MLB odds
MLB odds on OVERDOG come off the Polymarket order book, not a house price sheet: every game is priced by traders buying and selling shares in an outcome. You fund in Bitcoin or another supported coin, bet with no identity check, and settle on-chain.
Baseball's depth comes from a different place than the football boards' does. It is not longer ladders — a college football game lists more shares than an MLB game — but more separate questions: the game divides cleanly into innings, so the front half trades as its own contest, the first inning gets a question of its own, and the widest player field on the board sits on top. Below: what a single game actually carries, those player markets, and the season-long pools that run beside them.
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MLB betting markets on a single game
Every MLB game on the board carries the moneyline. Around it sit the run line and the run total, and both of those are ladders rather than single numbers. Each market is a share you buy at the exchange price and can sell back while the book is there.
Moneyline: two outcomes, and no draw
The moneyline asks who wins, and baseball answers it more cleanly than most sports: there is no draw share, because a game that is level at the end of the ninth keeps playing extra innings until one club leads at the end of one. So the market is two mutually exclusive shares rather than three, and buying one is the same trade as selling the other.
The edge case is still written down rather than left to chance. The market's published rule says that if the game is cancelled outright with no make-up, or does end in a tie, it resolves fifty-fifty — the case that arises when weather ends a game early rather than in normal play. It is rare enough that most seasons pass without it, and specified anyway.
The run line, and the rungs beyond the standard one
Baseball's spread is called the run line, and its standard rung sits at a run and a half — that part of the usual description is right. What a sportsbook would call an alternate line, this board lists beside it: a second rung at two and a half on either club, and deeper rungs on the occasional game whose book supports them. The half-run exists so the adjusted result cannot land level.
The deeper rungs are what let you separate two claims the standard line cannot: that a club wins, and that it wins comfortably. On a heavy mismatch the run-and-a-half share can be short enough to be uninteresting while a deeper rung is still a real price — and you are choosing the threshold rather than accepting the one on offer.
Run totals across the full nine
The total asks how many runs both clubs score between them, and it too is a ladder — the lines span the range a normal game lands in rather than sitting on one number. As with the run line, the half-run means the total cannot tie the line.
The moneyline is the only market on every game. The total and the run line arrive together on the games with a real book behind them, and after those the most widely listed market on an MLB slate is not a team market at all — it is the first-inning question below.
The first five innings trade as their own game
The distinctive thing about an MLB board is that it prices the front half of the game separately. A first-five-innings book runs alongside the full-game one — its own winner market, its own spread and its own total — and it settles at the end of the fifth regardless of what happens afterwards.
The reason it exists is the starting pitcher. Through five innings you are usually still watching the two pitchers each club chose to start; after that the bullpens arrive and the game becomes a different question. Buying the first five is a way to bet the matchup you can actually see on the lineup card.
A three-way market where the full game has two
The first-five winner carries an outcome the full-game moneyline cannot: a draw. Extra innings break a tie at the end of the ninth, but nothing breaks a tie at the end of the fifth, so a level score after five is a real settled result with its own share and its own price.
The market's published rule says exactly that — it resolves to whichever club is ahead at the conclusion of the fifth inning, and to the draw if the score is level there. It is the one place on an MLB board where a tie has a priced share of its own, rather than a rule that splits the market.
First-five spreads and totals
The first-five spread and the first-five total repeat the full-game shapes at shorter distances: fewer innings means fewer runs, so the ladders sit lower. They settle on the same fifth-inning boundary as the winner market.
These are among the more commonly listed markets on the board, which is worth knowing if you arrived expecting them to be an exotic. On an MLB slate the first-five book is close to standard equipment.
The first inning and the extra innings
Two more questions carve the game at its edges. The first asks whether a run is scored in the first inning at all — a plain yes-or-no on the opening frame, and one of the most widely listed markets on the slate. Buying the no is the position usually called NRFI, for no run first inning; buying the yes is the position called YRFI, its exact complement.
The second asks whether the game goes to extra innings, which is a bet on the score being level at the end of the ninth rather than on who eventually wins. It appears only on a small number of games rather than across the slate.
Player markets on an MLB game
Beyond the team markets, an MLB game prices individual players — and unlike some of the other American sports on this board, these actually render here in quantity rather than existing only in the catalog.
Home run lines, batter by batter
The home-run market asks whether a named batter goes over or under a line of half a home run, with a second rung at a home run and a half for the hitters where that is a live question. Half a unit again, so the result cannot land on the line.
This is the widest player family anywhere on the board. On a well-priced game the home-run market alone runs to a couple of dozen separate shares — one or two per batter in the lineup — and it is the single biggest reason an MLB game lists as many questions as it does.
Strikeout lines for the pitchers
The strikeout market prices a named pitcher's total for the game as an over-under, and it is a proper ladder rather than one line: the rungs climb through the range a starter plausibly lands in, so you are choosing a threshold rather than accepting one.
Both player families appear on a subset of the slate rather than on every game — they need a real book behind them to be worth listing, and the quieter games do not have one.
MLB season pools: the World Series, the postseason and the awards
Above the daily slate run the season-long pools, and they do not all have the same shape. Reading which shape you are in is the difference between a bet that can only be won by one club and a bet that many clubs can win at once.
The World Series pool: one club redeems, and there is a catch-all
The championship pool prices all thirty clubs as separate shares, and exactly one of them resolves yes. It carries a catch-all row for the case where the winner is not among the listed names, and its published rule handles the season being cancelled or running past the stated deadline by resolving there too.
The rule that catches people out is the elimination clause: as soon as it becomes impossible for a listed club to win — the moment they are knocked out of the playoffs — that club's share resolves to no immediately. It does not drift toward zero while the postseason plays out, and there is no book left to sell into afterwards. If you wanted to exit, it had to happen while the question was still open.
The postseason pool is a different shape entirely
Beside the championship pool sits a market asking whether each club clinches a postseason spot — and this one is not mutually exclusive. Every club is its own independent yes-or-no, and many of them resolve yes in the same season, because many clubs make the playoffs.
That is a genuinely different instrument from the championship pool despite looking similar on screen: there, one share redeems and the rest go to zero; here, a whole group of shares redeems together. Read which question you are buying before you buy it.
Award pools and the home-run lead
The season also prices individual honours as pools of their own, though not every award and not both leagues: today that means a most-valuable-player field for one league, a pitching-award field for the other, and a market on who finishes leading in home runs. Their candidates are players rather than clubs, so a trade or an injury reorders the whole field without anything changing in the standings. Check which league a field covers before buying it — the counterpart award may not be listed at all.
These fields are longer than the club pools and their prices move on a different clock: a club pool reprices every night the standings move, while an award field can sit still for weeks and then move on one player's month.
Funding an MLB bet with crypto
Funding is crypto in, crypto out, with the trading in between denominated in a dollar unit:
1. Deposit a supported coin — Bitcoin, Ether, USDT, USDC, SOL or BNB — with no identity check. It converts to Polymarket's US-dollar stable unit on Polygon, the unit every MLB position is priced, traded and settled in.
2. Buy shares in the outcome you want at the exchange price — a moneyline, a run line, a first-five total, a World Series club. The cost is a flat 1% OVERDOG fee plus Polymarket's own fees, shown together before you commit.
3. Winning shares redeem for $1 each on-chain when the market resolves, and you withdraw back to crypto. There are no cards or bank transfers at any point in the flow.
Betting MLB on Polymarket with OVERDOG
OVERDOG is an access layer to the Polymarket exchange, not a bookmaker. An MLB order routes to Polymarket's real order book; what OVERDOG adds is a betting terminal over it, with crypto funding and no identity check.
No vig on MLB prices
Every MLB outcome trades as a share that pays $1 if it happens and nothing if it does not, so the price reads directly as the market's implied probability. Those prices come from an order book rather than from a margin added to a line — that is what no vig means. It describes how the price is built and never implies a bet will win.
It is a sharper distinction in baseball than in most sports, because the moneyline is where a book's margin usually sits and baseball is a moneyline sport.
No identity check, and your own custody
You deposit and withdraw in crypto with no identity check, and you can export your wallet and withdraw anytime — we can't freeze you. There is also no house position to defend, so betting MLB well never gets your account limited or closed. Settlement runs on-chain via Polymarket on Polygon, where every resolution is publicly verifiable.