Is there any feature/API of sendgrid that is not offered in its integration with Google App Engine? -

sendgrid standalone product. there sendgrid integrated google app engine. there feature or api available in standalone sendgrid (e.g. event api / webhooks) not available in sendgrid integrated google app engine?

sendgrid isn't integrated app engine. use same sendgrid apis regardless of whether calling them app engine or somewhere else.

sendgrid have several pricing plans (bronze, silver, etc.) , 1 of pricing plans specific app engine because of marketing agreement google. sendgrid has detailed explanation of features each plan here.

it isn't clear me whether "app engine" plan explicitly restricted use app engine. ip address filtering expect not use app engine plan.