I need to monitor the pending information of the block in real-time. Currently, using the free one can only be used for more than ten minutes and prompt for payment. May I ask if there is a usage limit for paid ones? Also, it seems that I cannot pay with my Chinese credit card
Hey xk 
,
Are you using QuickAlerts to monitor the pending information?
We use Stripe, a global payment processor. Please try with a different card if possible.
-Nick