Free to use?

Hi there,

your validation is awesome and I like to use it in my own seotool. My
customers should check their websites and should also get informations
about bad code.

Is your checker over https://validator.w3.org/nu/?out=json and curl-request
free to use? Is there any restrictions, or can i use it in my commercial
seotool.

Kind regards and Happy New Year

Kind regards
Michael

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