What kind of load balancing is being used on the back-end? I called leftpad(str, ch, len) with the length I needed and noticed that is not very scalable because it is blocking.
A better approach I would recommend to those using it is to call the API in a for loop. In my tests, it had performance very close to those I see in C or assembly.
I was a bit turned off that the free version can only handle strings up to 1024 in length. I know you need to make some money, but it is big turn off for a lot of my projects.
Edit: I finally signed up for it but still noticed that I am only allowed to use 1024. I called your customer support line and they said I was calling the API from multiple IP addresses and for that I need an enterprise license. Please help me with this issue, it is very crucial at this point as my project is in a complete stop because of this.