In general, our API doesn't allow for batch operations. There's one exception: You can archive links or add or remove tags from links, up to 100 links at once.
All other actions, like shortening links, creating QR Codes, or getting metrics for a link, need to be done one at a time.
For example, if you want to shorten 500 links, you need to call the POST /v4/shorten or POST /v4/bitlinks endpoint 500 times — once for each link. If you have access to a developer, they can create a script that repeats the API call until all of your links have been shortened.