On Nimb, a first order takes about 5 minutes: read the market, choose Yes or No, type one all-in amount in dollars, check what you receive if you are right and the break-even chance, then sign in your wallet. At 41%, $100 buys about 237 Yes shares after fees in a typical fee-charging market, which pay $237 if it happens. Start with $1–$10.
You need a connected, funded wallet in an eligible country; if not, start at getting started. Prediction markets are risky: you can lose your whole stake. Nothing here is financial advice; read the risks first.
What should you read before your first order?
Open a market from the map or the markets list. The top of the panel holds the reading: Nimb's one-sentence summary, such as "Traders see a 41% chance…, down 4 points this week." Below it are the price chart, the spread and depth, money flow and the largest holders. How to read a market explains each part.
Then look at the Before you trade checks. They flag what most often turns a reasonable view into a poor trade: a wide spread, a thin book, a price near 0% or 100%, a resolution date close by, or concentrated holders. A check is not a verdict; it is a reason to slow down.
How do you buy Yes or No on a market?
A share pays $1 if its outcome happens and $0 if it does not. A Yes share at 41% costs about $0.41; a No share on the same market costs about $0.59. Buy Yes if you think the real chance is higher than the price, No if you think it is lower.
The ticket's toggle shows both sides with live prices from Polymarket's order book. Choose one. In a market with several outcomes (who wins an election, which month something happens), first choose the outcome, then Yes or No on it.
How much should you type?
Type one amount in dollars, or tap the quick amounts: +$10, +$50, +$100, +$500, which add to what is there, and Max, which uses your balance. The all-in amount is the total you spend, fees included: fees are folded into the number of shares, never added on top. If you type $100, $100 leaves your balance.
Ticket orders fill against the best offers in the book at the moment you sign. If the book is thin, a large order walks up through worse prices, so the average you pay can be higher than the price shown. This is slippage. The all-in spend is a target: the amount that fills can differ by a few cents from what you typed.
What is the minimum order?
$1. Below that, the button reads Minimum is $1 and the ticket shows "The minimum order is $1."
What do you receive, and what is break-even?
How many shares does $100 buy?
Take an illustrative Yes price of 41% and $100 all-in. Without fees, $100 ÷ $0.41 = 243.9 shares. With fees folded in, each share costs a little more, so you get fewer:
| Case | Shares | Paid if right | Profit if right | Break-even |
|---|---|---|---|---|
| No fees (for comparison) | 243.9 | $243.90 | $143.90 | 41.0% |
| Fee-charging market, all fees included | 237.1 | $237.12 | $137.12 | 42.2% |
The fee-charging row includes Polymarket's taker fee for an illustrative market in a 0.04-rate category and Nimb's small builder fee, included in the price you see. Together they raise the cost of each share above $0.41, so $100 buys 237.1 shares instead of 243.9. Each pays $1 if it happens: $237.12. Rates differ by category; fees and all-in pricing has the full schedule.
What do you receive if you are right?
The "If right" card shows the payout, the multiple and the profit: for the fee-charging row, $237.12, ×2.4, profit $137.12. The ticket sentence reads: "You buy 237 Yes shares at 41% each. If it happens, you get $237.12. Otherwise you lose $100.00. Break-even 42.2% with fees." (The sentence rounds shares to whole numbers.) If it does not happen, the shares pay $0 and you lose the full $100.
What is break-even and why does it matter?
The break-even probability is the real chance an outcome must have for a trade to pay off on average, fees included. Before you trade, Nimb shows it in a plain sentence. For the fee-charging row: "Buying Yes at 41% only pays off if the real chance is above 42.2% (fees included)." If you cannot say why the chance is above that number, the price may already reflect what you know.
What does the button say at each step?
The main button always names the next step:
- Connect wallet: no wallet yet. Pressing it opens the connect panel.
- Enter an amount: connected, no amount.
- Minimum is $1: amount below $1.
- Not enough balance: amount above your pUSD balance. Add funds.
- Buy Yes · $100: ready. Pressing it sends the order to your wallet.
- Confirm in your wallet: check the pop-up and sign. Signing an order costs no gas.
- Placing your order: the signed order is on its way to Polymarket's order book with Nimb's builder code.
- Try again: the order did not go through (rejected signature, price moved, network error). Nothing was spent.
Before every order, Nimb checks Polymarket's geoblock from your browser. In a restricted or close-only location, buying is off. See restricted countries.
Where does the order go after you sign?
Your shares appear in your portfolio with entry price, current mark and unrealised P&L. They also appear in Polymarket's public holder data for that market, because positions on Polygon are public.
How do you sell before the market resolves?
You do not have to wait for resolution. Open the market, choose to sell, and the ticket shows what you would receive at the current bid, after fees. Selling also pays the taker fee and the builder fee, and in a thin book the bid can sit well below the mid price. See selling and closing a position. If you hold to the end and you are right, each share is redeemable for $1 in pUSD.
Why start small?
A first order of $1–$10 teaches the ticket, the signature and the portfolio for the price of a coffee. It also shows you slippage in practice: thin books move price, and a $500 order can fill at a visibly worse average than a $5 one. Raise the amount only once you have read the spread and depth.
From reading to execution
Read and execute is Nimb's workflow: read the market in the analysis panel, then act on it in the order ticket, in one place. The order is the last step, not the first; most of the value is in the reading. The order ticket page explains every field in detail.
Last reviewed 2026-11-07 · Data from Polymarket · Not financial advice · Nimb is not affiliated with Polymarket.