Xumm SDK 
Universal SDK, to build Web3 Apps, xApps and backend integrations
One SDK for frontend (browser), backend (node/ts) & xApp (SDK & frontend interaction).
This SDK lives on NPM (beta) as xumm: package/xumm.
Documentation
CDN
The CDN location for this pacakge for VannilaJS use: here.
https://xumm.app/assets/cdn/xumm.min.js