Yeah I forgot my node can do all that haha. The whole idea of bitcoin is not to query any api unless it is the one you control.
I will probably install rpc explorer and query that endpoint. Thanks

sandbeach123

bitcoin

api for detecting onchain payment with specific amount for specific address

I think you would have to play with zmq settings in bitcoin.conf and then read those notifications. 
Sorry I don't exactly how to do it but I know that zmq feature is used for that.

Try better here
https://bitcoin.stackexchange.com/search?q=zmq+notification