iStockPhoto

Triggers: !istock, !istockphoto, !stockphotos

Try it

Kagi would openhttps://www.istockphoto.com/search/2/image?phrase=cats

Run !istock in Kagi

URL pattern: https://www.istockphoto.com/search/2/image?phrase=query

Searches www.istockphoto.com, filed under Images.