> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sim.dune.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Cloudflare Proxy

> Learn how to set up a Cloudflare Worker to securely proxy your Sim API requests, protecting your API key from client-side exposure.

Protect your Sim API key when making requests from client-side apps by using a Cloudflare Worker as a proxy.
This worker receives requests from your app, securely adds your `SIM_API_KEY` on the server, and then forwards the requests to the Sim API endpoints.

**When to use a proxy:**

* Your app makes Sim API calls from the browser (React, Next.js client components, etc.)
* You need to avoid exposing your API key in client-side JavaScript
* You need to handle CORS for browser-based requests

**When you don't need a proxy:**

* Server-to-server calls (Node.js backends, Python scripts, etc.) can call the Sim API directly

We provide a one-click-deploy Cloudflare Worker to simplify this setup.
Find detailed instructions in our GitHub repo:

<Card title="Sim API Proxy on GitHub" icon="github" horizontal href="https://github.com/duneanalytics/sim-proxy">
  One-click deployment and comprehensive setup instructions for the Cloudflare Worker proxy.
</Card>