How to Handle API 429, Quota, and Rate Limit Errors

If your API connects but suddenly stops working, the most common causes are 429, insufficient quota, or rate limits. They all look like failed requests, but the fixes are different.

Separate the three problem types

Insufficient quota

You may see:

• insufficient quota
• balance not enough
• quota exceeded
• insufficient balance

This means the key is authenticated, but the account or model does not have enough credits.

Rate limit

You may see:

• rate limit
• too many requests
• requests per minute
• tokens per minute
• 429

This means the service received the request, but the client is sending too much traffic in a short time.

Model permission issue

You may see:

• model not allowed
• model not found
• no permission
• unauthorized model

This is not always a credit issue. The key may not have access to the selected model.

Recommended debug order

1. If you see 401, check the API key first.
2. If you see quota, balance, or credits, check account credits.
3. If you see rate limit or 429, reduce concurrency and request frequency.
4. If you see model not found, test with a known available model.
5. Then check whether the client cached an old key.

Temporary fixes

• Reduce parallel tasks.
• Disable automatic retries or loops.
• Use a cheaper model for simple tasks.
• Wait a short while and retry.
• Check whether another client is using the same key.

Long-term fixes

• Create separate keys for heavy tools.
• Use different keys for Cline, Claude Code, and Chatbox.
• Track which tool consumes the most credits.
• Reserve expensive models for tasks that actually need them.

When to buy more credits

If the error clearly says quota, balance, or insufficient credits, it is not a Base URL problem and not a client setup problem. Check platform credits or purchase another API credit pack.

What not to do

Do not change the Base URL just because you see 429. Base URL problems usually look like 404, connection errors, or DNS failures. A 429 is more likely about frequency, credits, or limits.