> ## Documentation Index
> Fetch the complete documentation index at: https://wb-21fd5541-wbdocs-1882.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Why am I getting rate limit errors (429) with W&B Inference?

Rate limit errors (429) occur when you exceed concurrency limits.

**Error:** "Concurrency limit reached for requests"

**Solution:**

* Reduce the number of parallel requests
* Add delays between requests
* Implement exponential backoff
* Note: Rate limits apply per W\&B project

## Best practices to avoid rate limits

1. **Implement retry logic with exponential backoff:**
   ```python theme={null}
   import time

   def retry_with_backoff(func, max_retries=3):
       for i in range(max_retries):
           try:
               return func()
           except Exception as e:
               if "429" in str(e) and i < max_retries - 1:
                   time.sleep(2 ** i)
               else:
                   raise
   ```

2. **Use batch processing instead of parallel requests**

3. **Monitor your usage in the W\&B Billing page**

## Default spending caps

* **Pro accounts:** \$6,000/month
* **Enterprise accounts:** \$700,000/year

Contact your account executive or support to adjust limits.

***

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