How to Find the Sharp Money on a Polymarket Game, Step by Step

At a sportsbook, sharp money is a guess. The line moved against the ticket count, so somebody the book respects must have bet the other way. On Polymarket it is a fact. Every buy is a wallet, every wallet's settled positions are public, and 0xinsider grades each wallet from S to F on how often it won against the prices it paid. The profitable wallets, graded S, A or B, are the sharp money. The D and F wallets are the other thing.

The grade carries information about the next bet. Across 155,832 Polymarket sports buys of $1,000 or more from June to September 2026, S, A and B wallets beat the price they paid by 1.25 points and D and F wallets lost 1.21 to it. Almost all of that gap opened after kickoff: in-play, the graded cohort came in at plus 1.95 points and the poorly graded one at minus 2.56. Before kickoff the two were within a point of each other. The study is at 0xinsider.com/research/sharp-money-polymarket-sports, and it shapes every step below: a sharp read before the game confirms the price, and a sharp read during the game moves it.

This guide is about finding that read for one game. It uses the free surfaces where they exist and says where Pro adds detail. Nothing in it is a pick. The signals are inputs to your own probability, and the guide at 0xinsider.com/learn/sports-betting-analytics-guide covers how to turn a probability into a bet.

Open 0xinsider.com/sports and pick the league: 0xinsider.com/sports/nfl, 0xinsider.com/sports/nba, 0xinsider.com/sports/mlb, 0xinsider.com/sports/nhl, 0xinsider.com/sports/soccer, 0xinsider.com/sports/tennis, 0xinsider.com/sports/ufc, 0xinsider.com/sports/esports and the rest. Each board lists the day's games with the Polymarket moneyline, spread and total for each, the kickoff countdown, and the live score once the game starts.

The prices are in cents, and a price is a probability. A team at 62¢ is a 62% chance in the market's view, and buying it pays $1 a share if it wins. There is no line to convert and no vig to back out; the spread between bid and ask on these markets is one cent at the median, and the sports taker fee at 50¢ is 2.5% of the stake, falling to 0.5% at 90¢. The guide at 0xinsider.com/learn/polymarket-fees-explained has the schedule.

Before you read anything else, write down the probability you believe. The rest of this guide is about checking it against the people who have been right before, and that check only works if you have a number to check.

Under each game on a board is a block labelled Profitable wallets. It draws two bars for each side of the game. Smart is that side's share of the profitable wallets' money on the game. Market is the chance the side's price implies. A Smart bar longer than its Market bar means the profitable wallets back that side more than the price does. Bars of about the same length mean they agree with the market. A verdict line above the bars names the side when the money leans one way, or says the sharp money is split.

Read the bars for what they are worth at that moment. Before kickoff, a well-graded consensus is mostly already in the price. The fade study at 0xinsider.com/research/fading-the-crowd-polymarket-sports looked at 1,060 games where 90% or more of the S, A and B money sat on one side before kickoff: that side was priced at 70.3¢ and won 70.0%. So a long Smart bar before the game tells you the price is probably right, and a Smart bar that agrees with your own number is company, not a discount.

During the game the bars are a different instrument. The graded wallets place half their sports buys in-play and that is where their edge lives, so a Smart bar that moves toward one side after kickoff, while the price is still catching up, is the signal the sharp money study measured. Pro shows the wallets behind the bar: every profitable wallet's side, dollar size and win rate on the game, updated live. The free view shows the bars and the verdict.

Click the game to open its event page. The header carries the same Smart and Market bars and the trader column beside them. The rail on the right has two tabs: Polymarket activity, which is the game's trade feed, and Top holders, which lists the wallets holding each outcome with the grade each has earned. Switch the outcome to see the other side. Pro extends the list to a hundred holders and adds a Smart score only toggle that hides everyone below the profitable cohort.

The holders list is where the second cohort becomes visible. The fade study found that when 90% or more of the D and F wallets' pre-kickoff money sat on one side of a game, across 844 games, that side was priced at 67.3¢ and won 63.6%: 3.68 points short of its price, with an interval that clears zero. A flat stake against that side returned 16.4% before fees. When the D and F money was split, there was nothing to fade.

So read the two columns together. A Top holders list with S, A and B wallets on one side and D and F wallets on the other is the study's disagreement case, 774 games, where the graded side came in at plus 0.88 points and the crowd side at minus 1.92. A list where both cohorts are on the same favorite is the agreement case, where the favorite lost about two points to a 69¢ price. A list with only D and F wallets, all on one side, is the fade. The guide at 0xinsider.com/learn/betting-against-the-public-explained covers that habit in full.

The feed at 0xinsider.com/whale-alerts is every large Polymarket trade as it fills: size, side, price, the market, and the grade the buyer has earned. Filter it to the sport or the game. Before kickoff it shows you the money the timing study calls late, which is most of it: 22.8% of large sports buys land in the last hour before the game and another 22.4% in the first hour of play.

The first hour of play is the one to watch. From June 2026, S, A and B wallets came in at plus 3.07 points on their first-hour buys and D and F wallets at minus 3.03, six points apart on the same games in the same hour. A run of S or A buys on one side in the minutes after a goal or an injury, while the price is still moving, is the sharpest signal this site carries. A run of D and F buys on the side that just scored is the other thing.

The free feed is delayed and the Pro feed is live; the exact delay is stated on the page. For pre-game reading the delay costs little, because a buy from yesterday evening is the same fact today. For in-play reading it costs the signal, because a live price moves in seconds. The study behind the timing is at 0xinsider.com/research/when-large-sports-bets-land.

A grade is a summary. Click any wallet in the holders list or the feed and its profile shows what the summary is made of: settled markets, win rate, average entry price, the calibration edge, realized P&L, and badges for the categories it has a record in. A wallet graded A on politics with twelve settled soccer markets is a strong wallet and a weak sports signal. A wallet graded B with 900 settled tennis markets and a positive edge in tennis is the signal you want on a tennis game.

The census at 0xinsider.com/research/how-many-polymarket-sports-bettors-are-profitable says what the letters mean in sports dollars. Of wallets with 20 or more settled sports markets, S wallets were in profit 85.8% of the time with a median sports P&L of $124,465; B wallets 79.4%; D wallets 40.0%; F wallets 24.6%, median $4,618 down. The grade is built from that record, so this is a description of the letters rather than a forecast, but it tells you what kind of bettor you are reading.

Two things to weigh with it. Size is not skill: the study at 0xinsider.com/research/smart-money-vs-whale-size found the dollar amount of a buy says less than the grade of the buyer, and a $50,000 buy from an F wallet is still an F wallet's opinion. And a short record is a short record. A wallet with 30 settled markets and a 70% win rate has shown you a good month; the sample-size section of 0xinsider.com/learn/sports-betting-analytics-guide has the arithmetic for why.

The pick of the day at 0xinsider.com/pick-of-the-day is this whole workflow run once a day and published. It is one position that S, A and B wallets already hold, released one hour before kickoff with the side and the price frozen at that moment. The archive records the entry price and the market's last price before kickoff, so every pick's closing line value is public, and the stats page breaks the record down by sport, month and entry price.

Read it two ways. As a pick, it is one game a day where the profitable wallets' side has been checked for you, with the price it was checked at. As a worked example, it shows the shape of a good read: the side named, the price recorded before the game, the result read from the market's own settlement, and the closing price beside the entry so the pick is graded on price as well as on outcome. The guide at 0xinsider.com/learn/closing-line-value explains why that last part is the one professionals care about.

Its record is on the stats page, updated as picks settle. Read it there rather than from any summary, because a win rate quoted on a given day is a sample from a record that is still growing.

Watching a feed through every game is a job. Alerts do the watching. A custom alert fires when a large trade matches your filters: a category such as soccer or the NBA, a minimum size, and whether the wallet is new. Set one for your sport at $25,000 and up and the runs described in step 4 arrive as notifications instead of scrolling past. The guide at 0xinsider.com/learn/how-to-set-up-custom-trade-alerts walks through it.

Following a wallet does the same for one bettor. Find a wallet in step 5 whose sports record you trust, follow it, and its fills on the games you care about arrive with the rest. The guide at 0xinsider.com/learn/how-to-follow-trades-real-time covers following and the notification options.

Put the numbers from the studies side by side and the order of the steps explains itself. A well-graded consensus before kickoff: the price is right, minus 0.28 points across 1,060 games. A single S, A or B buy before kickoff: plus 0.27 points, within noise. A well-graded buy in the first hour of play: plus 3.07 points. A single D or F buy before kickoff: minus 0.42. A D and F consensus of 90% or more before kickoff: minus 3.68 for that side, which is plus 3.68 for the other.

So before the game, the strongest signal on this site is a crowd to fade, and the profitable wallets mostly confirm the price. During the game, the strongest signal is a profitable wallet moving first. Read the boards and the holders before kickoff to find the fade, and read the feed after kickoff to find the move.

Following a large buy because it is large. The size of the stake is on the alert and the grade of the buyer is beside it; the grade is the one that predicted. Buying a week early because the sharp money is on it. Buys placed one to seven days before kickoff lost 3.21 points to the price and paid an average quoted spread of 18¢ against one cent on the day; the sharp wallets that bought early paid it too.

Treating a long Smart bar before kickoff as a discount. It is a confirmation, and a confirmation is worth having, but the fade study found that side priced at 70.3¢ and winning 70.0%. Paying the spread to join it at the ask is paying to agree. And treating twenty settled markets as a record. Half the wallets in the census with 20 to 49 settled markets were in profit; a handful of wins is a handful of wins.