http://e26whn2524322mkxb3cbyk27ev2ihhq2biz35hty7gzgsyrwrygq27yd.onion/posts/blog/security/346-don-t-use-web2tor.html
Aside from the details above, there're other considerations to be made too. Using Tor2Web allows user/onion correlation, and allows these services to enumerate valid onions (which some, apparently, then sell on). Onion.cab publishes a list here - https://onion.cab/list.php Wherever possible, always use an official endpoint.