API Token
Your API token is
When sending requests to Queryfeed or submitting a feed's URL to an RSS reader, ensure the URL contains the token. For example:
https://queryfeed.net/instagram?q=nasa&token=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Without the token, your request will be considered as an anonymous one and thus no Pro features will apply.
Paypal subscription
Once you have enabled the monthly subscription, you will perform queries better. See the Pricing page for more details. You can see all the operations in your Paypal history. You may cancel the subcription any time you want.