A Polymarket strategy is a repeatable rule for when to buy, sell or stay out, and the ones with any evidence behind them share three features: they start from an estimate of the real chance made before looking at the price, they trade only where the gap beats the spread and fees, and they size positions so that being wrong is survivable. Nimb's part is the reading: chance, move, money, depth, holders and rules for each market, then a ticket that shows the break-even. Nothing here is financial advice or a promise of returns.
What prediction market strategies are there?
| Strategy | Idea | What it needs | Main risk |
|---|---|---|---|
| Fundamental forecasting | Estimate the chance from evidence; trade large gaps | Real expertise, a record of your forecasts | Overconfidence |
| News reaction | Trade quickly on public news | Speed, attention | Bots are faster; false news |
| Fading extremes | Sell long shots thought to be priced too high | Many small trades | Rare events do happen; capital tied up |
| Near-certain outcomes | Buy at 95–99% before resolution | Careful reading of rules | One surprise or dispute erases many gains |
| Market making | Quote both sides, earn spread and rebates | Capital, automation | Adverse selection, inventory |
| Relative value | Trade inconsistent related markets | Watching many markets | Rules differ; gaps close slowly or never |
| Following large holders | Copy whales | A tracker | Buying after the move; hidden hedges; whales |
How do I check whether a trade is worth it?
- Your number first. Write down your estimate before you look at the price.
- Break-even. Compare your estimate with the break-even after fees and spread, not with the mid-price. A 41% Yes in a politics market through Nimb needs a real chance above about 42.1%.
- Depth. Can you get in and out at that price for your size? Spread and depth.
- Rules. Does your view match what the market actually resolves on? How markets resolve.
- Time. A position that ties up money for a year at a small edge may not beat holding cash.
- Size. How much would you lose if wrong, and could you make the same trade again?
Nimb's Before you trade box runs several of these checks for you.
Buy Yes or buy No?
They are the same bet from opposite sides: buying No at 59% is equivalent to selling Yes at 41%. Choose the side whose price is further from your estimate after costs, and remember that fees are symmetric around 50%: a trade at 30% costs the same dollar fee per share as one at 70%. In multi-outcome events, buying No on an outcome you think is overpriced can be cheaper than buying Yes on all the others. Multi-outcome markets.
Is there evidence any of this works?
Some. Older research on betting and prediction markets finds a long-shot bias (low-priced outcomes win less often than their price suggests), though Nimb's 2026 check of Polymarket found the opposite; thin markets react slowly. Both effects are small and costly to trade. Forecasting tournaments show that some people are consistently better than average at estimating chances. There is no evidence that any simple rule beats the market after costs for long. Accuracy research · Polymarket calibration.
Frequently asked questions
What is the best Polymarket strategy?
None works for everyone. The most defensible is to trade only where you have a well-founded estimate that beats the break-even after costs, in small sizes, and to keep a record.
Is buying favourites a good strategy?
Favourites are, on average, slightly underpriced relative to long shots in many studies, but the gains are small and one upset costs many wins.
Should I use a bot?
A bot executes a strategy; it does not create one. Never give a bot your recovery phrase or private key.
Last reviewed 8 November 2026 · Data from Polymarket · Not financial advice · Nimb is not affiliated with Polymarket.