The fairest way to agree on a price.
I want to BUY
I'm the buyer — I'll set my maximum price
I want to SELL
I'm the seller — I'll set my minimum price
I have a code
How it Works
One side starts
Buyer or seller — either can initiate. Describe what you're negotiating and submit your secret price.
Share the code
Send the unique BidWix code to the other party — by email, text, or however you like.
The other side submits
They enter their own secret price — without knowing yours.
BidWix reveals the result
If a deal is possible, BidWix suggests a price that's mathematically fair to both sides. If not — no deal, no hard feelings.
Why it's fair
BidWix is inspired by principles of game theory. Like a Nash equilibrium, the system is designed so that honesty is your best strategy — there's no advantage to bluffing when you only get one chance and your price stays secret. The deal price is the geometric mean of both offers, ensuring that buyer and seller each benefit by the same proportional factor. That's mathematical fairness.
Sarah & Tom
Sarah just opened a small bakery and needs a logo. Tom is a freelance designer whose work she loves. But how much should a logo cost? Neither wants to go first.
Tom's absolute minimum for the work is $100. Sarah could stretch to $900 if she absolutely had to — it would hurt, but a great logo is worth it. That's her honest maximum.
They use BidWix. Both submit their secret price.
Result: $300.
Tom earns three times his minimum. Sarah pays a third of what she feared. Both gained by the same factor, so both feel equally good about the deal they made.
That's the geometric mean at work. No awkward back-and-forth — just a fair price, found in one step.
Privacy by design
BidWix works with a simple 6-character code shared between two people. No account needed. No email required. If you choose to provide one, it's only used to send your code and result — nothing else. We don't sell data, build profiles, or collect more than what's needed to run the deal.