ProviderUsageServiceOptions);
    listUsage(options?: {
        forceRefresh?: boolean;
    }): Promise<ProviderUsageListResult>;
    private fetchFreshUsage;
}
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