Yes! USPS makes their rate tables available for download to a CSV file from USPS.com.
To download rate tables via CSV file from USPS.com:
- Navigate to USPS' Mailing & Shipping Prices page
- Click the Downloadable Files link.
- Click the CSV file next to the service(s) you are looking for.
- Once the file(s) downloads to your computer, open the file(s).