We built our own integration with https://www.tray.com.br/.
Our store https://loja.tokecrie.com.br/

I've implemented several clients with Sage X3 to CommerceBuild: https://www.commercebuild.com/

We're familiar with them.  We'd like to see what other solutions are available.

Have you looked into Magento?

Hey Brett - We (Pixafy) JUST released a new offering for X3 users called erpCommerce - an eCommerce solution that enables companies to launch a fully transactional - B2B AND B2C - and fully Sage X3 ERP integrated website, leveraging Gartner Magic Quadrant leading eCommerce (Magento) and cloud based integration (Boomi) platforms....in 60 days or less.  Our solution allows merchants to go live fast on a standardized offering, but it is built in a way that enables unlimited flexibility and scalability beyond the initial launch and core solution.  Would love to connect offline and talk more.  

We are also doing a webinar next week, that I would love if you joined to learn more - https://register.gotowebinar.com/rt/2908835383537522960