StarkZuri V2: Account Abstraction & Zero-Gas Prediction Markets on Starknet Mainnet

In StarkZuri V1, users still had to manage small balances of ETH or STRK for state verification. While Starknet L2 gas is pennies, any non-zero requirement creates a barrier to entry. For V2, we re-architected our smart contracts to support SNIP-9 meta-transactions.

Instead of sending an invoke transaction directly from the user's account contract, the client signs a typed off-chain commitment. Our relayer verifies the signature, appends an AVNU paymaster token, and executes the call bundle via a single multicall batch.

#[starknet::interface]
pub trait IPredictionMarket<TContractState> {
    fn execute_sponsored_position(
        ref self: TContractState,
        market_id: u64,
        outcome_idx: u8,
        stake_amount: u256,
        user_signature: Array<felt252>
    ) -> bool;
}

Rewriting our matching engine in Cairo 2.x allowed us to optimize step counts and data packing. Order states and pool liquidity shares are packed into tightly bounded bit ranges, reducing storage writes by 42%.

This efficiency translates directly to lower relayer overhead, making continuous zero-gas sponsorship sustainable across thousands of active concurrent participants.

With V2 live on Starknet Mainnet, we are expanding resolution feeds to support decentralized oracle consensus, alongside cross-community reputation badges for top predictive analysts.