Polymarket has started live-testing Protocol V2, a ground-up rewrite of the smart contracts behind its prediction markets, with new markets set to switch over on Nov. 2.

Polymarket’s developer account introduced Protocol V2 on Monday as “a new smart-contract foundation built for prediction markets.” The upgrade, led by head of protocol Rajath Alex, replaces the platform’s legacy 2019 foundation , the Gnosis Conditional Tokens Framework (CTF).

CTF has carried Polymarket’s markets for years, but the goal of the latest rewrite is to eliminate any “architectural bloat.” Smart contract auditor Quantstamp described the result as a single exchange, collateral token, and router that handle every market type.

The design notes shared at the time of launch break the change into a handful of swaps:

Each position ID also encodes its market type, market, and outcome, so the protocol can read what a token is straight from its ID.

For ordinary users, very little, as Polymarket’s migration guide says app and website users need no technical migration beyond approving prompts in the app. Existing CTF holdings will not be converted, and old markets running on the old framework continue to do so until they resolve.

Developers and market makers carry the real workload as they get the canary window from Oct. 5 to Oct. 30 to add V2 support, with new markets tentatively switching on Nov. 2. The contracts have been formally verified by Certora, and Polymarket is offering a bug bounty of up to $5 million for critical flaws.

This is Polymarket’s second big rebuild of the year, as earlier in April, Polymarket moved its order book to CLOB V2 and replaced bridged USDC.e with pUSD, a cutover that wiped every resting order. Protocol V2 goes one layer deeper to the tokens themselves, but it leaves existing positions alone.

Bitcoin.com News reported recently that regulated U.S. prediction markets cleared $68.18 billion in the 30 days to Sept. 29. Kalshi took $50 billion of that, a 73.4% share, while Polymarket U.S. grew 127% to $8.3 billion, a 12.2% share. Kalshi’s grip on combination bets also slipped, from 93.5% to 83.9%, so a native combinatorial module looks like a direct play for that business.

Moreover, it bears mentioning that Polymarket just took the Dutch gambling regulator to court over its ban—a reminder that the platform is fighting on product and policy at the same time.

Polymarket is asking a Dutch court to overturn the Netherlands' ban on its prediction market, arguing it offers financial products…