path: root/packages/website/md/docs/order_watcher/2/introduction.md

Welcome to the [order-watcher](https://github.com/0xProject/0x-monorepo/tree/development/packages/order-watcher) documentation! OrderWatcher is a daemon that efficiently watches a set of orders, emitting events whenever the validity of an order changes. It can be used by relayers to prune an orderbook, or by traders to keep orders fetched from a Relayer up-to-date.