Bonus Buy (Feature Buy)

Key Takeaways

• Bonus buy sells immediate entry to the feature — usually free spins — for a fixed multiple of the bet, most commonly in the 50–100× range, with premium options far higher.
• You buy the trigger, not the outcome: the purchased round is as random as a naturally triggered one, and most rounds land below their mathematical average.
• Buy RTP is certified separately and disclosed alongside base RTP; the two often differ by fractions of a percentage point in either direction.
• The mechanic concentrates stake into single high-variance events — the reason it is banned in the UK and restricted in several other markets, with market-specific builds shipping without the button.
• In the SlotCodex catalog (July 2026 snapshot) the feed's explicit bonus-buy flag marks 157 games from 33 providers — a conservative lower bound, since many feeds under-report the flag.

How Bonus Buy Works

The button — "Buy Feature", "Bonus Buy", a lightning icon — sits beside the spin controls and lists a price as a bet multiple. Press it, confirm, and the game deducts the price and starts the feature's trigger animation as if the scatters had landed naturally.

Design variants in circulation:

Two structural facts hold across all of them. The purchased feature runs on the same certified math as the organic one (or a separately certified variant, disclosed as such). And the buy price is a published constant — it does not adapt to your history, balance or session.

The Math: what the price buys

A buy is a fixed-price wager on the feature's value distribution. If the feature's expected value is E (in bets) and the price is P:

buy RTP = E / P

Example: a feature averaging 76.8× sold at 80× yields 96.0% buy RTP. Studios tune P so buy RTP lands close to base RTP — but "close" is a design choice. Published game sheets show buys running from roughly a point below to a point above their base game; the paytable's dual disclosure is the only authoritative source per title.

What the arithmetic hides is the distribution. A feature averaging ~77× in a high-volatility game might realistically look like:

• ~50–60% of rounds returning under 50× (price not recovered),
• a median somewhere near 40–55×,
• a small tail of 500–10,000×+ rounds carrying the mean.

Buying at 80× therefore loses money on most purchases by construction — exactly like the base game over an equivalent stake, but compressed into one event. Ten consecutive losing buys at 100× is an unremarkable outcome, and a bankroll sized for 1× spins is off by two orders of magnitude for buy sessions.

Buys and volatility perception

The buy deletes the base game — and with it the slow bleed and the anticipation. Statistically, a session of buys is a session of samples straight from the feature distribution: fewer, larger, faster swings. Nothing about the game's certified math changed; your exposure profile did.

Bonus Buy vs related mechanics

• vs organic triggers: identical feature, different acquisition; the organic path pays base-game returns while you wait, the buy converts waiting into a lump-sum price.
• vs hold-and-win buys: coin-feature games sell entry the same way; the value question shifts to seeded coin values rather than spin modifiers.
• vs gamble features: the classic "double or nothing" gamble wagers a win at (near-)even odds; the buy wagers fresh stake on a whole feature distribution.

For Players

• Compare both RTP figures in the info screen. If the buy RTP is lower than base RTP, you are paying a premium for impatience; if higher, the buy is the mathematically cheaper way to experience the game. Both cases exist.
• Rescale your bankroll math. One 100× buy equals a hundred spins' stake resolved in thirty seconds. If your session budget is 200 bets, that is two buys — treat it that way before the first click.
• Expect the median, not the mean. The showcase 5,000× rounds fund themselves from the far tail; a typical buy returns less than its price. Anyone selling a "buy strategy" is selling variance.
• Chance buys are the same product with extra steps. A 25% shot at the feature for a quarter of the price has the same expected value profile — the discount is probabilistic, not real.
• Where the button is missing, it's the law, not the operator. UK players (and several other markets) get builds without feature buy by regulation; VPN-shopping for buy access also voids the local player protections attached to that build.

For the Industry

• Buys re-shape session economics. Average bet-per-round jumps and session length compresses; bonus-buy-heavy player segments need separate LTV and risk models, since standard spin-based telemetry misreads them.
• Dual-RTP disclosure is table stakes. Certifying and publishing buy RTP separately (now standard practice among major labs) preempts the most common fairness complaint; burying the delta between base and buy RTP is reputational risk with data-literate audiences.
• Market-build fragmentation is operational reality. UK-compliant builds without the button, plus jurisdictions restricting chance buys specifically (gambling-on-gambling concerns), mean the "same game" ships in multiple feature configurations — catalog and BI systems must model buy availability per market, as SlotCodex does via per-market flags where feed data allows.
• Responsible-gambling interface. One-click 100× staking interacts with deposit/loss limits differently than incremental play; operators in regulated markets increasingly gate buys behind the same friction as large single bets. Treating the buy as a distinct wager class in RG analytics is emerging best practice.