A wide-area progressive (WAP) jackpot and a standalone progressive both grow with every bet — but they grow in very different ways. The WAP pool is fed by machines across multiple casino properties, so it climbs fast and can reach life-changing sums. A standalone machine feeds only itself, which means the jackpot is smaller but statistically easier to hit.
How does a WAP jackpot get so large?
Every qualifying spin at every linked machine — whether at MGM Grand Las Vegas or MGM National Harbor — sends a slice of that bet into one shared meter. Hundreds or thousands of players are effectively buying lottery tickets into the same pool simultaneously. The result is a jackpot that can grow at a pace no single machine could match on its own. To understand the mechanics in more detail, see How Wide-Area Progressive Slots Actually Work.
What does a standalone progressive look like by comparison?
A standalone machine's meter grows only from spins on that one cabinet. Hit frequency is higher — fewer players competing for the same pot — but the top prize is a fraction of a WAP jackpot. Think tens of thousands of dollars versus potentially millions. The trade-off is real: easier to win, far less to win.
What is the RTP trade-off?
WAP slots generally carry a lower base-game RTP, commonly in the 85%–92% range, because a portion of every bet is diverted to grow the shared meter rather than returned to players in regular wins. Standalone progressives typically sit closer to the mid-to-upper end of that range because the jackpot contribution per spin is smaller. Neither type guarantees a profit — the house edge exists on both. The Why MGM Grand Millions Is Classified as Very High Volatility page goes deeper on what that RTP difference means for your session bankroll.
WAP vs. standalone: a side-by-side comparison
| Feature | WAP Progressive | Standalone Progressive |
|---|---|---|
| Jackpot size potential | Very large — shared across many machines and properties | Smaller — only grows from one cabinet |
| Hit frequency | Lower — more players competing for the same prize | Higher — fewer competing spins |
| Base-game RTP | Typically 85%–92% (portion diverted to shared meter) | Generally closer to the higher end of the range |
| Volatility | Very high — long dry streaks, rare massive hits | High, but less extreme than WAP |
| Example | MGM Grand Millions (linked across MGM Resorts properties) | Single-cabinet machine on a local casino floor |
Which type is right for your session?
If you are chasing a headline jackpot and can tolerate long stretches without significant wins, WAP slots like the mgm grand millions slot fit that goal. If you want more frequent smaller paybacks and a somewhat better base RTP, a standalone machine is the more conservative choice. Neither outcome is guaranteed. Set a firm session budget either way.
Keep tax implications in mind too. Any slot win of $1,200 or more triggers a W-2G regardless of the machine type — WAP or standalone. Read the full breakdown on what happens when you win $1,200 or more on slots before your session. For state-by-state tax rates on jackpot winnings, the state income tax on slot winnings page covers NJ, Michigan, Pennsylvania, and West Virginia.
Online WAP play is currently available in licensed states — New Jersey, Michigan, Pennsylvania, and West Virginia — through BetMGM Casino. Check where to play MGM Grand Millions online for real money for current operator availability in your state. If you plan to use a welcome bonus, confirm whether the game contributes to wagering requirements; WAP titles are commonly excluded or capped. Details are on the BetMGM bonus wagering page.
Must be 21+. High-volatility WAP slots carry elevated risk due to infrequent wins. Gambling problem? Call 1-800-GAMBLER or reach the National Council on Problem Gambling 24/7.