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Launch & Discovery Guides

Practical guides on launching products, getting discovered, and reaching the right audience - written for founders and developers.

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LatestProgrammatic

ads.txt and sellers.json: How Publishers Declare Who May Sell Their Ad Space, and How Buyers Check It

ads.txt lists the ad companies allowed to sell a website's ad space; sellers.json and the SupplyChain object show who is behind each seller account. The line format, DIRECT vs RESELLER, the crawler rules, and the four checks a buyer runs on one bid request.

MediaProNet Editorial Team

October 17, 20269 min read