To read a Polymarket market, check six things in order: the chance, the move, the money, the book, the holders and the rules. On Nimb, the market panel puts all six on one screen, so you can see what the price says about an event and how much to trust it before you trade.
What is market reading?
Market reading is working out what a prediction market's price, flow and holders say about an event, and how much to trust it.
A price on its own is a number. Market reading turns it into a judgement: 41% backed by $2M of trading and a tight book is a different thing from 41% set by one $300 trade a day ago. The six checks below are the order Nimb's panel follows, top to bottom. Each one has its own page if you want the detail. Reading the market this way takes a minute once you know where to look.
| Check | Where on Nimb | Good sign | Warning sign |
|---|---|---|---|
| 1. The chance | Large figure at the top of the panel, plus the one-sentence reading | Price between about 10% and 90%, where it still carries information | Price under 3% or over 97%: little left to learn, and long-shot pricing is unreliable |
| 2. The move | Points change next to the chance; price chart; first line of "Before you trade" | Steady drift, or a jump you can match to news | "Unusual" flag (24-hour move of 2× a typical day or more) with no news you can find |
| 3. The money | Volume rows at the foot of the panel; money flow chart and table | Volume in the tens of thousands of dollars or more; flow and price pointing the same way | Large move on little volume; flow that comes in one or two hourly bars |
| 4. The book | "Liquidity in the book"; second line of "Before you trade" | $5k or more of liquidity; a spread of 1–2 points | "Thin order book" flag (under $5k); a spread of 4 points or more |
| 5. The holders | "Who is positioned": Yes/No split and the top holders | Value spread over many wallets on both sides | "One wallet holds 40% of the top holders' value" |
| 6. The rules | Resolution date in the panel header; full rules on Polymarket ("See this market on Polymarket") | A clear, named resolution source and a date you understand | Vague wording, an "Other" outcome, or a deadline that has passed with the result pending |
1. The chance: what should I look at first on a Polymarket market?
Look at the price first. A Yes share pays $1 if the event happens and $0 if it does not, so a price of 41 cents is the market's 41% implied probability. Polymarket odds explained covers the conversion in full.
Nimb shows the chance as a whole percentage, with the change in points over the timeframe you chose (1H to 30D; 7D by default) beside it. Under both sits the reading. Nimb's reading of a market is its one-sentence summary: "Traders see a 41% chance…, down 4 points this week." It comes in three shapes:
| Market type | Sentence pattern on Nimb |
|---|---|
| Single Yes/No market | "The market puts this at 41%, down 4.0 points over the past week." |
| List of candidates or options | "Traders give “Candidate A” a 41% chance, down 4.0 points over the past week." |
| "By date" ladder | "Traders see a 41% chance that it happens by Dec 31, down 4.0 points over the past week." |
Two cautions. First, the price is the mid price between the best bid and ask, not the price you pay; you buy at the ask. Second, prices near the ends are the least reliable part of the scale. Research on betting and prediction markets has long found a long-shot bias, where events priced at a few percent happen less often than the price implies. See are prediction markets accurate for the evidence.
2. The move: how do I tell a real move from noise?
Compare the move with the market's own normal day. Nimb does this for you: the first line of the "Before you trade" box takes the last 24-hour change and divides it by the standard deviation of daily changes over the past 30 days. At 2× or more, the line is highlighted:
Moved +6.0 points in 24 hours, 2.4× a typical day. Unusual moves often follow news: check what happened before you follow it.
Below 2×, it says the move is "within a normal day for this market", and a change under 1 point reads "Flat over the last 24 hours."
Then look at the shape on the price chart. A vertical step usually means news arrived and the market repriced in minutes. A slow slope over days means opinion shifted gradually. A line that stays flat for hours often means nobody traded; Nimb carries the last known price forward until the next one, so flat is not the same as stable. A move on almost no volume is the weakest kind: one small order can push a quiet market several points.
3. The money: how much money is behind the price?
Two numbers answer this. Volume is the dollar value of shares traded over the timeframe; Nimb shows Polymarket's own total for 24H, 7D and 30D. Money flow shows which side that money pushed: dollars of Yes bought minus dollars of No bought, per hour, by traders who crossed the spread. The panel puts it in one sentence:
$1.2M traded over the past week. Traders who crossed the spread bought $333k more No than Yes.
A rough scale for a single outcome:
| Volume over 7 days | What it usually means |
|---|---|
| Under $10k | Few traders. A single order can move the price; treat it as a rough guess. |
| $10k–$100k | Active, but one wallet can still dominate. Check the holders. |
| $100k–$1M | Well traded. Moves usually reflect many orders. |
| Over $1M | Among the most traded markets on Polymarket. The price has been tested by a lot of money. |
These bands are a rule of thumb, not a Nimb threshold. The detail is on volume and open interest and money flow.
4. The book: can my order fill near the price?
The order book is the list of open buy and sell orders. Two things matter: the spread (the gap between best bid and best ask) and depth (how much money sits near the price). Nimb shows Polymarket's "Liquidity in the book" figure and turns it into a sentence:
| Liquidity | Nimb's line |
|---|---|
| Under $5,000 | "Thin order book ($3.2k). A large order will get a worse price than 41%; use a small amount or a limit price." (highlighted) |
| $5,000 or more | "About $48k sits in the order book, so orders up to around $4.8k should fill close to 41%." |
A market only appears on the map if its leading outcome has a spread of 4 points or less, or at least $10k of depth. That gate keeps the worst books off the map, but it does not make every book deep. Spread and order book depth works through what a spread costs you.
5. The holders: who holds the biggest positions?
"Who is positioned" shows the largest public holders of the market: a bar splitting their value between Yes and No, then the wallets themselves with side, value and unrealised profit or loss. Wallets that hold both Yes and No in the same market are netted, because a matched Yes+No set is locked at $1 and is not a view on the outcome. Wallets that look like market makers carry an "mm" tag.
Concentration is the warning. If one wallet holds more than 35% of the top holders' value, Nimb adds a highlighted line: "One wallet holds 52% of the top holders' value. A single big seller could move this market." A large holder is a fact about positions, not proof of skill or inside knowledge. See holders and wallet lines.
6. The rules: what makes a market risky to trade?
Every market resolves on written rules: what counts as Yes, by when, and according to which source. Two markets with the same headline can resolve differently because of one clause. Nimb shows the end date in the panel header and a deadline line in "Before you trade":
- "Resolves in 5 days. Money in this market is locked until then unless you sell." (highlighted when 7 days or fewer)
- "Resolves today."
- "The deadline has passed; the market is waiting for the official result."
Nimb does not reproduce the full rules. Open "See this market on Polymarket" and read them before you trade. How markets resolve explains the oracle, disputes and what happens when wording is unclear.
For market reading, what makes a market risky, in short: an extreme price, a thin book, a dominant holder, rules you have not read, and a deadline close enough that one piece of news settles it. Several of these at once is a reason to trade small or not at all.
What does a full reading look like?
Take an illustrative single Yes/No market. The figures are invented to show the method; they are not a live market.
| Check | What the panel shows | What it says |
|---|---|---|
| Chance | 41%, −4.0 points · 7D. "The market puts this at 41%, down 4.0 points over the past week." | Undecided, leaning No. In the range where the price carries information. |
| Move | "Moved −3.1 points in 24 hours, 2.6× a typical day." | Most of the week's fall came in the last day, faster than usual. Look for the news. |
| Money | $1.2M traded over 7D. "Traders who crossed the spread bought $333k more No than Yes." | The fall is backed by money, not one stray order. Flow and price agree. |
| Book | Liquidity $48k. Not flagged. | Orders up to about $4.8k should fill near 41%. |
| Holders | Top holders: 61% of value on No. Largest wallet 18%. | Big positions lean No, but no single wallet dominates. |
| Rules | "Resolves in 24 days." | Time for more news. Read the resolution source on Polymarket. |
Put together, the market reading is this: a well-traded market moved 4 points towards No this week, mostly in one unusually fast day, with No buying behind it and a book deep enough for a retail order. That is the reading. Whether 41% is too high or too low is still your call, and the market has already priced what it knows.
The last line of "Before you trade" makes that explicit. For this market it would read: "Buying Yes at 41% only pays off if the real chance is above 42.2% (fees included). Ask yourself whether you know something the market does not." If you have information the price does not reflect, that is what Nimb's docs call alpha. Most apparent edge turns out to be noise or fees.
What can a reading not tell you?
- The future. A 41% chance means No happens more often than Yes in markets priced like this one, not that it will.
- Why the price moved. Nimb shows that money moved and how fast; you have to find the news.
- Who the wallets are. Holders are pseudonymous addresses. One person can use many wallets, and a large wallet can be a hedge against a position elsewhere.
- Everything in real time. Prices stream live, volumes refresh every minute, and holders and history come from snapshots that refresh every few hours. See data sources and freshness.
- Whether the rules will be applied as you expect. Disputes happen.
Prediction markets are risky: you can lose your whole stake. Nothing in Nimb's docs or panel is financial advice. Read the risks of prediction markets before you trade, and check whether trading is allowed where you live.
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 ticket sits at the foot of the same panel, and the Before you trade checks sit directly above it. Read and execute walks through the full workflow, or browse all markets on Nimb to practise a reading.
Last reviewed 2026-11-07 · Data from Polymarket · Not financial advice · Nimb is not affiliated with Polymarket.