Arctic Shift does not permit a browser on another domain to read its data, so the pull goes through a relay on your own Cloudflare account. It fetches the data and adds the missing permission. The address check inside it means the relay can only ever reach Arctic Shift.

1. Cloudflare dashboard, Workers & Pages, Create, then Worker. Name it anything.
2. Replace everything in the editor with the code below, then Deploy.
3. Copy the workers.dev address Cloudflare shows you and paste it in the relay box.

export default {
  async fetch(request) {
    const target = new URL(request.url).searchParams.get("u") || "";
    if (!target.startsWith("https://arctic-shift.photon-reddit.com/")) {
      return new Response("blocked", { status: 403 });
    }
    const upstream = await fetch(target);
    return new Response(upstream.body, {
      status: upstream.status,
      headers: {
        "content-type": "application/json",
        "access-control-allow-origin": "*"
      }
    });
  }
}