Crypto Betting & Bitcoin Sportsbook
Crypto betting on OVERDOG means backing soccer, the NFL, the NBA, UFC and the biggest esports at prices pulled straight from the Polymarket exchange — set by traders, with no bookmaker margin baked in. You fund in Bitcoin or another supported coin, bet without an identity check, and settle on-chain.
It works as a Bitcoin sportsbook in what it lets you do, and as an exchange terminal in how it does it: nobody at OVERDOG takes the other side of your bet, so there is no vig inside the price and no reason to close an account that keeps winning. This page covers what you can bet, what a bet actually costs, and where the risk sits.
Betting is entertainment, not income — stake only what you can afford to lose.
What sports can you bet on with crypto?
Soccer is the deepest book on OVERDOG — the Champions League, the Premier League, MLS, Liga MX and the Brazilian Série A — followed by basketball, baseball and tennis. American football, MMA, cricket, Formula 1, golf, boxing and ice hockey all run as live exchange markets, alongside a full esports tree. Every sport has its own page with its leagues, teams and bet types.
Soccer, basketball and baseball
The Champions League and the Conference League carry the most money on the board, with MLS, Liga MX, the Brazilian Série A and Copa Sudamericana running alongside them and the Premier League returning each August. NBA and MLB markets trade through their seasons, and each competition is a page of its own rather than a row buried in a menu.
Tennis, MMA, motorsport and the rest
Tennis runs almost continuously across the ATP and WTA tours, which makes it the most reliable in-play book here. UFC fights, Formula 1 races, golf majors, cricket including the IPL, NRL rugby league, boxing and darts all list as exchange markets, so a smaller sport gets the same order-book pricing as a marquee one.
Every market on a match
A match is not one bet. Alongside the match winner you get handicaps and totals, first-half and second-half lines, both teams to score, exact score on soccer, set winners and set handicaps on tennis, and player props — points, rebounds and assists in basketball, home runs and strikeouts in baseball. Each one is its own market with its own book, so you can take the specific view you have rather than the one a bookmaker chose to price.
Outrights and futures
Season-long and tournament markets are the deepest part of the board: who lifts the Champions League, who wins the title race, who takes a Formula 1 championship or a golf major. These run for months rather than ninety minutes, and because they trade continuously you can take a position early and sell it later instead of waiting for the trophy to be handed over.
The esports board
League of Legends, Counter-Strike 2 and Valorant carry the esports book, with Dota 2, Mobile Legends, Honor of Kings and Overwatch listing when their circuits run. Esports markets settle exactly like the sports ones — same order book, same fee, same on-chain resolution.
Crypto betting with no vig
A sportsbook builds its margin — the vig — into every price it quotes, so the implied probabilities on a market add up to more than a hundred per cent and the difference is the house edge. An exchange has no margin to build in, because no one is quoting: traders post prices to each other, and OVERDOG charges a stated fee instead of hiding one inside the odds.
What "no vig" means
No vig means the price you see is the market's own view of the probability, with nothing added for the operator. On a two-way sportsbook market the two prices imply more than certainty, and that overround is what you pay. Here the two sides of a market price against each other, so the implied probabilities sum to certainty and the cost of betting is charged openly instead.
Where no-vig odds come from
Each outcome trades as a share priced between zero and one, which reads straight off as a probability. We display it as decimal odds so it looks like a sportsbook, but the number is the best price currently resting on the Polymarket order book — posted by another trader, not by a desk that profits when you lose. That is what makes it a no-vig line: nobody marked it up before you saw it.
What a bet actually costs
OVERDOG charges a flat 1% fee on a bet, and Polymarket charges its own taker fee on top of that. Those two together are the entire cost — there is no vig hidden inside the price, because the price belongs to the order book. Polymarket's share is heaviest on longshots and shrinks towards nothing as a price approaches certainty, so backing a strong favourite costs you less than backing an outsider. The exact figure at each price is published further up this page.
Anonymous, no-KYC crypto betting
Anonymous crypto betting means exactly this: there is no identity check on OVERDOG. You do not upload a passport, a utility bill or a selfie to open an account, browse the board or place a bet — the account is a crypto wallet, and the deposit is the only thing that has to arrive. That is the ordinary way a crypto sportsbook works, and it is the main reason people look for one.
No ID check to browse or bet
Every market, price and league page is readable without an account at all. Unlike most no-KYC betting sites, signing in creates a wallet-backed account rather than a verified identity, and funding it means sending crypto rather than handing over documents. There is no verification queue between a deposit and a bet, and none between a winning bet and a withdrawal.
What is public and what is not
Anonymous is not the same as invisible, and we would rather be precise about it. OVERDOG holds your account's key, so we are a custodian, not a self-custody wallet. Every fill settles on Polygon, so the trades themselves are permanently public on-chain — pseudonymous, tied to a wallet rather than a name. What we do not hold, and cannot leak, is an identity document, because we never asked for one.
Polymarket: the crypto betting exchange behind OVERDOG
Polymarket is a crypto betting exchange: an order book where traders take both sides of a market, and OVERDOG is the terminal in front of it. Every market on OVERDOG is a real Polymarket market. We are the access layer — the terminal, the bet slip, the live board and the sport pages — routing orders onto Polymarket's exchange rather than running a book of our own. That is why there is no house here to take the other side, and why a bet you place is a position other traders can trade against.
A verified Polymarket builder
OVERDOG routes as a verified builder, and Polymarket publishes its builder register openly, so the relationship is something you can check in a click rather than a badge you have to believe. The volume routed under our builder code is visible on-chain alongside it.
How markets resolve on-chain
A sports market here is a prediction market, so it does not pay out on a bookmaker's say-so. When an event finishes, the market resolves through Polymarket's decentralized oracle, winning shares redeem for one dollar each, and the payout is recorded on Polygon for anyone to inspect. OVERDOG cannot move a line, void a winning bet or revisit a settled result — the resolution is not ours to make.
We don't ban winners
The thing nobody advertises about a sportsbook is what happens when you win. Consistent winners get their stakes cut to pennies, their accounts closed, or their bets held for review — the industry calls it gubbing, and it is the ordinary business model, because a bookmaker takes the other side of your bet and loses when you win. Even betting exchanges surcharge their most successful customers.
Why we have no reason to limit you
We are not on the other side of your bet — another trader is. Our flat 1% fee, and Polymarket's own fee alongside it, are the same whether you win or lose, so a winning account is worth more to us than a losing one: it keeps trading. Our incentive is that you stay in the market, not that you go broke in it. That is a structural fact about how we make money, not a promise about how nicely we intend to behave.
What limits your bet instead
The order book does. There is no house rule capping your winnings, but you can only be filled against the liquidity actually resting at a price — so a very large bet walks up the ladder and takes a worse average price, and a thin market fills a big ticket badly. That is market mechanics rather than policy: what bounds a stake is the depth other traders have posted, visible on the book before you commit, not a limit imposed on you for winning.
Funding with crypto
You fund and withdraw in crypto, and nothing else. There is no card, no bank transfer and no fiat rail anywhere in the flow — a deposit arrives on-chain, converts to the dollar-denominated unit the exchange trades in, and leaves the same way when you withdraw. Browsing costs nothing, so you only fund when you actually want a position.
Which coins you can deposit
Bitcoin, Ethereum, Solana, BNB, USDT and USDC, each with a page of its own explaining how betting with that coin works. The list is the set the Polymarket bridge genuinely accepts — we would rather list six coins that work than advertise a dozen and bounce your deposit.
Withdrawals and key export
Withdrawals go back out on-chain, and your account key is exportable on request, behind your second factor — it is the owner key for your wallet. Withdrawal itself is always open: no hold, no cooling-off period, no approval step, and every withdrawal is a Polygon transaction you can check for yourself. That is what "we can't freeze you" rests on — an exit that stays open and that you can audit, rather than a promise you have to take on trust.
No exposure to your deposit coin
Positions are denominated in the exchange's dollar unit, so once you are in a bet your deposit coin's price swings no longer move it. A Bitcoin deposit does not turn a winning bet into a losing one because Bitcoin fell overnight, and you choose when to convert back out.
Is crypto betting safe?
Betting carries real risk: you can lose what you stake, and exchange prices move fast enough that a position can turn over before a match does. Real odds, a stated fee, custody you can exit and on-chain settlement remove the ways an operator can cheat you — they do not remove the way a bet can lose. Stake only what you can afford to lose.
Know the risk
A market can resolve against you, a price can swing hard on news, and a thin book can fill you worse than the screen suggested. Betting can also be addictive; if it stops being something you enjoy, step away — your balance is withdrawable at any time. Our responsible-gambling page is honest about what we do and do not do about it.
Where you can bet
Availability depends on where you are, and you are responsible for the law that applies to you. Crypto betting is legal in some jurisdictions, restricted in others and prohibited in a few — check your own before you deposit, because a no-KYC platform will not check it for you.