StarkWare has opened OffMarket to the public, giving Polymarket users a way to place prediction-market trades without directly exposing the link between their established accounts and individual positions on Polygon. The tool, which had been available in a limited early release since August, currently limits deposits to $1,000 USDC per account.
OffMarket routes funds through a privacy pool on Starknet before orders are executed on Polymarket. The orders face the same counterparties and receive the same market prices as standard Polymarket orders, according to StarkWare, but the resulting positions are associated with wallets derived from user signatures rather than a user’s visible Polymarket account.
The launch addresses a practical weakness of onchain prediction markets: every trade on Polymarket’s Polygon-based system is publicly visible. Account balances, positions, order sizes and trading histories can be inspected by competitors, data analysts and automated tracking systems. For users making large or politically sensitive positions, that transparency can reveal strategy before a market has resolved.
Public trading records have drawn scrutiny
Polymarket’s public ledger has already made certain high-profile trades easy to follow. In 2024, blockchain analysts linked several accounts to a French trader who placed tens of millions of dollars on Donald Trump winning the U.S. presidential election.
Public transaction records have also fueled scrutiny over potentially informed trading. Bloomberg reported that at least 34,000 trades between August 2025 and June 2026 were flagged as possible insider activity connected to Polymarket. Such flags do not establish misconduct, but the data can be analyzed precisely because the platform’s transactions remain visible onchain.
OffMarket changes the funding trail rather than removing transparency from the markets themselves. Market questions, prices and traded contracts remain public. A user withdrawing USDC from the privacy pool into a newly created wallet would still leave a visible transfer, and subsequent Polymarket activity from that wallet would also be public.
Trade size, timing and patterns of behavior can also provide clues about identity. A large order placed shortly after a visible withdrawal, for example, may be easier to associate with a particular participant than a routine small trade. The service therefore offers separation between a funding source and a trading wallet, rather than complete anonymity.
Starknet pool holds about $1.5 million
OffMarket operates through Starknet’s shared privacy pool, which holds roughly $1.5 million across 17,000 deposits, according to L2BEAT. Shared pools are designed to make it harder to link a specific deposit with a later withdrawal, since users’ funds enter a common set of assets rather than moving directly from one publicly known address to another.
The pool uses zero-knowledge technology, a cryptographic method that can prove a user is entitled to withdraw funds without revealing which specific deposit belongs to them. Users retain control of their keys in their browsers, StarkWare said, while the pool’s smart contracts are open source.
Polymarket positions are held in Polymarket contracts under wallets generated from user signatures. StarkWare said those signatures can be used to recover the wallets if OffMarket ceases operating, reducing dependence on the interface itself for access to positions.
OpenZeppelin audited the privacy-pool contract in June and reported no critical or high-severity findings. The contract was formally verified in July, according to StarkWare.
The service takes roughly one minute to execute private orders and several minutes to process withdrawals. Polymarket’s standard taker fee continues to apply. StarkWare did not publish user numbers or trading volumes from the early-access period.
Compliance controls remain part of the design
OffMarket is not a Polymarket product and does not have a formal partnership or special access to the platform, StarkWare said. It participates in Polymarket’s verified builder program, an integration framework through which Polymarket can disable builder code associated with third-party services.
The product also enforces Polymarket’s geographical restrictions, including its prohibition on U.S. users.
Financial Privacy Inc. holds the master viewing key in a secure enclave and screens deposits against sanctions lists, according to StarkWare. A viewing key can provide transaction visibility for compliance purposes but does not grant access to user funds. StarkWare and Financial Privacy Inc. use a multisignature arrangement to secure that key.
Those controls place OffMarket within a growing effort to offer selective rather than absolute privacy on public networks. Earlier in 2026, Starknet introduced its STRK20 framework, which allows ERC-20 balances and transfers to be shielded while retaining viewing keys for disclosures where required.
On Tuesday, StarkWare introduced another STRK20 feature called Shadow Accounts. The tool is intended to let users interact with individual applications without publicly connecting that activity to their main wallets. Together with OffMarket, it gives Starknet users more ways to separate application-specific activity from their primary onchain identities.
Prediction-market activity remains substantial
The rollout arrives after months of heavy trading in prediction markets. Polymarket and its U.S. platform recorded combined volume of $14.7 billion in June, followed by $12.9 billion in July, $8.4 billion in August and $13 billion in September, according to figures provided by Polymarket.
Across prediction-market contracts more broadly, users traded $4.5 billion during the 30 days ending in mid-October 2026, while open interest stood at $350 million, according to the supplied market data. Higher volumes create more value in transaction large positions can signal sentiment, expose hedging activity or give other traders an opportunity to anticipate a participant’s next move.
Starknet’s own activity has increased alongside interest in privacy tools. Total value locked on the network reached $168 million in early October, while daily active wallets rose above 2,800 during the same period, according to the supplied network data.
OffMarket’s $1,000 cap keeps the public launch focused on smaller deposits for now. That limit also constrains its immediate role for large traders, whose activity is often the most visible and commercially sensitive on public prediction markets. Yet the release shows how privacy infrastructure is moving from a general blockchain concept into a specific trading use case: allowing participants to access open, onchain markets without automatically publishing the full path from wallet funding to final wager.
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