Market.sol

The core prediction market contract. Each instance represents a single UP/DOWN prediction on BTC/USD price.

Key Functions

initialize()

Called once by the factory after cloning. Sets up the market parameters.

function initialize(
    address _pyth,
    bytes32 _priceId,
    uint256 _duration,
    address _factory,
    address _feeCollector,
    bytes[] calldata pythUpdateData
) external payable

• Fetches the current Pyth price as the strike price

• Sets tradingEnd = now + duration/2

• Sets expiryTime = now + duration

bet(Side side)

Place a bet on UP or DOWN.

function bet(Side side) external payable whenNotPaused nonReentrant

• Minimum bet: 0.001 BNB

• Must be called before tradingEnd

• Early bets receive bonus shares (up to 2x multiplier at market open)

• Emits BetPlaced event

resolve(bytes[] pythUpdateData)

Resolve the market using Pyth price data.

function resolve(bytes[] calldata pythUpdateData) external payable nonReentrant

• Can be called by anyone after expiryTime

• Verifies Pyth price data on-chain

• Determines winning side (UP if price > strike, DOWN if price < strike)

• Cancels if: one-sided market, exact tie, or empty pool

• Deducts 3% protocol fee from winning pool

claim()

Claim your winnings from a resolved market.

function claim() external nonReentrant

• Only callable after market is Resolved

• Payout = (your shares / total winning shares) × (total pool - fee)

• Can only claim once

refund()

Get your money back from a cancelled market.

function refund() external nonReentrant

• Only callable after market is Cancelled

• Returns exact amount bet (no fees)

Constants

Constant	Value	Description
MIN_BET	0.001 BNB	Minimum bet size
PROTOCOL_FEE_BPS	300 (3%)	Fee on winning pool
RESOLUTION_DEADLINE	24 hours	Auto-cancel if unresolved
PRICE_MAX_AGE	60 seconds	Max staleness for Pyth price
MAX_MULTIPLIER	2x	Early bird share multiplier

Events

Event	When
BetPlaced(user, side, amount, shares)	Bet successfully placed
MarketResolved(winningSide, price, resolver)	Market resolved
MarketCancelled(reason)	Market cancelled
Claimed(user, payout)	Winnings claimed
Refunded(user, amount)	Bet refunded

Inheritance

• ReentrancyGuard (OpenZeppelin) — prevents reentrancy attacks

• Pausable (OpenZeppelin) — emergency pause capability