Polymarket to Upgrade Crypto Up/Down Market Settlements: From Single Price Snapshots to TWAP

Polymarket is preparing a significant change to how its crypto Up/Down markets are settled. Beginning at 00:00 UTC on August 7, affected markets will move away from settlement based on a single price snapshot and instead use a time-weighted average price, commonly known as TWAP.

The change is aimed at improving market integrity in short-duration crypto prediction markets, where even a brief price distortion around the settlement moment can materially affect outcomes. For traders, liquidity providers, and developers building around on-chain prediction markets, this is more than a technical parameter update: it reflects a broader industry shift toward more manipulation-resistant market infrastructure.

What Is Changing?

Under the previous design, a crypto Up/Down market could be resolved using the asset price at one specific moment. While simple, this approach creates a fragile settlement point. If liquidity is thin or price discovery is fragmented across venues, a temporary move around that exact timestamp may have an outsized impact.

Polymarket’s new settlement model replaces that single point with a short averaging window:

In practice, this means the final market result will be based on the average price over a defined period rather than one instantaneous tick. The goal is to reduce the influence of short-lived price spikes, liquidity gaps, or last-second manipulation attempts.

Why TWAP Matters for Prediction Markets

A TWAP mechanism calculates the average price of an asset over a specific time interval. In traditional trading, TWAP is commonly used to reduce market impact when executing large orders. In prediction market settlement, it serves a different but related purpose: making the final result harder to distort.

For crypto assets, this is especially relevant because prices can vary across exchanges, liquidity can shift rapidly, and short-term volatility is often amplified during low-volume periods. A single snapshot can be accurate in normal conditions, but it may become problematic when the settlement moment coincides with temporary market dislocation.

By adopting TWAP, Polymarket is attempting to make its crypto prediction markets more robust in three ways:

1. Reducing settlement manipulation risk
   A trader attempting to influence the outcome would need to affect prices across an entire window, not just one moment.

2. Improving confidence for market participants
   Traders are more likely to participate when they believe settlement rules are resistant to edge-case exploits.

3. Aligning with institutional-grade data practices
   As prediction markets attract more attention, transparent and defensible data methodologies become increasingly important.

For readers unfamiliar with the concept, Chainlink has published materials explaining how data infrastructure can support low-latency pricing and market applications through its Data Streams documentation.

The Timing: Market Integrity Is Becoming a Core Crypto Theme

The update comes as prediction markets are receiving renewed attention from both crypto-native users and mainstream observers. Platforms like Polymarket have shown that event-based markets can become powerful tools for aggregating crowd expectations around elections, macroeconomic events, sports, crypto prices, and regulatory outcomes.

At the same time, prediction markets sit in a sensitive regulatory environment. Polymarket previously reached a settlement with the U.S. Commodity Futures Trading Commission over event-based binary options markets, a reminder that these platforms must balance product innovation with compliance and market safeguards. The CFTC’s public order provides useful background on how regulators have viewed certain event contract structures in the past via the agency’s official enforcement release.

Against that backdrop, the move to TWAP can be read as part of a larger maturation process. Crypto markets in 2025 are no longer judged only by speed, liquidity, or user growth. Increasingly, users care about whether protocols can withstand adversarial behavior, whether data sources are transparent, and whether market outcomes are explainable after the fact.

Liquidity Incentives During the Transition

To support the transition, Polymarket plans to provide $1 million in liquidity rewards throughout August for affected markets.

This is an important detail. Changing settlement rules can alter market-maker behavior, pricing models, and expected risk. Incentives help maintain healthy order books while traders adjust to the new methodology.

For short-duration crypto markets, liquidity is critical. If bid-ask spreads widen too much, users may face worse execution. If depth disappears near settlement, price discovery becomes less reliable. By pairing the TWAP rollout with liquidity rewards, Polymarket is trying to reduce transition friction and keep market activity stable.

Data Infrastructure: Chainlink TWAP Feeds and WebSocket Access

The technical rollout also matters. Chainlink TWAP testnet data streams are already available, while mainnet streams and Polymarket’s real-time data stream service are expected to go live on August 4.

Developers will be able to access TWAP pricing through two primary paths:

• Chainlink Data Streams, which are designed for low-latency market data delivery
• Polymarket’s public WebSocket, which will provide direct access to relevant real-time data

This dual-access approach is useful for builders. Market makers, analytics dashboards, trading tools, and risk engines can integrate TWAP data directly rather than relying only on post-settlement results.

It also reflects a broader trend in crypto infrastructure: the separation of execution, settlement, and data availability. As decentralized applications become more sophisticated, reliable oracle and data stream design becomes a key part of market architecture, not just a backend detail. Chainlink’s broader oracle network is documented through its official developer resources.

What Traders Should Watch After August 7

For users trading crypto Up/Down markets, the rule change may affect both strategy and risk management.

1. Last-second price moves may matter less

Under a snapshot-based model, traders often pay close attention to the exact settlement second. With TWAP, the final window becomes more important than a single tick. This may reduce the value of strategies built around ultra-short-term settlement volatility.

2. Market pricing may become smoother near expiry

If participants believe settlement is harder to manipulate, pricing may become more stable in the final moments. However, short-duration markets will still remain volatile, especially around major crypto news, exchange outages, macro data releases, or sudden liquidity shocks.

3. Developers need to update assumptions

Any bot, dashboard, or risk model built around old settlement logic should be reviewed. A 30-second or 60-second TWAP window may produce different outcomes than a last-traded-price snapshot, particularly during fast moves.

4. Liquidity rewards may attract more competition

The $1 million incentive program could bring additional market makers into affected markets. That may improve spreads, but it may also make naive trading strategies less effective as pricing becomes more efficient.

A Positive Step, but Not a Complete Solution

TWAP is not a cure-all. If the underlying reference markets are severely disrupted, any pricing methodology can still face challenges. The quality of settlement depends on the reliability of the data sources, the design of the averaging window, and the transparency of dispute or fallback procedures.

Still, replacing a single settlement snapshot with TWAP is a meaningful improvement. It raises the cost of manipulation and makes outcomes less dependent on one fragile moment. For a fast-growing sector like crypto prediction markets, that is a practical step toward more resilient market design.

The move also sends a broader signal: prediction markets are evolving from experimental crypto products into infrastructure that may be used by increasingly sophisticated participants. As that happens, settlement quality, oracle design, and transparent data access will become central competitive factors.

Security Reminder for On-Chain Market Participants

Prediction markets and crypto trading tools often require users to interact with wallets, sign transactions, and manage funds across multiple applications. As market infrastructure becomes more advanced, personal key security remains just as important.

For users who participate in on-chain ecosystems where permitted, a hardware wallet such as OneKey can help keep private keys offline while still allowing interaction with Web3 applications. This is especially relevant for active users who manage multiple assets, test new protocols, or connect to market dashboards and trading interfaces.

Polymarket’s TWAP upgrade is ultimately about trust in settlement. For individual users, the parallel priority is trust in custody: understanding what you sign, protecting your recovery phrase, and keeping control of your own keys.