/erc20/metadata error

Hello! I’m trying to develop a function to get erc20 tokens metadata in Python.
I’m using the /erc20/metadata method by URL, but with some problems.
If I want to extract USDT metadata, the URL will be


However the response I get it’s

The error for USDT is gone if I request two or more erc20 tokens:


Could someone explain to me why this is happening?
The example’s with USDT token but happens with other erc20 tokens.

I will check a little later.

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