Free Grok 4.3 API

curl https://api.cloudflare.com/client/v4/accounts/$CF_ACCOUNT_ID/ai/run/xai/grok-4.3 \
  -H "Authorization: Bearer $CF_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"messages":[{"role":"user","content":"Explain black holes in one sentence."}]}'

// Cloudflare Worker: no extra key/env; Grok is billed directly by Cloudflare
export default {
  async fetch(request, env) {
    const res = await env.AI.run('xai/grok-4.3', {
      messages: [{ role: 'user', content: 'Explain black holes in one sentence.' }],
    });
    return Response.json(res);
  },
};