Message Limit per hour for ChatGPT API?

I have a ChatGPT API key and when i run my code (supposed to send about 2000 prompts to the model), it gets stuck after some prompts. I was previously able to send all requests (about 1.5 months ago) but now im not able to. Is there a message limit imposed on the API key now? I also don’t get any error, it just shows that the code is running but no progress is made.

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