StarkWare Launches OffMarket Allowing Polymarket Users to Trade Privately

StarkWare has officially launched OffMarket, a privacy trading service that allows users to trade on Polymarket without disclosing their positions. The service has been in limited testing since August and operates on Starknet's zero-knowledge technology with a shared privacy pool. Each account has a USDC deposit limit of $1,000, which StarkWare will adjust based on demand. Orders are executed on Polymarket, facing the same buyers and sellers at market prices. OffMarket is completely non-custodial, with users' private keys stored in their browsers, and funds held in Starknet's open-source privacy pool. Polymarket positions are held in contracts by wallets derived from user signatures. OpenZeppelin completed an audit of the privacy pool contracts in June, finding no serious issues, and StarkWare completed formal verification the following month. StarkWare CEO Eli Ben-Sasson stated that the project stems from their long-term investment in financial privacy and emphasized that OffMarket brings zero-knowledge technology to Polymarket. A StarkWare spokesperson noted that OffMarket cannot completely prevent others from identifying traders through transaction size or timing, as the market, prices, and transactions themselves remain public, and transfers of USDC from the shared pool to new wallets can also be observed.

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