Battles

Demo

About

Battles is a decentralized prediction market for coin vs. coin performance with zero external oracle dependence. Two tokens face off in a fixed-duration battle, and whichever coin achieves a higher percentage price growth takes the pot. Traditional prediction markets rely on off-chain reporters, feeds, or dispute windows. MemeMarket eliminates third-party reliance by measuring performance directly inside each coin's native pool using a custom Uniswap v4 hook. Relative performance is calculated in log-space via tick accumulators, making it mathematically impossible for single-block flash loans or last-minute price spikes to alter the outcome. Participants take positions in an in-contract constant-product odds market. Buying a side shifts odds based on crowd sentiment without altering token prices or touching the underlying assets. Once the timer expires, any user can execute settlement to claim a keeper bounty, and winning predictions redeem their share of the pool. Fully trustless, admin-free, and automated.

How it's made

**Smart Contracts (OracleHook.sol & Arena.sol):** We developed a cardinality-1 accumulator hook in Uniswap v4 to track running sums of tick-times-seconds during afterInitialize and afterSwap events. Since ticks are log-space, the relative performance between two tokens simplifies to basic subtraction, eliminating precision loss or overflow concerns. The Arena contract oversees battle creation, operates an in-contract FPMM odds market for low-overhead trading, and facilitates trustless bounty-rewarded settlements with automated refund paths for scenarios like dead heats, dead oracle pools, and empty corners. The entire suite has undergone thorough verification, successfully passing 11/11 end-to-end tests against a live PoolManager. **Indexing (The Graph):** We implemented a custom Subgraph to map events such as BattleCreated, Staked, Sold, and Settled. For every trade, the mapping retrieves exact `odds()` and `performance()` views directly from the contract within the same block, enabling the generation of real-time performance line charts and live stake reports. **Frontend & App Engine:** The frontend is built with Next.js, SCSS Modules (BEM), and Wagmi/Viem. It employs a hybrid architecture where state and balances are queried directly from the blockchain, while historical charts and activity reports are seamlessly integrated from the indexer.