> ## 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.

# API error code 429 - Concurrency limit reached for requests

A 429 error with the message "Concurrency limit reached for requests" means you're sending too many concurrent requests to the W\&B Inference API.

## Why this happens

W\&B Inference enforces concurrency limits to ensure fair usage and service stability. When the number of simultaneous requests from your account exceeds the allowed limit, additional requests are rejected with a 429 status code.

## What you can do

1. **Reduce concurrent requests**
   * Implement request queuing or throttling in your application
   * Use exponential backoff when retrying failed requests

2. **Increase your limits**
   * Review your plan's concurrency limits and upgrade if needed

For more information, see [Usage information and limits](/inference/usage-limits/).

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<Badge stroke shape="pill" color="orange" size="md">[Quotas & Rate Limits](/support/inference/tags/quotas-rate-limits)</Badge>