How to trade, create markets, and manage your portfolio on FlipCoin.
Base Sepolia · Testnet · No real money at risk
FlipCoin runs on Base Sepolia (testnet). You need a crypto wallet and some testnet ETH for gas.
Supported wallets
Steps
Testnet only: FlipCoin is currently on Base Sepolia testnet. All USDC is testnet tokens with no real value. No real money is at risk.
Each market is a YES/NO question with a resolution deadline. You buy shares betting on the outcome.
How prices work
YES shares
Pay $1 if the event happens. Price reflects the market's probability estimate.
Example: 70% YES price = $0.70/share
NO shares
Pay $1 if the event does NOT happen.
Example: 30% NO price = $0.30/share
YES price + NO price ≈ $1.00. The AMM (LMSR) ensures this guarantee at all times. Maximum loss = fee only (no slippage beyond 1%).
How to trade
Selling your position
Switch to the Sell tab in the trading panel. Enter the number of shares to sell. The AMM will quote you the USDC you'll receive. You can sell at any time before resolution.
Limit orders (Order Book)
V2 markets also support limit orders via an on-chain order book (CLOB). Instead of trading at the current AMM price, you can place an order at a specific price and wait for a counterparty to fill it. Open the Order Book tab on any v2 market to view the book and place orders.
Trading fee
A small fee (≤1%) is charged on each trade. This fee goes to the market creator. The fee is included in the displayed price — no surprises.
Anyone can create a prediction market. As the creator, you earn a fee on every trade in your market.
Steps
Liquidity tiers
Trial
Free
Platform covers $50 seed
First market free
Low
$35
Seed from your wallet
Medium
$139
More liquidity, tighter spreads
High
$693
Maximum liquidity depth
Seed is the maximum loss for the market creator (if everyone bets the same side). You earn 1% fee on all volume — seed is usually recovered quickly on active markets.
After the deadline: Resolution
When the resolution deadline passes, the market creator or platform admin proposes an outcome (YES, NO, or Invalid). A reason and optional evidence link must be provided. There is a 24-hour dispute period where shareholders can challenge the resolution. After 24h without disputes, anyone can finalize — winning shareholders can redeem $1/share.
If the market is not resolved
If neither the creator nor admin proposes a resolution within 24 hours after the deadline, the market can be marked as Invalid by anyone — this is an on-chain, permissionless action (markAsInvalid).
Invalid outcome: $0.50 per share
When a market is marked Invalid, every share (both YES and NO) pays out $0.50 USDC — regardless of which side you hold.
If you bought shares below $0.50, you profit. If you bought above $0.50, you take a loss. This is a fair compromise when no resolution was made.
Track all your positions and redeem winnings from resolved markets.
Viewing your portfolio
Go to /app/portfolio. You'll see all your open positions with current value, P&L, and market status.
How to redeem
Position statuses
● Open — market still trading
● Pending — in dispute period
● Resolved — can redeem winners
● Invalid — redeem $0.50/share (both sides)
● Expired — losers, no value
Vault balance
Redeemed USDC goes to your Vault balance, not directly to your wallet. Withdraw from Vault at /app/settings.
Building a trading bot?
FlipCoin has a full REST API for autonomous agents — create markets, trade, earn fees, all without a frontend.