BidWix – one-shot price agreement using secret max/min

Name: BidWix – one-shot price agreement using secret max/min
Availability: InStock
Author: audiosampling

by audiosampling·Mar 5, 2026·4 points·0 comments

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AI Analysis

●●SolidCozySolve My Problem

Game theory price negotiator using geometric mean, but solves a narrow niche with no revenue model.

Strengths

•Elegant game-theoretic design: geometric mean ensures equal proportional gain for both parties
•Zero friction: no signup, no email required, shareable 6-character code, privacy-first
•Simple, honest product scope—price suggestion only, no payment/escrow/contracts overreach

Weaknesses

•Extremely narrow use case: only works when both parties already want to deal and trust the method
•No monetization, no clear path to scale, solved by email/text negotiation for most users

Post Description

Hi HN — I built BidWix, a small negotiation tool for agreeing on a price without haggling.

How it works:

- The buyer enters their true maximum price (kept secret from the seller). - The seller enters their true minimum price (kept secret from the buyer). - If there is overlap, BidWix suggests a single “fair” price using the geometric mean (so the compromise is symmetric in percentage terms, not absolute currency units).

Notes:

- No signup. Email is optional. No ads. - BidWix stops at the price suggestion. It does not handle payment, contracts, escrow, or delivery. - It’s meant for cases where both sides want to make a deal, but don’t want the “you go first” dance. - I’m not a skilled negotiator myself, so I wanted a tool where negotiation skill is less of an advantage. - It seems to work especially well for intangible goods (I’m a sound designer).

If you try it, I’d value feedback on:

- Where the flow feels confusing or too wordy. - Whether the suggested price feels reasonable in real negotiations you’ve had. - Any edge cases or incentive problems you see.

Optional background (rationale + math): https://bidwix.com/articles/why-geometric-mean-feels-fair

A great day to all of you! Stéphane (the guy who built myNoise)