Polymarket rolls out Protocol V2 smart contract overhaul

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Polymarket rolls out Protocol V2 smart contract overhaul

Polymarket began rolling out its Protocol V2 smart contract system on Monday, October 5, 2026, according to Cointelegraph. The prediction market platform is testing the new infrastructure on a limited number of live markets through October 30, with a tentative target of November 2 for switching new markets over to V2. Rajath Alex, Polymarket’s head of protocol, announced the rollout in an X post.

Key facts

• Polymarket began Protocol V2 testing on Monday, October 5, 2026, with live-market trials running through October 30 and a tentative November 2 target for new markets to switch to V2, per Cointelegraph.
• The overhaul replaces infrastructure based on code developed in 2019 that required additional contracts and adapters to support new market types.
• Protocol V2 uses Polymarket USD (pUSD) as its sole collateral token, alongside a single contract for position tokens and one exchange supporting different market types.
• Audits were conducted by blockchain security firms including Cantina, Quantstamp, Zellic, SigmaPrime, Pashov and Certora, with formal verification by Certora, according to PANews; Cointelegraph names Cantina, Quantstamp and Zellic plus Certora’s formal verification.
• Polymarket is offering bug bounty rewards of up to $5 million for critical vulnerabilities, Cointelegraph reported.

A modular rebuild of the 2019 stack

Polymarket’s existing system was built on Gnosis’s Conditional Tokens Framework from 2019, according to PANews. As market types and features multiplied, adapters and additional contracts had to be layered on top, driving up system complexity. Protocol V2 addresses that by adopting a modular architecture with a uniform set of components: ERC-1155 position tokens, pUSD collateral, and exchanges and routers matched to each market type.

The architecture supports Binary, Atomic Neg-risk, Incremental Neg-risk, and Combinatorial market types. Polymarket USD was introduced as part of an exchange upgrade in April 2026 and is backed 1:1 by Circle’s dollar-pegged USDC, which is issued on Polygon. Polymarket currently operates its prediction markets on Polygon, an Ethereum scaling network, and pUSD is issued there as well.

Protocol V2 also introduces upgradeable smart contracts, allowing Polymarket to modify contracts through what the company describes as a secure governance process, reducing the need to deploy extra contracts for new features. The OracleAggregator connects to different oracles, including UMA and Chainlink, to determine market outcomes.

Cross-chain support is part of the design: the new protocol is intended to transfer positions, collateral and market outcome data between blockchains. Polymarket has not announced when cross-chain functionality will launch or which networks it will support. Bitcoin World contacted Polymarket for details on the planned blockchains and timing, while PANews framed the cross-chain element as support for future multi-chain expansion.

What happens to existing positions

According to the Protocol V2 migration guide, existing positions will not be converted to V2. Users on the app and website will not need to take technical steps to migrate, though they may be asked to approve new contracts when trading. Polymarket also launched a Data API V2 to support the new protocol and on-chain data indexing, PANews reported.

On the security side, Cointelegraph and PANews list overlapping but not identical audit rosters. Cointelegraph names Cantina, Quantstamp and Zellic. PANews lists Cantina, Certora, Quantstamp, SigmaPrime, Zellic and Pashov, and separately states the code passed formal verification by Certora, which Cointelegraph also cites.

Why it matters

The change affects every trader and developer on Polymarket, though not immediately for anyone holding open positions. Because V2 relies on a single exchange supporting multiple market types, adding new markets no longer requires the layered adapter contracts that made the 2019-era system increasingly complicated. For users, the practical friction is limited to approving new contracts when trading, while builders gain a standardised base (ERC-1155 position tokens, pUSD collateral, oracle aggregation) to design against. The cross-chain design also sets up expansion beyond Polygon, the network Polymarket has relied on, though no timeline has been given.

What to watch

The near-term milestone is the end of the testing window on October 30 and whether Polymarket hits its tentative November 2 target for moving new markets to V2. Users should also watch for any announcements on cross-chain support and the specific networks Polymarket plans to serve.

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