For SimpleX I have created this one:

https://github.com/lft3t8bx/Robosats-Orderbook-Alert-Bot-for-SimpleX-Chat

But it is not for trade notifications.

I think  nostr:npub1v3tgrwwsv7c6xckyhm5dmluc05jxd4yeqhpxew87chn0kua0tjzqc6yvjh is working for NOSTR notifications. 

Right now If you use the android app, there are inbuilt notifications over tor, this is probably the safest approach we have right now.