A privacy layer for prediction markets
The service is listed on Starknet’s official DeFi page as a tool for trading Polymarket markets without publicly linking positions to a user account. OffMarket uses Starknet’s shared privacy pool and zero-knowledge technology to give users funds in a newly created wallet before they trade.
The practical distinction is important. Users still trade in the same Polymarket markets, through the same order book and at the same odds as other participants. Their positions, trades and market activity remain visible onchain. What changes is the connection between those records and the wallet that originally supplied the funds.
That design addresses one of the defining weaknesses of public blockchain markets. A wallet can reveal not only an individual position, but also trading volume, timing, profit and loss, and relationships between accounts. Once an address is linked to a person or organization, earlier and later activity can often be analyzed as part of the same public record.
OffMarket instead routes the initial funding through a privacy pool before sending USDC to a fresh trading wallet. According to The Block’s report on StarkWare’s OffMarket launch, deposits are currently capped at $1,000 in USDC. StarkWare may change that limit as it assesses demand and usage.
The service is non-custodial. Users retain control of their keys in the browser, while signatures can reportedly be used to recover their Polymarket wallets if OffMarket stops operating. That structure is intended to reduce the risk that a service operator could freeze or permanently control customer funds.
OffMarket follows a limited release that began in August, according to The Block. It is not a Polymarket product or formal partnership, although it is part of Polymarket’s verified builder program. The distinction could matter as privacy tools become more common around financial applications. A builder integration may provide technical access and visibility without making the underlying market responsible for the privacy system.
Privacy with visible limits
The system does not make trading anonymous. Transaction sizes and timing can still provide clues to analysts, and withdrawals remain visible. Privacy pools also work best when activity from many users is combined. A small user base can make it easier to infer which deposit corresponds to a later transaction.
The service applies sanctions screening and geographic restrictions, including Polymarket’s ban on users in the United States, The Block reported. Those controls reflect the central tension in blockchain privacy. Traders may want to prevent competitors, employers or online investigators from mapping their activity, while platforms and regulators still expect systems to identify restricted participants and respond to legal obligations.
The technical foundation has also gone through external review. OpenZeppelin’s audit of StarkWare’s privacy pool contracts reported no critical or high severity issues. The audit nevertheless documented trust assumptions involving governance, proving services and an auditor key. Those assumptions do not necessarily invalidate the system, but they show that privacy guarantees depend on more than the core cryptographic design.
StarkWare said it formally verified the STRK20 privacy pool’s protocol logic and open sourced the Lean verification development. The company also noted that OpenZeppelin had separately audited the contract. Formal verification can provide stronger assurance about specified behavior, but it does not remove operational, governance or user interface risks.
A market structure question
The launch arrives as prediction markets gain greater commercial and political importance. The Block reported combined monthly volume of $14.7 billion for Polymarket and its US platform in June, followed by $12.9 billion in July, $8.4 billion in August and $13 billion in September.
At that scale, public wallet data becomes more than a curiosity. Analysts can use it to identify trading patterns, reconstruct strategies and investigate possible insider activity. That transparency can strengthen confidence when participants want to verify market behavior, but it can also discourage legitimate traders who do not want their financial decisions publicly attached to their identities.
Maya Dotan, a StarkWare researcher, argued in a LinkedIn post that public Polymarket records expose traders’ positions, volume and profit and loss data, while describing OffMarket as routing activity through a zero knowledge privacy pool. Her comments support the product’s privacy rationale. No opposing view was provided in the supplied material, so the launch’s regulatory and market surveillance implications remain open questions rather than settled criticisms.
OffMarket therefore points to a broader direction for digital assets. Privacy is moving from a specialized feature of cryptocurrency networks toward a practical layer for trading, payments and financial applications. The commercial challenge will be to offer selective privacy without creating an environment where compliance becomes impossible.
For prediction markets, that balance may determine whether privacy tools become standard infrastructure or remain limited experiments. Traders may gain protection from casual wallet surveillance, while regulators retain some ability to screen users and investigate activity. The unresolved question is how much information must remain visible for markets to preserve trust as their financial and political influence grows.
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Read and checked by admin on 10/15/2026
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