> For the complete documentation index, see [llms.txt](https://docs.xyo.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.xyo.network/developers/sdk-reference.md).

# Public SDK Reference

Public npm libraries for building with XYO Protocol and XYO Layer One.

This reference covers supported libraries that are publicly available from npm.

## Choose a library

<table data-view="cards"><thead><tr><th></th><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td>XL1</td><td><strong>Chain applications</strong></td><td>Connect to XL1 from TypeScript or React through published SDK entry points.</td><td><a href="/developers/sdk-reference/xl1-libraries.md">XL1 Libraries</a></td></tr><tr><td>XYO</td><td><strong>Protocol data</strong></td><td>Work with public payload, schema, account, Bound Witness, and module APIs.</td><td><a href="/developers/sdk-reference/xyo-protocol-libraries.md">XYO Protocol Libraries</a></td></tr><tr><td>Storage</td><td><strong>Archivist adapters</strong></td><td>Use the published S3-compatible archivist library and its public provider profiles.</td><td><a href="/developers/sdk-reference/storage-libraries.md">Storage Libraries</a></td></tr></tbody></table>

{% hint style="info" %}
The npm package page and exported TypeScript declarations are the source of truth. Packages are rechecked before they are added to this reference.
{% endhint %}


---

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