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Connection & Usage

Q1: Why does my request return 401?

Your API key is missing, invalid or expired. Verify the Authorization: Bearer ... header and confirm the key is active in your dashboard.

Q2: Why does the client fail to connect?

Check whether the Base URL is correct, whether /v1 is required by the client and whether your local network can reach https://123api.co.

Q3: Why do I get 429 rate limit errors?

Reduce request frequency, add retries with backoff and spread traffic across workers if you are sending bursts.

Q4: Why is a model ID reported as unsupported?

Query GET /v1/models first and use the exact model ID returned by your current account and environment.

When a third-party client reports vague connection errors, the fastest check is to run a direct curl test against https://123api.co/v1/chat/completions with the same key.