How Do Prop Firms Make Money? A-Book vs B-Book

Before you pay for a challenge, ask: how do prop firms make money? The answer tells you whether the firm wants you to win or needs you to lose. In crypto, where books can live onchain, you can increasingly check it yourself.

How Do Prop Firms Make Money? The Main Revenue Streams

Prop firms typically combine a few income sources:

Evaluation fees. You pay upfront for a challenge, and the firm keeps the fee pass or fail. For many legacy firms, it's the main revenue source.
Profit split. Once you're funded, you keep most of the profit and the firm keeps the rest. That share only exists if traders make money.
Resets and add-ons. Retrying a failed challenge usually costs another fee.
Trader flow and signals. A hedging firm can use trader activity as an input. Propr, for example, says each trader's signals feed into its hedging algorithm.

The mix matters. A firm that lives on evaluation fees has very different incentives from one that lives on funded traders' profits.

Prop Firm A-Book vs B-Book: What's the Difference?

B-Book: The Firm Takes the Other Side

On a B-book, your trades never reach the market: you're on a simulated account, and the firm is your counterparty. Every dollar you win comes straight out of the firm's pocket, and every dollar you lose stays there.

That creates a structural conflict: when the business runs on evaluation fees and trader losses, the firm doesn't need its traders to succeed.

A-Book: Flow Hedged in the Market

On an A-book, trader flow is actually hedged in the market. If you go long, the firm puts on a matching position, so it earns its profit split when you win. That aligns the platform with the trader instead of pitting them against each other.

Hybrid Models

Many firms run a hybrid: evaluations stay simulated, and only funded or consistently profitable traders get hedged. Hybrid isn't automatically bad. What matters is whether the firm tells you which model applies to your account, and whether you can check it.

Are Funded Accounts Simulated?

Often, yes. At many prop firms, both the challenge and the "funded" account run in a simulated environment. Payouts are real money, but your trades may never touch an order book.

That isn't a scam by itself; it's how much of the industry works. The issue is disclosure. If a firm calls an account "funded" without saying whether your trades are hedged, ask. Onchain prop firms make this easier: Propr, for instance, hedges publicly on Hyperliquid.

Are Crypto Prop Firms Legit? How to Check

"Crypto prop firm" covers everything from legacy firms that just added crypto deposits to firms running their rules and payouts onchain. Here's how I'd judge one:

Follow the incentives. Ask how the firm makes money. Heavy reliance on evaluation fees plus B-booking is a red flag, even if payouts arrive.
Verify hedging onchain. If a firm says it A-books, look for the hedges on a public venue like Hyperliquid.
Verify payouts onchain. Payouts sent in stablecoins to wallets leave a public trail. Hypernova goes further: payout eligibility lives in smart contracts, and traders are paid from an onchain reserve with no manual approval.
Check the treasury. A visible onchain wallet or reserve shows whether there's money behind the promises.
Know which dashboard you're reading. Onchain dashboards read from smart contracts and blockchain transactions. Offchain dashboards pull from the firm's own database, so you're taking its word for it.

Nothing guarantees safety, but the more that lives onchain, the less trust you need to extend.

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