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 Running push notifications is so cheap. 

We are currently serving 48,216 public keys that activated Push from 4046 online relays at an average of 3 DMs/Zaps per second for $34 dollars/mo. 

That's $0.0007/user/month.

And I am running this with a single javascript server on Heroku. It's neither optimized, not the cheapest host. 
 I like stats 

nostr:nevent1qqsfje4f5jh90j2s4zz4epc6uxsluydelxq860t7rs38p645v7cgghgpz9mhxue69uhkummnw3ezuamfdejj7q3qgcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqxpqqqqqqz2ghyyt 
 My notifications haven't worked in a long while 😅 
 Know issue if you are using amber. This will be fixed next release  
 I do. Thanks. 
 Oh so that's why I don't receive notifications 😅 
 Wait but I'm just using amber on 0xchat amd fountain so I should be getting notifications on amethyst anyway. I just receive zap and dms. 
 Would it be even cheaper for you to run your own server to push notifications? 
 Unfortunately UP notifications don't seem to work properly just yet. 
 IT is cheap if it's not Microsoft 🌞