best cloud solution for json request - java

I am working on a little android app that will be requesting json data 3 times a day, this json data will be populated base on data that is fetch from 3 different web sites.
My question is what cloud solution will allow me to used some sort of script/language (python,perl or java) to fetch the data within the cloud itself(make the fetching automatic) from the these site and make it available in a json friendly format so my app can fetch it .
One of the AWS services I have been looking at was API gateway but i don't see a way of me fetching the data from within AWS to later make it public as a json API.
thanks in advance for the help

Have you considered running scheduled events on AWS Lambda - https://docs.aws.amazon.com/lambda/latest/dg/invoking-lambda-function.html#supported-event-source-scheduled-events

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For the database portion if you decide not to use Firebase, please do not Raw SQLite you will have nightmares, use something like Realm it is NoSQL ,fast and easy to perform database transactions.

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