This is a custom script created to help automatically update your prices on items in your bazaar on Torn.com. By default it sets your item to $1 below the lowest other items on the market to get your sales to the top of the list.
First, install the script using Tampermonkey or whatever script extension you use.
Next, go to your Bazaar and then to the Add items page.
You'll see two new buttons at the top...
Click the configure button to add your API key and setup the options you want for the script.
Then click "Start Auto Pricer" to begin pricing your items.