BTC/USD rate is a free Chrome add-on developed by medicine28. It provides users with real-time updates on the exchange rate between Bitcoin (BTC) and the US Dollar (USD) from the BTC-E exchange. The extension automatically refreshes every 1 minute to ensure that users have the most up-to-date information.

This add-on is particularly useful for casual traders who are interested in monitoring the BTC/USD rate. It allows them to quickly check the current exchange rate without the need to visit a separate website or application. With the information provided by BTC/USD rate, users can make informed decisions regarding their Bitcoin trading activities.

Please note that the developer has provided donation information for those who find this extension useful. However, it is important to avoid sharing personal information or contacting the developer directly.