👋 Hi Product Hunt! Every programmatic ad impression carries a claim about who's allowed to sell it. A publisher's ads.txt says "these exchanges may sell my inventory." An exchange's sellers.json says "these publishers are my sellers." Two files, two parties, describing the same relationship — and until now, nobody checked whether they actually agreed. That's Lumorrow Verify. It continuously crawls both sides of the market — right now that's 554,000+ domains and 25.7M+ ads.txt records — and reconciles them against each other. A publisher can see exactly which of their declared sellers the exchanges actually corroborate, and which don't. A buyer can paste the SupplyChain object from a bid request and resolve every hop against what each exchange independently says. What I didn't expect going in: this "drift" is everywhere. Not fraud, usually — a reseller added for one campaign in 2021 and never removed, an account ID that quietly belongs to someone else's account, the same seller declared both DIRECT and RESELLER in the same file. None of it is malicious. All of it looks identical to spoofing from the buy side, so the path just gets discounted or skipped, and the publisher never learns why. What's free, no account needed: Look up any domain and see its full ads.txt / sellers.json record Validate a SupplyChain object from any bid request What's paid (from $49/mo): continuous monitoring, change alerts, the full per-line report, CSV export, and API access. Crawl freshness is identical on every plan, including free — plans only decide how much you watch, never how current the data is. I'd love it if you tried it on a domain you actually know well and told me if the result matches what you'd expect — that's the single most useful thing anyone could do for me today. And if you're on the buy or sell side of programmatic, I want to hear whether this matches what you're already seeing internally. Thanks for checking it out — happy to answer anything below. 🙏 — Jomith George

Lumorrow Verify

Continuous ads.txt, app-ads.txt and sellers.json monitoring

Continuous ads.txt, app-ads.txt and sellers.json monitoring