"I'll just DevEx it" is one of those sentences that tells you someone hasn't done the arithmetic. DevEx — Developer Exchange — is the only legitimate way to turn Robux into real dollars, and it's genuinely good if you're an actual developer earning at scale. For everyone imagining their bought Robux or their traded pets quietly converting to cash, the real numbers are a cold shower.
The rate, and the spread it sits on
Roblox buys Robux back at roughly $0.0035 each — about $350 per 100,000 Robux. Now hold that next to the buy side, where Robux costs you somewhere around 1.25 cents each at retail. The same Robux: about 1.25¢ when you buy it, about 0.35¢ when Roblox buys it back. That's the 3.5x spread I keep coming back to, and DevEx is the side of it where you're the one getting the worse number.
The threshold locks out small amounts
You can't DevEx pocket change. There's a minimum — 50,000 Robux, last I checked the glossary — before you can cash out at all. Below that, your earned Robux is worth exactly nothing in dollars, because the door won't open. The DevEx cashout calculator bakes the threshold in, which is why it returns "you can't yet" more often than people expect.
The cut that happens before DevEx even starts
This is the part that quietly halves everything. Only earned Robux is DevEx-able — Robux you bought doesn't count. And most earned Robux arrives after the 30% marketplace cut has already taken its bite. Sell a 100-Robux gamepass and you keep 70. Then you DevEx that 70 at $0.0035 and land about 25 cents. So a gamepass that cost the buyer roughly $1.25 in purchased Robux puts about a quarter in your pocket. The platform stands at both ends of that transaction and takes a share at each.
Then the taxman
The $350-per-100k figure is pre-tax. DevEx payouts are income, and you owe taxes on them like any other income. Whatever the calculators tell you lands, the amount you actually keep is smaller again after that. Nobody making a "I'll cash out and buy a car" plan ever includes this line.
Who it's actually for
None of this makes DevEx a scam. For a developer with a game pulling real revenue, it's a legitimate, working payout pipeline, and at scale the per-unit spread matters less than the fact that the money is real. The mistake is the individual trader or spender who looks at an inventory or a Robux balance and mentally converts it to dollars at the buy-side rate. That conversion doesn't exist. The only conversion that exists is the narrow, taxed, threshold-gated one, and it runs in the direction that favors the house.
Run your numbers through the DevEx and marketplace tax calculators before you build any plan on top of them. The door out is real. It's just much smaller than the door in, and there's a toll booth on both.