StarkWare supports Polymarket users in placing anonymous orders, and has newly launched OffMarket.

StarkWare has opened OffMarket to the public, allowing users to trade on Polymarket without publicly linking their positions to existing accounts. The service has been in limited beta testing since August, leveraging zero-knowledge technology and sharing a privacy pool on Starknet. Current per-account deposit limits are set at 1,000 USDC, with adjustments planned based on demand. Prediction orders still execute on Polymarket with the same counterparties and at identical market prices. The service is non-custodial, with user keys remaining stored locally in users’ browsers. Additionally, Polymarket transaction records are public on Polygon, with positions, order sizes, and trading history all viewable. OffMarket still does not fully prevent others from inferring a trader’s identity through trade size or timing, as market quotes and executions themselves remain public. This product is not an official Polymarket offering, has no formal partnership or special access privileges, and is part of Polymarket’s Verified Builder Program, retaining its geographic restrictions including a ban on U.S. users. Independent compliance firm Financial Privacy Inc. holds the master viewing key for sanction screening and required disclosures under lawful requests. L2BEAT data shows that the shared privacy pool on Starknet currently holds approximately $1.5 million in total value across 17,000 deposits.