Astros vs Mets Prediction Market Odds, August 29, 2026
| Spread | Total | ML | Best ML | |
|---|---|---|---|---|
Astros | +1 — | O 8.5 1% | 0%0% | — |
Mets | -1 — | U 8.5 — | 100%100% | 100% Kalshi |
| Spread | Total | Moneyline | Best ML | |
|---|---|---|---|---|
Houston Astros | +1 — | O 8.5 | 0%0% | — |
New York Mets | -1 — | U 8.5 — | 100%100% | 100% Kalshi |
Houston (68-67) leads the AL West and prices as the 45c road underdog at Citi Field, because New York (60-75) hands the ball to Nolan McLean (9-8, 3.21 ERA) while the Astros open with reliever Bennett Sousa (1-3, 6.27 ERA) in front of a bullpen game. The Mets are 56c on both Kalshi and Polymarket, up from 54c overnight. First pitch is 4:10 PM ET on August 29, 2026, with about $123K of lifetime volume on the board.
Houston is the better baseball team by eight games in the standings and the underdog on the board. The Astros (68-67) come into Citi Field leading the AL West by two games over Texas (66-69), while the Mets (60-75) sit last in the NL East, 20 games behind Atlanta. The market does not care: New York is the 56c favorite (56c on Kalshi, 56c on Polymarket) against Houston at 45c on both books, because the pitching matchup runs entirely the other way. Nolan McLean (9-8, 3.21 ERA) starts for the Mets. Houston has Bennett Sousa (1-3, 6.27 ERA, zero saves) on the mound, a reliever profile that reads as an opener in front of a full bullpen game. First pitch is 4:10 PM ET at Citi Field, confirmed by both the Kalshi contract ticker and the ESPN schedule.
Astros vs Mets Market Context
The board carries roughly $123K in lifetime volume across Kalshi and Polymarket, with the two moneyline sides holding about $21K each and the game total holding more than either. That distribution is the tell: traders here have a stronger opinion about how many runs get scored than about who wins.
Line movement backs that up. The Mets opened this snapshot window at 54c on Kalshi at 8:06 PM ET Friday evening and traded up to 56c by late Saturday morning, touching 57c along the way. Polymarket tracked the same drift, 55c to 56c. Houston came the other direction, 46c to 45c on both venues. Two cents of movement toward New York is modest, and it arrived alongside a falling total: the O/U 7.5 line opened at 57c on Kalshi and settled to 54c, while Polymarket climbed from 51c to the same 54c. The books started three to six cents apart on the total and finished agreeing to the cent, which is what convergence into first pitch normally looks like.
The run line moved with the total rather than with the moneyline. Mets -1.5 traded from 40c down to 38c on Kalshi (37c on Polymarket, a 37.5c average), so the market raised New York's win probability while lowering its blowout probability at the same time. That combination is coherent for a game priced around a low total: a 7.5-run environment produces more one-run outcomes and fewer multi-run cushions. Houston -1.5 sits at 32.5c (32c Kalshi, 33c Polymarket). The 1st 5 Innings total of 4.5 runs prices at 47.5c, and the market gives a run in the first inning a 48c chance.
Cross-platform, the two exchanges are quoting this game identically where it matters. Moneyline, 7.5 total and 8.5 total all match to the cent, and the widest full-game gap is one cent on the run line and on the O/U 9.5 (35c Kalshi, 34c Polymarket). There is no venue-selection angle on the main markets today.
The home run props are the exception, and the pattern there is structural rather than a disagreement about any one hitter. Kalshi prices every home run line above Polymarket: Francisco Lindor at 17c versus 9c, Carson Benge 12c versus 7c, Christian Walker 12c versus 7c, Bo Bichette 11c versus 6c, Jeremy Pena 9c versus 5c, Jose Altuve 7c versus 4c. A gap that runs one direction across the entire prop set reflects how the two books build these contracts, not six separate mispriced players, so read it as a market-structure difference and not a signal about any hitter.
The busiest single prop on the board is Yordan Alvarez to hit a home run, 22c with about $18K traded, more than any market here other than the game total and the two moneyline sides. Alvarez is hitting .318 with 36 home runs and 91 RBI, and he is the Astros contract that carries the offense when the rotation is not available. His 1+ hits line prices at 67c and his 2+ hits line at 27c. On the New York side, the McLean strikeout market is the second-heaviest prop at $5.6K: 3+ strikeouts at 92c, the O/U 5.5 at 56c, 9+ at 14c. Carson Benge leads the Mets in both average (.279) and home runs (16), with Bichette carrying the team RBI lead at 66.
The stake asymmetry is the part the price does not show. Houston is defending a two-game division lead with a bullpen game in a National League park, and every loss here tightens the AL West market and its playoff odds. New York at 60-75 is playing out the schedule. A 45c road underdog with something to protect and no starter is the specific shape this board is pricing.
When the Astros vs Mets Market Resolves
The moneyline resolves to whichever team wins the game at Citi Field on August 29, 2026, with first pitch scheduled for 4:10 PM ET on SNY and Space City Home Network. Kalshi and Polymarket settle on the official final score, including extra innings. The run line and every total settle on that same final, and suspended or postponed games follow the rescheduling rules published by each platform rather than voiding automatically.
Key Astros vs Mets Catalysts
Pitching mismatch: McLean (3.21 ERA) against a Houston bullpen game fronted by Sousa (6.27 ERA) is the entire reason an eight-game-better team is a 45c underdog.
Bullpen depth: an opener start means Houston needs four or more relievers, and the market's 54c on Over 7.5 runs is a bet on that staff getting exposed late.
Yordan Alvarez: .318 with 36 home runs, and his 22c home run contract is the busiest prop on the board at roughly $18K traded.
Falling total with a rising favorite: the total came down from 57c to 54c on Kalshi while the Mets rose from 54c to 56c, which pushed the run line from 40c to 38c.
Division stakes: Houston leads the AL West by two games over Texas, so this is a leverage game for one side and a schedule filler for the other.
Prop pricing spread: Kalshi quotes every home run line three to eight cents above Polymarket, a book-construction difference rather than a per-player read.
Related Astros vs Mets Markets
Track the season-long picture on the Houston Astros hub and the New York Mets hub, which carry every active contract on each club across both exchanges. The AL West winner market is the one most directly moved by a Houston result in late August, with the Astros playoff market close behind. For the rest of the day's slate and every other cross-platform game board, start at the MLB hub.
Resolution Criteria
Resolves to the team that wins the game between the Houston Astros and New York Mets at Citi Field on August 29, 2026, first pitch 4:10 PM ET. Each moneyline contract pays $1 per share if that team wins and $0 otherwise, settled on the official final score including extra innings. The run line contracts (-1.5, -2.5, -3.5) settle on the final margin, and the game totals (O/U 7.5, 8.5, 9.5) plus the first-five-innings markets settle on runs scored in the covered period. Kalshi and Polymarket both settle from the official box score once the game goes final. A suspended or postponed game follows the rescheduling rules published by each platform rather than voiding automatically.
Key Factors
- Pitching mismatch: Nolan McLean (3.21 ERA) vs Houston opener Bennett Sousa (6.27 ERA)
- Houston bullpen game depth in a National League park with no designated starter behind the opener
- Yordan Alvarez home run contract at 22c, the busiest prop on the board at roughly $18K traded
- Game total fell from 57c to 54c on Over 7.5 while the Mets moneyline rose from 54c to 56c
- AL West stakes: Houston leads Texas by two games at 68-67 with a road bullpen game
- Kalshi prices every home run prop 3c to 8c above Polymarket, a book-construction gap not a player read
What are the current Astros vs Mets odds?
As of the morning of August 29, 2026, the New York Mets are 56c on both Kalshi and Polymarket and the Houston Astros are 45c on both. That implies about a 56% win probability for New York and 45% for Houston, with roughly one cent of spread across the pair.
Who is favored in Astros vs Mets and why?
The Mets are favored at 56c despite a 60-75 record against Houston 68-67, because New York starts Nolan McLean (9-8, 3.21 ERA) while the Astros open with reliever Bennett Sousa (1-3, 6.27 ERA) ahead of a bullpen game.
Where can I trade the Astros vs Mets market?
The game trades on both Kalshi and Polymarket, with about $123K of lifetime volume across the board. Kalshi carries the deeper prop menu including player strikeouts and total bases, and Polymarket covers the moneyline, the main run line and the primary totals.
What is the Astros vs Mets run line and total?
The Mets -1.5 run line prices at 37.5c (38c Kalshi, 37c Polymarket) and the Astros -1.5 at 32.5c. Over 7.5 runs is the busiest total at 54c on both books, with Over 8.5 at 45c and Over 9.5 at 34.5c.
What should I watch before Astros vs Mets resolves?
Watch the Houston bullpen usage once Sousa exits, since the 54c Over 7.5 total is effectively a bet on that staff. Also track the AL West market, where a Houston loss cuts a two-game lead over Texas with roughly a month left in the 2026 season.