List your Pokémon cards with a HIGH and LOW price. Buyers negotiate the spread. A single coin flip settles the deal — no haggling, just fate.
50/50
Fair odds
3%
Platform fee
1hr
Hold window
Set a HIGH price (best case) and a LOW price (acceptable case). The spread is your negotiation range.
Buyers can accept your spread, or counter with their own HIGH/LOW. Back-and-forth until both sides agree.
Once agreed, a provably fair coin flip determines the price. Buyer calls HEADS or TAILS — no one can predict the outcome.
Funds transfer automatically. Buyer pays the flip result price, vendor receives it minus our 3% fee.
Charizard VMAX
Near Mint · Darkness Ablaze
HIGH Price
$120.00
Vendor nets $116.40
LOW Price
$60.00
Vendor nets $58.20
Platform fee: 3%, capped at $15
$120.00 → fee: $3.60 → vendor gets $116.40
$60.00 → fee: $1.80 → vendor gets $58.20
Our provably fair algorithm uses cryptographic hashing. You can verify every flip outcome independently.
Before negotiation starts, we generate a random server seed. We show you its SHA-256 hash — so we can't change it after the fact.
Your browser generates a client seed before the flip. Both seeds are visible to both parties — neither side can hide anything.
Result = HMAC-SHA256(serverSeed, clientSeed + nonce) mod 2. Zero = HEADS, One = TAILS. After the flip, we reveal the server seed so you can verify.
// Flip verification (run this yourself)
const crypto = require('crypto');
const serverSeed = "<revealed after flip>";
const clientSeed = "<shown before flip>";
const nonce = 1;
const hmac = crypto.createHmac('sha256', serverSeed);
hmac.update(`${clientSeed}:${nonce}`);
const result = parseInt(hmac.digest('hex').slice(0,8), 16) % 2;
// 0 = HEADS, 1 = TAILS
Funds held, not spent
When an offer is accepted, we hold your HIGH price amount. Your actual balance stays intact — the hold is just a reservation.
1-hour flip window
Once accepted, you have one hour to flip. After that, the hold is released and the listing goes back to active.
Multi-offer juggling
Your available balance = total balance − all held amounts. Make multiple offers as long as the math works out.
Cancel anytime
Changed your mind? Cancel before the flip. Hold is released instantly, no questions asked.
You can still make more offers as long as your available balance covers the HIGH price.
🪙
Join thousands of traders settling deals the fairest way possible.