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{
  "error": {
    "message": "Rate limit exceeded.",
    "type": "rate_limit_error",
    "param": null,
    "code": "rate_limit_exceeded"
  }
}

import time
import httpx

def call_with_retry(payload, max_retries=3):
    for attempt in range(max_retries):
        response = httpx.post(
            "https://api.dana.expert/v1/chat/completions",
            headers={"Authorization": f"Bearer {DANA_API_KEY}"},
            json=payload,
        )
        if response.status_code == 429:
            wait = 2 ** attempt  # 1s, 2s, 4s
            time.sleep(wait)
            continue
        response.raise_for_status()
        return response.json()
    raise Exception("Rate limit exceeded after retries")