Goofish Monitor watches Xianyu for the secondhand deals you actually want, checking listings around the clock and alerting you when a match appears at the right price. Describe what you are hunting in plain language and the AI judge turns it into analysis criteria, or skip the model and write exact keyword rules yourself. Each task carries its own keywords, price range, listing age window, and province, city, and district filters, and several tasks run side by side without stepping on each other. Results land in a browsable page with price history, so you can see whether a seller dropped the price or relisted the same item. When something matches, notifications fan out to ntfy, Telegram, Bark, WeChat Work, or a generic webhook, which means the good deals reach your phone before someone else grabs them. Cron schedules let tasks wake on your timetable, accounts can be bound per task, and proxy rotation with retries keeps longer monitoring runs alive. The management interface covers task creation, account login states, prompt editing, run logs, and system settings, so diagnosis happens in the browser instead of a log file. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.