Polymarket is adding Time-Weighted Average Price resolution to its short-duration crypto markets. It is a sensible, overdue fix that the platform’s own users had been requesting for months while watching manipulation drain their accounts.

The TWAP integration applies specifically to 5-minute Bitcoin and crypto up/down contracts, with plans to eventually extend the mechanism to 15-minute markets. Polymarket staff confirmed the update through social media posts in mid-July 2026, roughly five months after the 5-minute contracts launched on February 12, 2026.

A $4 billion market with a $7.6 million problem

The 5-minute crypto contracts were, by any measure, a hit. They accumulated $4 billion in cumulative trading volume, which is a remarkable number for contracts that resolve faster than most people’s coffee orders.

The problem is that single-price snapshots, which is how these contracts previously resolved, are trivially easy to game near expiry. A well-capitalized trader can push a price in the final seconds of a contract, collect the payout, and leave retail participants holding the loss.

Analysis of these markets identified roughly $7.6 million in losses attributable to exactly that kind of exploitation.

The criticism from users was direct: they had flagged the manipulation issue and asked for TWAP-style protections for months before Polymarket publicly acknowledged the problem and committed to a fix.

What TWAP actually does, and why it matters

TWAP, or Time-Weighted Average Price, is not a new concept. Traditional finance has used it for decades as a way to smooth out the effect of short-term price spikes on order execution and settlement.

In English: instead of resolving a contract based on whatever the price happens to be at one specific second, TWAP calculates an average price across a defined window of time. A trader trying to manipulate a TWAP-based resolution would need to sustain an artificial price across that entire window, which is dramatically more expensive and difficult than a single last-second push.

The platform runs on the Polygon blockchain with USDC for settlement and uses a hybrid Central Limit Order Book model for trading. The TWAP mechanism will plug into this existing infrastructure as the resolution layer for short-duration contracts.

The competitive cost of moving slowly

When a platform’s core mechanic, in this case, fair resolution, is visibly broken and the fix takes months to arrive after users have already documented millions in losses, traders start looking elsewhere. Critics have directly linked Polymarket’s delayed response to deteriorating market trust and a loss of market share to competitors who moved faster on user feedback.

A $4 billion cumulative volume on 5-minute contracts launched in February 2026 is not a struggling product. But momentum and trust are separate things, and the manipulation problem was quietly eroding the latter even as the numbers looked impressive on the surface.