> For the complete documentation index, see [llms.txt](https://docs.chainrpc.io/chainrpc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.chainrpc.io/chainrpc/networks/arbitrum/how-to/authenticate-requests.md).

# Authenticate requests

Arbitrum uses the [same authentication methods as Ethereum](broken://pages/lTxO1iltT2qnJDQop2pa) to secure credentials and authenticate requests when using the Ethereum APIs via HTTPS.

{% hint style="warning" %}
WebSocket calls are not supported when using the Arbitrum endpoints.
{% endhint %}