Laying the Points or Taking Them? 30,158 Large Polymarket Spread Bets, and How Often Games Are Decided by One

Polymarket lists a point spread as its own market, titled with the team that gives the points: "Spread: Detroit Tigers (-1.5)", with the two teams as the outcomes. The rules resolve it to the Tigers "if the Detroit Tigers win the game by 2 or more runs", and to the other team otherwise, a tie included. Buying the named team is laying the points. Buying the other team is taking them.

Polymarket often lists several lines for a game, for either team. The Bills and Texans game on September 13, 2026 carried 35 spread markets, from Bills -0.5 to Bills -21.5 and from Texans -1.5 to Texans -21.5, all listed before kickoff. So the team at minus on a given line is not always the team the market favored, and a count of how often favorites cover would depend on which line you call the game's line.

The price settles that. Every large spread bet was bought at a price, and every market settled, so whether laying or taking the points was the cheap side is a comparison of prices with results. This study makes that comparison for every large spread bet from April 2, 2026, and uses the games that list both teams at the same line to count how often a game is decided by one.

The count covers every Polymarket spread market with a title in that form, a kickoff on record and a settled result, from the first on March 26, 2025 to September 13, 2026: 79,769 markets on 23,765 games, 3.4 lines a game. Soccer holds half of them. MLB, college basketball, college football, the NBA, the NFL, the NHL and the WNBA hold the rest.

The direction was checked against results. In 17,571 markets where the named team covered and the game had a moneyline, the same team won the game 17,571 times: every time.

The pricing half uses the large-trade alerts from April 2, 2026, the first day the alert table's outcome labels are trustworthy (0xinsider.com/research/favorite-longshot-bias-polymarket-sports documents why): 30,158 buys by 2,392 wallets across 2,972 markets, $565.9 million in stakes, 28.6% of them after the start. Edge is the share of buys that won minus the average price paid, in percentage points. Intervals resample markets rather than buys, because thirty large bets on one line are one result.

Across every sport, large buyers who laid the points came in 4.68 points ahead of the price over 13,902 buys on 2,030 markets. The interval, resampling markets, runs from plus 0.25 to plus 9.12. Large buyers who took the points came in 2.82 points behind over 16,256 buys, with an interval from minus 6.84 to plus 1.28.

Sports betting folklore says the opposite: the public backs the team giving points, so the value sits with the team taking them. On Polymarket in 2026 the side giving the points was the cheaper one. The lower end of the laying interval sits a quarter of a point above zero, so read it as a lean the data supports, not a law.

Basketball carries the result, and basketball here is the NBA: 13,314 of its 13,886 buys. Laying the points paid 52.3 cents and won 57.6% of the time, plus 5.32 points and plus 11.8% on the dollar. Taking them paid 51.7 cents and won 46.2%, minus 5.41 points and minus 10.2% on the dollar. Both intervals stop just short of clearing zero.

Soccer here is mostly the 2026 World Cup, 10,568 of 13,243 buys on 355 World Cup markets. Laying the points came in plus 5.11 and taking them minus 0.74. MLB run lines came in behind on both sides, minus 0.64 laying and minus 3.13 taking, and NHL puck lines showed the widest split on the fewest bets: plus 9.21 laying and minus 7.65 taking, across 443 buys.

Football is missing for a reason: the pricing window starts April 2, after the 2025 NFL and college football seasons ended, and the 2026 seasons had just begun by September 13. The whole window holds 94 large football spread buys on 54 markets, too few to read.

Before the start, laying the points paid 48.7 cents and won 52.9% of the time, plus 4.20 points with an interval from minus 0.85 to plus 9.11. Taking them paid 58.5 cents and won 55.5%, minus 3.03.

During play, laying the points paid 57.9 cents and won 63.9%, plus 6.00 points over 3,700 buys, with an interval from plus 2.01 to plus 9.93: the only split by phase, price or grade that clears zero on its own. Taking the points in-play came in minus 2.35. A live spread moves with the score, and in this window the buyers of the team giving points during the game were paid for it more often than the price said.

The lean holds across the middle of the price range, where most large spread buys land. Laying the points at 30 to 50 cents came in plus 5.64 over 5,313 buys, and at 50 to 70 cents plus 4.53 over 7,250. Taking the points at 50 to 70 cents, the busiest band of all with 8,039 buys, came in minus 4.78.

At 70 cents and up, taking the points came in ahead too: it paid 83.9 cents and won 86.2% of the time, plus 2.36. No single band's interval clears zero; the bands are the all-sports result cut four ways.

From June 1, each buy carries the grade its wallet held that day. Wallets graded S, A or B came in plus 5.46 points laying the points and plus 0.84 taking them. Wallets graded D or F came in plus 5.28 laying and minus 6.11 taking.

Both cohorts did about equally well laying the points, which says the result belongs to the side of the market rather than to the skill of the bettor. Where the grade separates is taking the points: the graded wallets roughly broke even there and the poorly graded ones lost. Every interval spans zero; the June-onward samples sit on a few hundred markets per cohort.

A run line of -1.5 loses whenever the game is decided by one run, whichever team wins. Polymarket listed minus lines for both teams in 74.1% of the MLB games with spreads, and a -1.5 line for both teams in 1,882 games, where neither covering means a one-run game. Of those 1,882 games, 548 were decided by one run: 29.1%, with a half-width of 2.05 points.

The rate holds through the season: 26.3% in April, between 29.3% and 29.9% from May through July, 27.3% in August and 33.9% over the first 168 games of September.

For a run-line bettor that is the whole trade: backing a team at -1.5 instead of on the moneyline gives up every win by exactly one run, in exchange for a better price, and one-run games were about three in ten of all games. The price has to be better by enough to cover the one-run wins it gives up.

Soccer lists handicaps for both teams in 80.3% of matches, which makes the winning margin countable. On 7,528 matches listing -1.5 and -2.5 for both teams, with the match's draw market, 25.7% ended level, 38.6% were won by one goal, 20.2% by two and 15.6% by three or more.

So a -1.5 handicap, a bet on a two-goal win, loses to a draw and to every one-goal win, which together make up almost two results in three. Across the 9,016 matches that listed -1.5 for both teams, one team or the other won by two or more 35.3% of the time. A single team's chance is lower, and the handicap price has to be read against it.

It does not say how often favorites cover. Polymarket lists a ladder of lines for both teams, and this study does not pick one line as the game's line; the price large buyers paid is the measure it uses instead.

It does not cover football pricing, which holds 94 large buys, and its other sports come from particular stretches: NBA games from April 2 to June 14, soccer mostly from the World Cup, MLB from April to mid-September. A rerun over a football season could change the picture.

The one-run and margin figures use games listing both teams at the same line, which is most MLB games and most soccer matches. The NHL lists both teams in about a fifth of its games and basketball and football far fewer, so their subsets are not counted as their sports.

Many splits were tested here, and the all-sports laying interval clears zero by a quarter of a point. Every position is scored as held to settlement at the buyer's price, before fees.

Taking the points is not a free edge on Polymarket. In 2026, large bettors who took the points came in behind the price and bettors who gave the points came in ahead, most clearly in the NBA and during play. The practical reading is modest: judge the side on its price, and do not assume the team getting points is the value.

Know the margin you are betting. A -1.5 run line in MLB loses every one-run game, about three games in ten, including the ones its team wins, and a -1.5 soccer handicap loses to every draw and every one-goal win. The alternate lines on a Polymarket game let you choose how much margin to lay; each extra point costs price, and the margins above say what it buys.

Every game on 0xinsider.com/sports opens to an event page whose Markets section lists the Polymarket markets by family. The Spread family lists each line with its own volume and both sides of it, "Detroit Tigers -1.5" beside "Colorado Rockies +1.5", with the price change over the last hour and the last 24 hours. A "Where the money is" line ranks the families by volume: on the Bills and Texans page on September 13, $956K of the $2.5M traded was on spreads.

The event page's Top holders tab lists the wallets holding each outcome with the grade each has earned, and the whale alerts feed at 0xinsider.com/whale-alerts shows every large spread trade as it fills, marked BUY or SELL, with the wallet's grade. The guide at 0xinsider.com/learn/point-spread-betting-explained covers how spreads, run lines, puck lines and soccer handicaps work.

Every number on this page comes from one read-only run of a set of queries against the production database at 20:45 UTC on September 13, 2026. The query text, the raw output, the market-level export and the bootstrap output are public at github.com/0xinsider/research, under polymarket-sports-markets, in the files whose names carry the word spreads. The export is committed, so the intervals reproduce with the bootstrap alone and no database.

The market universe is every settled Polymarket spread market titled "Spread: <team> (-X.5)" whose first outcome is that team, with a kickoff on record, in the eight sports categories named above. The pricing universe is every large-trade alert for a Polymarket buy on one of those markets, settled after the trade, at 2 to 98 cents, from April 2 to September 13, 2026. The grade is the most recent daily ranking dated on or before the trade day.

Expect the counts to grow and football to fill in as its season runs. The one-run rate should hold within its half-width; the laying lean is the figure a rerun is most likely to move, since its interval sits close to zero.