Error 503 during use of DeepLX

[ukushu]

Terminal:

DeepL X has been successfully launched! Listening on 0.0.0.0:1188
Developed by sjlleo <i@leo.moe> and missuo <me@missuo.me>.
[GIN] 2025/09/03 - 13:30:48 | 503 |  800.640125ms |       127.0.0.1 | POST     "/translate"
[GIN] 2025/09/03 - 13:31:58 | 503 |  613.579834ms |       127.0.0.1 | POST     "/translate"

Reply from code:

Status code: 503
Response data: {"code":503,"message":"too many requests, your IP has been blocked by DeepL temporarily, please don't request it frequently in a short time"}
Translation failed

Why it's reply 503 from DeepL?
Why not 127.0.0.1/ 0.0.0.0 / localhost / DeeplX?
Is I am doing something wrong?

I have tried request in my code to:
"http://127.0.0.1:1188/translate"
"http://0.0.0.0:1188/translate"
Same result.

Isn't DeeplX is a local app?