This website provides a valid sellers.json file.
https://iabtechlab.com/sellers-json/
Advertising · ads txt · Seller JSON
Get access to data on 2,275 websites that are Sellers Json Provider Publisher Customers. We know of 1,647 live websites using Sellers Json Provider Publisher and an additional 628 sites that used Sellers Json Provider Publisher historically and 839 websites in the United States.
Get a list of 2,275 websites using Sellers Json Provider Publisher which includes location information, hosting data, contact details, 1,647 currently live websites and an additional 9,755 domains that redirect to sites in this list. 628 sites that used this technology previouslyand 839 websites in the United States currently using Sellers Json Provider Publisher.
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