AI AGENT STARTUP IDEA FOR YOU ($15B market) Yesterday, a friend mailed my newborn a stuffed manatee from Canada, the CUTEST thing, and then I got HIT with $93 in tariffs just to receive it which is more than the manatee cost!! The more I realized this is happening to MILLIONS of people right now, because between the new tariffs and the way cross-border shipping works, everyone's getting surprise fees at the door. A big chunk of those fees are either overcharged, misclassified, or straight up refundable,

GREG ISENBERG on X: "AI AGENT STARTUP IDEA FOR YOU ($15B market) Yesterday, a friend mailed my newborn a stuffed manatee from Canada, the CUTEST thing, and then I got HIT with $93 in tariffs just to receive it which is more than the manatee cost!! The more I realized this is happening to MILLIONS… / X

GREG ISENBERG

@gregisenberg

AI AGENT STARTUP IDEA FOR YOU ($15B market) Yesterday, a friend mailed my newborn a stuffed manatee from Canada, the CUTEST thing, and then I got HIT with $93 in tariffs just to receive it which is more than the manatee cost!! The more I realized this is happening to MILLIONS of people right now, because between the new tariffs and the way cross-border shipping works, everyone's getting surprise fees at the door. A big chunk of those fees are either overcharged, misclassified, or straight up refundable, and nobody has the patience to sit on hold with customs to find out. HOW IT'D BUILD THIS The whole thing starts as an agent that reads your customs and shipping paperwork, the commercial invoice, the HS code they slapped on your package, the duty they charged, and checks it against what you should have actually been charged, because a shocking amount of this stuff gets misclassified by whoever filled out the form in a warehouse. When the agent finds an overcharge, it files the refund claim for you, and you split whatever comes back. Zero risk to the customer, which is the whole reason they'll say yes. HOW I'D GROW THIS I'd make content around the pain they already feel, videos and posts of people reacting to insane import fees on normal stuff, a $93 tariff on a stuffed animal, a $200 fee on a pair of shoes, and every one of those becomes a lead magnet where you drop in "paste your receipt and we'll tell you in 30 seconds if you got overcharged." You can also lean into all the people that hate Trump and his tarriffs, no doubt that’s gonna work. THE WEDGE That free checker is the little wedge product you build. Most people find out they overpaid, you file for them, and now you've got a customer who tells every other person who's ever been burned at the door. HOW TO SCALE Once you've got volume on the consumer side, there’s a huge business in the data. You'll know exactly which shippers, which product categories, and which customs brokers overcharge the most, and that's a B2B product every ecommerce company and freight forwarder would pay for, because they're eating these errors at scale and they prob have no idea. You basically start by getting one person their $93 back, and you end up owning the layer that catches customs errors for everyone. TLDR; More startup ideas like this at

ideabrowser.com

(literally free to sign up) ~$15 billion in tariff refunds goes unclaimed every year because 80% of people owed money never file. Getting people money back is one of the best business models there is, because it's pure upside for the customer (you only pay if you win), and there are a dozen of these hiding in plain sight, medical bill overcharges, property tax appeals, unclaimed refunds, and now customs. Love this business model, love this idea, and hey, someone is going to build it, might as well be you? Good time to be building this too. This app would be killer for holiday season. What do you think of the idea?

3:30 PM · Sep 2, 2026

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