How to Scalp on Polymarket

What is scalping?

Scalping is a high-frequency trading strategy in which a trader executes a large number of trades throughout the day, often ranging from dozens to hundreds, while holding each position for only a few seconds or minutes. The goal is to capture small profits from short-term price movements.

However, scalping on prediction markets differs significantly from traditional scalping for several reasons:

• In prediction markets, prices represent the probability of an event occurring. For example, a price of 0.65 implies roughly a 65% probability.
• Profits are often generated from temporary inefficiencies in probability pricing, delayed market reactions to new information, and short-term volatility.
• Informational advantages tend to be more important than in traditional financial markets.
• Prices are naturally bounded between 0 and 1 (or 0% and 100%), which creates unique trading dynamics.
• Prediction markets are generally much less liquid than major stock or cryptocurrency markets.
• Every contract has a resolution date, meaning prices gradually converge toward the true outcome as the event approaches.

These characteristics create additional trading opportunities and strategies that are not typically available in traditional scalping environments.

The topic of scalping in prediction markets remains largely unexplored. Very few traders openly discuss this strategy, so everything described below is based on personal experience and observations.

How to Identify Scalping Opportunities

Finding the right market is probably the most important part of scalping prediction markets. In my experience, there are two main types of opportunities that work particularly well.

1. Markets That Are Far From Resolution

Some markets are already heavily leaning toward one outcome but still have a long time before they resolve. These are often markets with questions such as:

"Will X happen by December 31, 2026?"

Even when the outcome appears highly likely, traders may still need to wait months before the market officially resolves. Because of this uncertainty, the market continues to price in the possibility that something could change.

If no major developments occur, the price will often gradually drift toward the more likely outcome over time.

One way to take advantage of this is to buy the high-probability side and immediately place a sell order slightly above your entry price. As the market slowly moves in your favor, your position may eventually be filled, allowing you to capture a small profit, often a few percent.

A typical chart for this type of market looks something like this:

Drawbacks of This Strategy

• The market can suddenly reverse due to unexpected news or events.
• Positions may take a long time to exit, making this approach less similar to traditional scalping, where speed and rapid turnover are the primary objectives.

2. High-Activity Markets

By high-activity markets, I mean markets that attract significant trading volume and strong trader participation.

Unlike the long-term markets discussed above, these markets typically do not have an obvious outcome. As a result, traders actively buy and sell both sides of the market, creating frequent trading opportunities and strong liquidity.

This environment makes it much easier to enter and exit positions quickly, which is exactly what scalpers are looking for.

The most difficult part of this strategy is identifying the right market at the right time.

In practice, the best opportunities are often found in highly discussed geopolitical events and major sporting events.

It is extremely important to understand the specific risks of these markets.

In high-activity markets, a single piece of news can instantly send the price toward either 0 or 1, depending on how it affects the perceived probability of the outcome.

Because of this, you should only keep resting buy orders on what you consider the safer side of the market.

For example:

US x Iran permanent peace deal by June 30?

In this market, I would only trade from the YES side.

If you place a buy order on NO and a major headline suddenly suggests that a permanent peace deal is likely to happen, the price of YES could surge almost instantly. Your NO buy order may get filled just as the market moves sharply against you, leaving you with an immediate loss.

When scalping news-sensitive markets, understanding which side carries the greater headline risk is often just as important as finding a good entry price.

How do you find markets for scalping?

You can manually search for opportunities through the Polymarket interface by looking for markets that match the criteria discussed above.

However, this process can be time-consuming and inefficient, especially when hundreds of active markets are available at any given time.

To solve this problem, the PolyScalping team developed MarketScanner, a tool that allows traders to quickly identify markets based on specific criteria.

The process is simple: open MarketScanner, apply the filters that match your strategy, and review the resulting opportunities.

Below is an example configuration for finding Markets That Are Far From Resolution:

Example configuration for finding High-Activity Markets:

If you don't want to configure filters manually, you can use the built-in Scalping preset. It automatically applies a configuration optimized for finding liquid, active markets suitable for scalping strategies.

In the future, our team plans to develop a product that will display scalping opportunities in real time.

When NOT to scalp

Scalping works best when price movements are relatively predictable and you can manage inventory risk. Avoid markets where a single fill can quickly turn into a large directional position.

These are the kinds of markets:

• Markets with very low liquidity
• Markets that are about to resolve
• Markets you do not understand

Avoid placing large resting orders immediately before known events such as election results, economic releases, earnings announcements, court decisions, or major geopolitical statements. Market probabilities can reprice within seconds, leaving little time to react.

FAQ

Can I scalp without LP Rewards?

Yes. LP Rewards are optional and simply increase profitability.

What is the biggest risk when scalping?

Getting filled on only one side of the trade.

Which markets are best for scalping?

Highly liquid sports, politics, and geopolitics markets.

Can I scalp with market orders?

Technically yes, but it is usually not recommended. Scalping relies on capturing small price inefficiencies. Paying taker fees on every trade can quickly eliminate most of your expected profit.

How much liquidity is enough?

There is no universal number. In general, the larger your position size, the more liquidity you need. If entering and exiting your position would noticeably move the market, the market is probably too small for your strategy.

Can I scalp markets trading above 90¢ or below 10¢?

Yes, but opportunities become less frequent. Near the extremes, prices tend to move more slowly and order flow is often less balanced than around the middle of the probability curve.