StarkWare Opens OffMarket To The Public, Letting Polymarket Users Trade Without Publicly Linking Wallets
StarkWare has formally launched OffMarket, a zero-knowledge-based privateness service that permits customers to commerce on Polymarket with out publicly linking their positions to their present wallets. The device, which operates on Starknet, grew to become publicly obtainable after a restricted early launch that started in August.
The service addresses a long-standing concern in prediction markets: Polymarket information all trades publicly on Polygon, making it potential for anybody to look at account positions, order sizes, and buying and selling histories. This transparency has beforehand enabled blockchain analysts to determine high-profile merchants, together with a French bettor who wagered tens of hundreds of thousands of {dollars} on the result of the 2024 U.S. presidential election. More lately, Bloomberg reported detecting at the least 34,000 trades flagged as doubtlessly suspicious between August 2025 and June 2026.
OffMarket routes person funds by way of Starknet’s shared, open-source privateness pool, which presently holds roughly $1.5 million throughout 17,000 deposits, in response to L2BEAT knowledge cited by StarkWare. Trades themselves are executed straight on Polymarket, which means customers work together with the identical counterparties and market costs as everybody else. Deposit limits are set at $1,000 USDC per account for now, with plans to regulate the cap primarily based on demand and utilization.
A Non-Custodial Model With Guardrails
OffMarket operates completely on a non-custodial foundation: customers retain management of their non-public keys of their browsers, funds sit within the audited privateness pool, and Polymarket positions are held in contracts derived from person signatures. If the service ever goes offline, customers can recuperate their wallets independently utilizing these signatures. OpenZeppelin audited the pool contract in June with out figuring out vital or high-severity points, and StarkWare formally verified it the next month.
The launch extends a broader privateness push by Starknet, which launched its STRK20 privateness framework for shielding ERC20 balances in June and unveiled Shadow Accounts this week, a function permitting customers to work together with functions with out linking exercise to their predominant wallets. StarkWare co-founder Eli Ben-Sasson, a founding scientist of Zcash, framed the mission as a continuation of his long-standing work on monetary privateness.
That stated, the privateness supplied shouldn’t be absolute. Markets, costs, and trades stay public on Polymarket, and observers can nonetheless try and determine merchants by way of transaction dimension or timing. Usage of the pool is anticipated to develop to mitigate this.
OffMarket shouldn’t be an official Polymarket product and holds no particular entry to the platform, although it participates within the alternate’s verified builder program, which Polymarket may disable. The service enforces Polymarket’s geographic restrictions, together with the ban on U.S. customers, and routes compliance by way of Financial Privacy Inc., an impartial agency holding the grasp viewing key in a safe enclave below a multisignature association. Deposits are screened in opposition to sanctions lists, and any disclosure of transaction knowledge to courts or regulators requires verified authorized authority.
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