How money flows
Backd routes money; it never holds it. Every dollar goes from a wallet you control, to an order on Polymarket, and back to the same wallet when the market settles.
The flow
- Deposit.
USDC on Polygon lands in your Backd wallet: a Polymarket deposit wallet created for you at sign-up, controlled by your signature alone.
- Back a call.
Backd builds a signed order for the side you picked, at the live price, for your stake, and sends it to Polymarket's order book. It fills against real buyers and sellers, at the same price you'd get on Polymarket.
- Hold, or sell early.
Your shares sit in your wallet. If the price moves your way you can sell at any time the market is open.
- Settle.
Polymarket resolves the market. Winning shares pay $1 each; Backd redeems them into your wallet. Losing shares expire at zero.
- Withdraw.
Send USDC to any Polygon address. Minimum $1, no maximum, 5 to 20 seconds.
What happens when you back a call
You pick Yes at 58% and stake $10. Backd asks Polymarket's order book for 17.24 Yes shares at up to 58¢. Sellers fill it. Polymarket takes Backd's 1% fee (10¢) from the stake. You now hold 17.24 shares that pay $1 each if Yes happens. The call is recorded at 58% on Backd, signed by the server, and nobody can change it.
Who holds what
| Thing | Where it lives | Who can move it |
|---|---|---|
| Your USDC | Your Backd wallet (Polygon) | You, with your signature |
| Your shares (positions) | Your Backd wallet | You. Backd can place sell and redeem orders you've authorised, nothing else. |
| The order book | Polymarket's exchange contracts | Polymarket's matching engine |
| Your record | Backd's database | Backd's server, write-once. Not you, not us, after the fact. |
The Polymarket part
Backd is a Polymarket builder: it uses Polymarket's official API with full attribution. Orders placed through Backd execute at the same prices as on Polymarket and count as Polymarket activity. Polymarket collects Backd's fee; there is no separate Backd fee contract and no Backd pool your money passes through.