On Nimb, the short version is: you can lose 100% of the amount you put into a Polymarket position. On top of being wrong about the event, you face thin order books, disputed resolutions, wallet and smart-contract risk, legal limits where you live, and the limits of Nimb's own data. Trade only money you can afford to lose.
Can I lose money on Polymarket?
Yes. A share pays $1 if its outcome happens and $0 if not, so if your side loses, the whole amount on that position is gone. A $100 Yes order at 41% returns $0 if the event does not happen. There is no stop-loss that protects you at resolution, and no deposit insurance on the funds in your wallet.
Most traders do not beat the market after fees and spread. A run of wins over a few markets proves little: binary results are noisy, and luck looks like skill for a long time.
What are the main risks, and how do I limit them?
| Risk | Example | How to limit it |
|---|---|---|
| Market risk | You buy Yes at 41%; the event does not happen; you lose your whole stake. | Size each position so a total loss is acceptable. Write your chance down before you trade. |
| Liquidity risk | You want to sell but the best bid is 10 points below the last trade. | Check spread and depth before you buy. Use small amounts on thin books. |
| Resolution risk | The rules count something narrower than the title, or the result is disputed for days. | Read the rules and resolution source. Avoid markets with ambiguous wording. |
| Wallet risk | A phishing site asks you to sign a message that moves your funds. | Keep your recovery phrase offline. Read every signature request. Use a separate wallet for trading. |
| Smart-contract and collateral risk | A bug or exploit in a contract, or trouble with the stablecoin behind pUSD. | Do not keep more in your trading wallet than you are prepared to lose. |
| Legal and location risk | Trading is restricted where you live, or winnings are taxable. | Check eligibility and local law. Never use a VPN to get round a block. |
| Data risk | A correlation or holder signal on Nimb turns out to be noise. | Read Nimb's known limitations. Treat signals as questions, not answers. |
| Behavioural risk | Trading to win back losses, or more often than you planned. | Set a budget in advance. Take breaks. Get help early. |
Why is market risk larger than it looks?
The price is the market's estimate, and it can be wrong in either direction. Two biases matter for retail traders. The long-shot bias: cheap outcomes at 2% to 10% tend to be overpriced, so buying many long shots usually loses money even though each one looks cheap. And fees weigh most on cheap shares, because Polymarket's taker fee as a share of what you spend is highest at low prices. A large × multiple on the ticket is a measure of how unlikely the outcome is, not of how good the trade is.
What is liquidity risk?
Liquidity is how much you can trade near the current price. On a thin book a large order fills at worse prices, and later you may not find a buyer near the price you see. Money in a long-dated market is locked until it resolves unless you sell, possibly at a discount. The spread and order book depth page shows how to measure this before you trade.
What is resolution risk?
Resolution risk is the chance that a market resolves differently from what you expected, or later. Polymarket resolves most markets through the UMA Optimistic Oracle: anyone can propose a result with a bond, and anyone can dispute it within 2 hours. An undisputed result settles in about 2 hours; a disputed one goes to a vote by UMA token holders and takes 4 to 6 days in total. Things that go wrong:
- the rules, not the title, decide the result, and they can be narrower than you assumed;
- Polymarket can add a clarification after trading starts;
- the vote can go against what you believe is the right reading;
- in rare cases a market resolves 50-50, and each share pays $0.50.
Read the rules before every trade. See how markets resolve and UMA's documentation.
What are the wallet and smart-contract risks?
Nimb never holds your funds: you trade from a self-custody wallet, so you alone control it, and you alone can lose it. If someone gets your recovery phrase, or you sign a malicious request, your funds can be taken and nobody can reverse it. Nimb will never ask for your recovery phrase.
Your positions and pUSD sit in smart contracts on Polygon run by Polymarket. pUSD is backed by USDC. Contracts can have bugs, networks can stall, and stablecoins depend on their issuer. These are low-frequency risks with large consequences.
Is Polymarket safe?
Polymarket is non-custodial, its contracts are public and its order book is widely used, but no platform is risk-free, and "safe" depends on how you use it. Nimb is not affiliated with Polymarket and cannot vouch for it. Use money you can afford to lose and protect your wallet.
Where is trading restricted?
Polymarket lists the United States, the United Kingdom, France and about 35 other countries and regions as close-only (you can close positions but not open new ones); sanctioned places are blocked completely. Nimb checks Polymarket's geoblock endpoint before every order and disables opening orders where Polymarket does. Do not use a VPN or any other workaround: it may break your local law and Polymarket's terms. Rules on prediction markets and on taxing winnings differ by country and change; check them where you live. See eligibility and restricted countries.
How far can you trust Nimb's data?
Nimb's analytics have documented limits, and Nimb publishes them. Its own tests (snapshot of 2026-11-07, before fixes) found that 43% to 71% of the "moves with / against" links then flagged were expected false positives, and that only 6 of 28 themes beat a random-basket test. Nimb has since tightened the rules for those links (30-day data only, at least 30 joint observations, |ρ| ≥ 0.5, a leave-one-out test), but correlations on 30 days of data remain fragile. Holders are the top wallets only, not all of them; data can lag; and a wallet's past profit does not predict its next trade. See known limitations.
Any alpha you read into Nimb's data is yours to test, and most apparent edge is noise or fees.
What if trading stops being fun?
Prediction markets can become a form of gambling. Signs to take seriously: trading more than you planned, chasing losses, hiding it, borrowing to trade, or feeling restless when you stop. To keep it healthy:
- set a monthly amount you can lose without harm, and stop when it is gone;
- never trade with borrowed money or money for bills;
- take breaks, and do not trade to change your mood;
- keep a reading log, so you judge yourself on readings, not on wins.
If you are worried, talk to someone early. Free, confidential help exists in most countries, for example a national gambling helpline or Gamblers Anonymous.
Is anything on Nimb financial advice?
No. Nimb shows Polymarket's public data, explains it in plain sentences and lets you send orders from your own wallet. It does not recommend markets, sides or amounts, and nothing on Nimb is financial, legal or tax advice. Every decision, and every loss, is yours. More about how Nimb works on the about page.
Prediction markets are risky; you can lose your whole stake. Not financial advice.
Last reviewed 2026-11-07 · Data from Polymarket · Not financial advice · Nimb is not affiliated with Polymarket.