Polymarket Protocol V2 Begins Canary Tests Before November Switch

The largest crypto prediction market is replacing the plumbing underneath its contracts. Polymarket began running a small number of live markets on Polymarket Protocol V2 this week, a rebuilt smart-contract system designed to replace the Gnosis Conditional Tokens Framework the platform has relied on since 2019. The company plans to keep the new system in a canary phase through October 30 and to start routing newly created markets through it on November 2, a date it describes as tentative.

What happened

Rajath Alex, Polymarket's head of protocol, announced the rollout in a post on X on Monday, October 5, 2026, according to The Block. The new architecture consolidates what had become a stack of separate contracts and adapters into a single ERC-1155 positions contract, one collateral token, one exchange that supports multiple market types, and a router.

At launch, V2 covers four market types: binary, atomic neg-risk, incremental neg-risk and combinatorial. Market resolution moves to a new OracleAggregator that can plug into UMA, Chainlink and other data sources. The Block reported that the protocol also includes provisions for moving positions, collateral and resolutions across blockchains, a feature Polymarket says it will switch on when it expands beyond its current network.

Cointelegraph reported that V2 uses Polymarket USD (pUSD) as its sole collateral token. pUSD was introduced with an exchange upgrade in April 2026 and is backed one-to-one by Circle's USDC. Polymarket currently operates on Polygon, where pUSD is issued, and has not said when cross-chain functionality will launch or which networks it will support. The new contracts are upgradeable through what the company calls a "secure governance process," which reduces the need to deploy new contracts for each feature.

Polymarket said the code was audited by Cantina, Certora, Quantstamp, Sigma Prime, Zellic and Pashov, with Certora also formally verifying it, and it is offering a bug bounty of up to $5 million for critical vulnerabilities. Alongside the protocol, the company is rolling out Data API V2, a Rust service built on its in-house on-chain indexer.

Why it matters

Prediction markets are only as trustworthy as the contracts that hold collateral and the oracles that settle outcomes. Polymarket Protocol V2 touches both. Consolidating positions into one contract and collateral into one token simplifies the system that market makers and developers must integrate with, and the OracleAggregator gives Polymarket more than one route to resolve a market. Disputed resolutions have been among the most contentious issues on the platform, so the ability to draw on multiple oracle sources is likely to be watched closely.

For ordinary users, the change is designed to be mostly invisible. According to Polymarket's Protocol V2 migration guide, existing positions will not be converted, and app and website users do not need to take technical steps, although they may be asked to approve new contracts when trading. The documentation provides separate migration paths for SDK users, direct API integrations and smart-contract integrations, while retaining support for markets on the old framework.

The four market types also matter. In general terms, neg-risk markets link several mutually exclusive outcomes, such as the candidates in an election, so that positions across them can be managed together, while combinatorial markets let traders take positions on combinations of outcomes. Supporting all of them on one exchange is meant to remove the extra adapters that each new product type required under the old framework.

Upgradeable contracts bring a trade-off. They make it easier to fix bugs and add features, but they also concentrate power in whoever controls the upgrade process. The audits and the formal verification address code quality, not governance, so how upgrade rights are held and exercised will matter to large traders.

The timing also fits a period of rapid expansion. The Block reported that Polymarket is in talks to raise $1 billion at a $21 billion post-money valuation, citing Bloomberg, and that the company has been adding senior staff, including Alex, who joined in May. Called It has covered Polymarket's push to add consumer safeguards in its deposit limits and self-exclusion tools, and competitors are building on other chains, as with Decrypt's information exchange on Solana.

What's next

The canary period runs through October 30, with weekly office hours for developers and market makers, according to the migration materials. If testing goes smoothly, net-new markets would move to Polymarket Protocol V2 on November 2, while existing markets continue to settle on the current system. Watch for any incidents during the canary phase, for details on the governance process that controls upgrades, and for an announcement on which blockchains Polymarket will add once its cross-chain features are switched on.