The core mechanic
Back one side at Book A. Hedge the other at Book B.
Every play is two bets on one game: your promo bet on one team at the offer book, and a cash bet on the opposite team at a second book, sized with a formula so every possible outcome nets the same amount. One of the two teams must win — so you're covered either way. (In the UK this is done on a betting exchange; in the US you simply use a second sportsbook. Same math.)
One offer, every dollar shown
Worked example: “Bet $5, get $200 in bonus bets”
The most common welcome offer in the US. It runs in two phases: qualify (a tiny real-money bet that unlocks the bonus) and convert (turning the bonus — which can never be withdrawn directly — into real cash). Here is the whole thing, to the cent.
Qualify — bet $5, hedge $5, lose 45¢
Put $5 cash on Team A at −110 at Book A, and $5.00 cash on Team B at −110 at Book B. Whichever team wins, one bet pays $4.55 profit and the other loses its $5 stake — a guaranteed loss of $0.45 either way. That 45 cents is the entire price of admission, because this offer pays the $200 bonus win or lose.
Convert — turn $200 of bonus into $130.43 of cash
A bonus bet is stake-not-returned: if it wins you keep only the profit, never the $200 itself. So you place it on a longer-odds underdog (longer odds convert a bigger share) and hedge the favorite with cash at a second book:
- Book A: the $200 bonus bet on the underdog at +300 — pays $600 profit if it wins.
- Book B: $469.57 of your own cash on the favorite at −360 — pays $130.43 profit if it wins. (Hedge formula: $200 × (4.00 − 1) ÷ 1.2778 = $469.57.)
Bonus pays +$600.00 · hedge loses −$469.57
net +$130.43
Hedge pays +$130.43 · bonus expires worthless $0.00
net +$130.43
| Step | Book A (offer) | Book B (hedge) | Locked net |
|---|---|---|---|
1 · Qualify $5 cash on Team A at −110; hedge $5.00 cash on Team B at −110 | −$5.00 stake | −$5.00 stake | −$0.45 |
2 · Bonus lands Book A credits $200 in bonus bets, win or lose | +$200 bonus | — | $0 cash yet |
3 · Convert $200 bonus on the +300 underdog; hedge $469.57 cash at −360 | $200 bonus staked | −$469.57 stake | pending |
4 · Settle Whichever team wins, one leg pays and the other doesn't | wins → +$600.00 profit | wins → +$130.43 profit* | +$130.43 |
| Total kept, whichever teams win | +$129.98 | ||
*Book B settlement in step 4: −360 pays $0.2778 per dollar staked, so the $469.57 hedge returns its stake plus $469.57 × 0.2778 ≈ $130.43 profit — exactly what the losing bonus leg would have netted. Either way the play locks 65.2% of the bonus's face value as withdrawable cash — typical conversions run ~60–75% depending on how tight the two lines are. Note the hedge cash (~$470 here) must be sitting at Book B before you place the bonus bet; it isn't spent — it cycles back when the game settles.
The offer shapes
Five offer types, one skeleton
Every welcome offer is a variation on the same two-phase play — what changes is how the bonus triggers and how you size the hedge.
Bet & get (win-or-lose)
“Bet $5, get $200 in bonus bets”
The clean one — the bonus arrives regardless of the qualifier, so you place a tiny hedged qualifying bet and go straight to converting the bonus. Start here.
Second chance / first-bet refund
“First bet up to $1,000, back in bonus bets if it loses”
Value only appears when the first bet loses, so you deliberately under-hedge — sized so a win and a refunded loss are worth the same — and lock roughly 20–30% of the cap.
Profit boost
“50% profit boost token”
The boost multiplies winnings on a cash bet whose stake comes back, so you put it on a longer-odds pick, hedge the boosted payout, and lock a guaranteed profit instead of a loss.
Win-only bet & get
“Get $150 in bonus bets if your first bet wins”
A hedge can't guarantee the trigger, so you pair two win-only offers on opposite sides of one moneyline — exactly one must win, so exactly one bonus is guaranteed to land.
Deposit match
“100% deposit match up to $100”
Comes with a rollover requirement: a 1× playthrough converts like a normal bonus, while 5×+ casino-style rollovers usually aren't worth the churn — skip those.
Why the money is real
You're collecting their marketing budget.
Sportsbooks spend hundreds of dollars in promotions to acquire each new customer, betting that most people will bet emotionally and lose it back over time. Matched betting simply takes the acquisition spend and declines the second half of the deal. It's legal advantage play — unwelcome, like card counting, but not cheating. If that still sounds too good to be true, we wrote up the full skeptic's treatment at too good to be true?
The honest limits
What this is not.
It's mostly one-time per book
Nearly all the value is in each sportsbook's new-user welcome offer. Once a person has worked the books in their state, that inventory is spent — the value per person is real, finite, and front-loaded, not recurring income.
21+, licensed states only
This works only for adults 21+ in states with legal online sports betting, on the books licensed there. No VPNs, no borrowing accounts, no exceptions — the whole model depends on staying inside the rules.
Low-risk, not no-risk
The math locks the outcome only if both legs are placed correctly. Lines can move between placing leg one and leg two, a voided or pushed bet can break the hedge, and betting the same side twice turns a lock into a gamble. Execution discipline is the actual job.
Winnings are taxable income
Gambling winnings are taxable whether or not a form shows up, and loss deductions are restricted — keep records of every bet and talk to a tax professional. This page is education, not tax advice.
Books may limit your account
Sportsbooks can and do restrict accounts that only ever harvest promos. That's another reason the welcome offers — worked once, properly — are the play, rather than grinding small ongoing offers on a flagged account.
Not a promise
Regulators banned the phrase “risk-free” for a reason. Hedged correctly the downside is small and known — but it is still gambling exposure, and human error is real. Never tie up money you need. Adults 21+. 1-800-GAMBLER.
Where MatchDesk comes in
Run yourself first. Then run the people you know.
Because each person's welcome offers are one-time, the natural next step after working your own is walking friends and family through theirs — their account, their money, their clicks, your guidance — and splitting the profit. A typical run is worth $1,000+ per person depending on their state and how much they're willing to put on each bet — our simulations settle a full bet-the-max run at about $2,064 in Illinois and $3,150 in Michigan. MatchDesk is the console for that: pick their state, and it generates the worklist, sizes every hedge, and tracks profit and your fee per client.
See the numbers settle for yourself.
Every profit figure above traces to a simulation harness that reconciles predicted profit against settled cash — to the penny.