Every second-hand app starts with good intentions and ends up a shop. Not because the people building it want that, but because a price field is a gravity well. Once a number exists, everything bends toward it: search sorts by it, the listing card leads with it, buyers filter on it, and sellers learn to write for it.

We tried it. Early on Brtr had an optional “estimated value” field, purely to help people judge whether a swap was fair. Within a week of internal testing, three things happened.

What the number did

Listings started optimising for the number. People rounded up. Then they rounded up defensively, because they assumed everyone else was rounding up. The estimate stopped describing the item and started describing the negotiating position.

Conversations became haggling. The first message in a thread shifted from “would you swap this for my tripod?” to “your estimate seems high”. That is a worse conversation. It’s adversarial by default, and it’s about a number neither person can verify.

The mismatch became a problem to solve. If my item is 400 and yours is 350, there is now a 50 gap sitting between us, and the obvious fix is cash. The moment cash enters, we need payments. The moment we need payments, we need disputes, refunds, chargebacks, and a cut to pay for all of it.

So we deleted the field, and a surprising amount of the product went with it.

What replaced it

The question a trade actually asks isn’t what is this worth? It’s do you want my thing more than you want your thing? That question has no units. It’s answered per-person, and it’s answered honestly, because there’s nothing to game.

In practice this shows up as the Looking for field — the one line on every listing that says what the owner wants back. It’s the most important field in the app and the one people skip most often. A listing with “Nothing Specific” in it is a listing waiting to be guessed at.

There is no mechanism to settle a difference in value. That sounds like a limitation until you notice it’s the thing keeping the product honest.

What we gave up

We should be straight about the cost. No price means no transaction, no transaction means no take rate, and no take rate means Brtr’s business model can’t be the obvious one. We think that’s a fair trade for a product that doesn’t quietly become eBay in eighteen months, but it is a real constraint and we’re not pretending otherwise.

It also means Brtr will never be the right tool for liquidating a garage. If you want cash for forty items, sell them. Brtr is for the narrower, better case: you have one specific thing, someone has another specific thing, and you’d both rather swap than sell.