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Hi @mertozsoy,
Thanks for reaching out!
The error message appears because you have reached your monthly limit.
With the developer API, users receive 500 free optimizations each calendar month. Free users are limited to 500 compressions. If you would like to compress more images, you can upgrade the API account to the paid plan on the account dashboard (https://tinify.com/dashboard/api). You can read more about pricing at https://tinypng.com/developers#pricing.
Hope this helps!
