5.21.2 release

1. Add spot cross margin API support

5.15.2 Release

For security concern, since 5.15.2, all private endpoints support are removed from javascript SDK, as it is intended to support browser usage. NodeJS applications are recommended to switch to our brand new NodeJS SDK
which is written using TypeScript(can be compiled to javascript).

The NodeJS SDK are targeting NodeJS only, with no intended support for using in browsers.