StarkWare launches OffMarket to let Polymarket users trade more privately
\n
Public launch after limited test
\n
StarkWare opened OffMarket to all users on October 14, 2026. The service had been in a limited release since August. OffMarket lets users trade on Polymarket without linking their positions to the accounts they normally use.
\n
Key points:
\n
- \n
- Public launch follows August limited release. \n
- Uses Starknet's shared privacy pool (≈$1.5 million across 17,000 deposits, per L2BEAT). \n
- Deposit cap is $1,000 USDC per account; StarkWare will adjust the limit based on demand and usage. \n
- Orders are executed on Polymarket itself, using the same buyers, sellers, and market prices. \n
- Private orders take about a minute; withdrawals take a few minutes; Polymarket's normal taker fee applies. \n
\n
How the privacy pool works
\n
OffMarket uses zero‑knowledge technology on Starknet. Users keep their private keys in their browsers, making the service non‑custodial. Funds are placed in Starknet's open‑source privacy pool, while Polymarket positions are held in its contracts under wallets derived from user signatures.
\n
If OffMarket ever goes offline, users can recover their wallets using those signatures.
\n
Deposit limit and non‑custodial design
\n
Each account may deposit up to $1,000 USDC at a time. StarkWare plans to adjust the limit based on demand and usage, a spokesperson said. Because the service is non‑custodial, users retain full control of their keys; no third party holds their funds.
\n
Audit, verification, and compliance
\n
OpenZeppelin audited the privacy pool contract in June 2026 and reported no critical or high‑severity findings. StarkWare formally verified the contract the following month. Financial Privacy Inc. (FPI) holds the master viewing key in a secure enclave. FPI screens deposits against sanctions lists and can release transaction information only under approved legal requests. The viewing key does not give FPI access to user funds.
\n
What users can hide and what they cannot
\n
OffMarket does not reveal the original depositor of funds in the shared pool. However, USDC transfers from the pool to a fresh wallet are visible, as are the Polymarket trades executed from that address. The service cannot prevent identification through transaction size or timing, and the markets, prices, and trades themselves remain public.
\n
Relationship with Polymarket
\n
OffMarket is not a Polymarket product and has no formal partnership. It is part of Polymarket's verified builder program, though Polymarket can disable the builder code. The platform is aware of the project and says it is "happy" with it. OffMarket applies Polymarket's geographic restrictions, including a ban on U.S. users.
\n
Sources
\n
- \n
- The Block \n
Newisty Editorial Team covers technology, cryptocurrency, digital products, online platforms, developer tools and the wider digital economy. Our content is researched from official sources, company announcements, public documentation, market data and other primary or reputable sources. Articles are reviewed and edited before publication for clarity, accuracy and useful context.