Do the online name snipers actually work?

[Showering]

do those websites like mc sniper actually snipe the name or is it a scam?

 

[Loser]

Chearful isn’t a scam

 

[Megumin]

Chearful is good. Very high success rate. Most other snipers, if they ask for money to buy an og or semi, would be a scam because most can't beat chearful at this time.

 

[blob]

stop listening to these uglies despite chearful having over 4000 successful snipes and being trusted for over 3 years Chearful is a fat scam they like snipe your name and then give it to you its so simple its obviously a scam!!11!

 

[Chearful]

In other words, yes i think my sniper works

 

[Zyger]

Of course they do. Just be sure to go with one that isn't shady and has real people vouching for it like Chearful's site.
A web application can have access to the same resources and apis that a command-line script that runs on a server somewhere has.
From a technical perspective, all a sniper is really doing is making a few HTTP web requests programmatically. One to login to the Mojang site and grab the necessary tokens and another to send a POST request with the correct payload to the username change endpoint. The tricky part comes down to timing.

I'm pretty sure it's not like that anymore, there's different methods now.