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Zwaptz
Two people at a round pavement café table, laughing as they exchange a camera bag and a small cardboard box across it, with street life and other tables behind them.
One message carries the whole arrangement. No haggling thread.
Two pairs of hands over a dark slate table, one passing a parcel wrapped in brown paper and tied with string to the other.
Chat opens on acceptance, and not before.

07  ·  The app

The offer is the whole message

You put things on each side, send it, and the other person answers once for the whole arrangement. No haggling thread, no opening pleasantries, no phone numbers.

  1. 01

    You make an offer

    One of your things for one of theirs, or several for several — up to twelve items on the asking side. Both bands are shown, so you can both see the shape of it before anybody agrees.

  2. 02

    They accept, decline, or say what was wrong

    A decline can carry a short reason chosen from a list, so you know whether you were close. If it was not right, send a different offer rather than asking about it.

  3. 03

    Chat opens on acceptance, and not before

    This costs something and it is worth naming what. An open message box on an offer nobody agreed to is the cheapest way to reach a stranger who never asked to be reached.

    The first thing it usually carries is a phone number — after which the swap happens somewhere else, nobody confirms a handover, and there is nothing for anyone to read if it goes wrong.

  4. 04

    You meet, and you both confirm

    Both of you say the handover happened, and only then does it count as done. Neither person can claim a completed swap alone.

    Where to meet is suggested rather than left to the two of you to invent — see meeting places.

Either of you can call it off.

Right up until somebody confirms the handover. The items go straight back to the people who put them up, and back onto the site exactly as they were.

That exists because agreeing moves both items into each other’s vaults immediately. Without a way back, a swap that fell through would leave you both holding a record of something neither of you received.

If they never turned up, this is the same button. You are not stuck with a swap that did not happen.

At dusk, a laughing woman in a doorway hands a folded tartan blanket to a smiling man on the step, warm hall light behind her and geraniums in pots beside the door.
You both confirm the handover. Only then is it done.

Keeping an eye on something

Every item somebody else holds carries “Keep an eye on this” beside the swap button. It saves the item to a list at the bottom of your vault and does nothing else — it reserves nothing, joins no queue, and tells the owner nothing about you.

What the owner sees is a number: “3 people are keeping an eye on this”. Never who, and never when.

It exists so that an item nobody has offered for yet does not look identical to an item nobody wants, which is the difference between leaving something up and taking it down.

Once somebody has confirmed

The cancel button goes. At that point a person is saying the exchange physically happened, and unpicking that is a disagreement between two people rather than something a button should settle.

Report the swap and an administrator can read the whole conversation. What you received lands in your vault, off the site until you list it again.

The Zwaptz how-it-works page, laying out the steps from photographing an item to arranging the handover.
The offer carries the whole arrangement. No haggling thread.
Two people at a round pavement cafe table exchanging a black camera bag and a boxed coffee machine across it, with a busy shopping street behind them.
They accept, decline, or say what was wrong. One answer.