> For the complete documentation index, see [llms.txt](https://saseul-gold.gitbook.io/saseul-gold-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://saseul-gold.gitbook.io/saseul-gold-docs/backend-api/using-backend-api.md).

# Using Backend API

Because network request & transaction is a costly task, immersive data provides data to applications in the form of caching at the back end and indexing metadata.

**$BACKEND\_URL=<http://3.36.127> .229:9090**