StarkWare launches private Polymarket trading service on Starknet

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StarkWare private Polymarket trading

Highlights

StarkWare launched OffMarket on Starknet, using zero-knowledge tech for private Polymarket trading with a $1,000 USDC per account cap as of August launch.
OpenZeppelin audited the privacy pool in June, finding no critical or high-severity issues, while StarkWare formally verified the contract in July.
Despite enhanced privacy, transaction sizes, timings, and public trades on Polymarket remain visible, with Starknet's privacy pool holding about $1.5 million and 17,000 deposits per L2BEAT.

OffMarket rollout and privacy design

As reported by The Block, StarkWare has launched OffMarket after a limited early release that began in August, using zero-knowledge technology on Starknet to obscure the link between a user's account and Polymarket positions. Deposits are currently capped at $1,000 USDC per account, and a spokesperson says the company plans to adjust that limit based on demand and usage.

Orders are executed on Polymarket itself, against the same counterparties and at the same market prices as other users. StarkWare says the service is fully non-custodial, with users keeping control of their keys in their browsers, while funds sit in Starknet's open-source privacy pool and Polymarket positions are held in contracts under wallets derived from user signatures.

The company says users can recover their wallets from those signatures if OffMarket goes offline. OpenZeppelin audited the pool contract in June and reported no critical or high-severity findings, while StarkWare says it formally verified the contract in the following month.

Limits of privacy for prediction markets

The launch comes as public visibility on Polymarket trading continues to draw attention to user behavior. Because trades are recorded publicly on Polygon, anyone can inspect positions, order sizes and trading histories, and blockchain analysts in 2024 linked several accounts belonging to a French trader who had placed tens of millions of dollars in bets on Donald Trump winning the U.S. presidential election.

More recently, Bloomberg reported identifying at least 34,000 trades flagged as possible insider activity between August 2025 and June 2026. StarkWare's spokesperson says OffMarket still cannot stop someone from inferring a trader's identity through transaction size or timing, since markets, prices and trades remain public.

Transfers of USDC from the shared pool to a fresh wallet are also visible, along with any Polymarket trades from that address, even if the original depositor is not directly shown. StarkWare says the service uses Starknet's existing privacy pool, which holds about $1.5 million and 17,000 deposits, citing L2BEAT figures, while co-founder and CEO Eli Ben-Sasson says the project builds on his long-running work in financial privacy.

Our earlier coverage of anti-scam efforts in the Philippines highlighted how industry groups are urging companies to adopt AI-driven fraud detection and strengthen coordination with regulators as e-wallet usage expands. We also noted rising cross-border fund flows linked to fraud and argued that faster information sharing and automated monitoring are becoming essential to protect users and the integrity of digital payment systems.

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