Hi,
I have good experience in zapier platform. I have developed 2 custom zapier apps for the customer to send a xml request to their API (Action part) and check the RSS feed and trigger their API (trigger app).
I can deliver you the javascript code to trigger Knack and QuickBase app.
Also, I like to know more about your requirement. Because if you want some manual trigger to create records on these app. I have some other idea.
Looking for long term relationship,
Sathish