/** Minimal in-memory TTL cache. Not thread-safe — fine for a single-process MCP server. */
declare class TTLCache {
    private store;
    get<T>(key: string): T | undefined;
    set<T>(key: string, value: T, ttlMs: number): void;
    has(key: string): boolean;
    delete(key: string): void;
    /** Remove every key starting with the given prefix. Useful for invalidating "aave:ethereum:*". */
    invalidatePrefix(prefix: string): void;
    clear(): void;
    /**
     * Compute `fn()` if the key is missing or stale, otherwise return the cached value.
     * Concurrent calls for the same key will each compute the value — fine for MVP.
     */
    remember<T>(key: string, ttlMs: number, fn: () => Promise<T>): Promise<T>;
}
export declare const cache: TTLCache;
export {};