Five positions off the Week 2 prop board, each one with the cheapest venue on that exact side sitting next to it.
That second half is the part worth twenty-one seconds of your time. Four of these five are cheaper somewhere other than Kalshi — and not because Kalshi's line is worse. Because the fee is real and almost nobody prices it in.
The card
Every number below is what the board read when the clip was cut on Sept. 19, 2026. Prop markets move faster than anything else on the slate — treat these as a snapshot, not a standing quote.
| # | Player | Game | Market | Side | Price | Cheapest on that side |
|---|---|---|---|---|---|---|
| 01 | Trevor Lawrence | JAX @ DEN | 2+ pass TDs | YES | 43¢ | Exchange only — no book posts it |
| 02 | Kenneth Walker | IND @ KC | 90+ rush yds | YES | 41¢ | BetRivers 41.2¢ · Kalshi 42.7¢ net of fee |
| 03 | Tyjae Spears | PHI @ TEN | 3+ receptions | YES | 52¢ | ProphetX 51.9¢ · Kalshi 53.3¢ net of fee |
| 04 | CeeDee Lamb | WAS @ DAL | 6+ receptions | NO | 46¢ | ProphetX 46.5¢ · Kalshi 47.7¢ net of fee |
| 05 | Wan'Dale Robinson | PHI @ TEN | 5+ receptions | YES | 43¢ | ProphetX 43.7¢ · Kalshi 44.4¢ net of fee |
The fee is the whole story
Here is the mechanic almost every prop write-up on the internet skips.
Kalshi's quoted price is frequently the sharpest number on a given market. But Kalshi charges a per-contract taker fee at the fill, and the fee is 7% × price × (1 − price) — charged when you buy, win or lose. It is not a cut of your winnings at settlement. It is a cost of entry.
Run that at a coin flip and it is about 1.75¢ per contract. Run it at 43¢ and it is about 1.7¢. Now look at the right-hand column of the table again: the gaps between the raw Kalshi price and the fee-adjusted one are 1.7¢, 1.8¢, 1.4¢. That is not a coincidence and it is not a modelling artifact. That is the fee, and it is the entire margin.
Which produces the counterintuitive result on four of these five cards: a venue quoting a worse-looking line is the cheaper place to take the position, because it prices its margin into the line instead of charging it on top. Tyjae Spears at 3+ receptions is the cleanest illustration — Kalshi shows 51.5¢ against a book consensus of 53.5%, which reads like the exchange is handing you two cents. Net of the fee, Kalshi is 53.3¢ and ProphetX is 51.9¢. The two cents was the fee the whole time.
None of which is an argument against the exchange. It is an argument against comparing a raw exchange price to a raw book price, which is comparing two different numbers and calling it line shopping. If you want to run the arithmetic on your own strike, the Kalshi fee calculator is free.
The five
01 · Trevor Lawrence, 2+ passing touchdowns at Denver — YES 43¢. Kalshi mid 42.5¢, bid 40 / ask 45 — a five-cent spread, which is wide, so the mid flatters it. The interesting feature is that no retail board we track posts this market at all. There is no consensus, no shopping, no second opinion. That cuts both ways: nothing is confirming the price, and nothing is competing it down either. A market nobody else quotes is a market where your own number is the only discipline you have.
02 · Kenneth Walker, 90+ rushing yards vs. Indianapolis — YES 41¢. Kalshi mid 40.5¢, bid 39 / ask 42 — tight, and the market has real size behind it. Walker's first season in Kansas City puts a genuine workload back in an offense that had been committee-ing it, and 90 is a number he clears when the game script cooperates. BetRivers at 41.2¢ is the cheapest entry; Kalshi comes to 42.7¢ once the fee lands.
03 · Tyjae Spears, 3+ receptions vs. Philadelphia — YES 52¢. Kalshi mid 51.5¢ against a book consensus of 53.5%. The fee example above. ProphetX 51.9¢ is the number.
04 · CeeDee Lamb, 6+ receptions vs. Washington — NO 46¢. The only fade on the card, and the one where the exchange and the books agree almost exactly: Kalshi has YES at 54.5¢, the books imply 54.6%. When a market is that tightly agreed, you are not taking a position on a mispricing — you are taking a position on the event, at a fair price, and the only thing left to optimize is the cost of getting in. ProphetX 46.5¢ against 47.7¢ net of fee on Kalshi.
05 · Wan'Dale Robinson, 5+ receptions vs. Philadelphia — YES 43¢. Kalshi mid 43¢, books imply 44.1%. His first year in Tennessee has him running a target share that the 5-reception rung has not fully caught up to. ProphetX 43.7¢.
Two of the five come out of the same game, Philadelphia at Tennessee. Worth saying plainly: those two are correlated. If the Titans are throwing underneath all afternoon, Spears and Robinson hit together, and if Philadelphia controls the game they miss together. Sizing them as two independent positions overstates your diversification.
What the board actually is
The five cards are a highlight reel. The thing underneath them is 3,613 Kalshi prop strikes for this week's slate, each one priced against DraftKings, FanDuel, BetRivers, Novig, ProphetX and ESPNBet wherever those venues post the same market — roughly 1,500 with a real two-sided book behind them.
Every row carries the same three things the cards do: the exchange price, what the books imply, and which venue is cheapest on that side after the fee. No account, no key, no wall — the whole board is at /nfl/props.
If you want to turn any of these into a position size rather than an opinion, the EV calculator and the probability converter are free too. And if the mechanics of a contract that trades between 1¢ and 99¢ are new to you, start with how prediction markets work.
Prices move. Do your own work.
Prediction markets are not sportsbooks. Kalshi is a CFTC-regulated exchange — contracts trade between 1¢ and 99¢ as market-implied probabilities and settle on the real outcome. Everything here is analysis with a stated position attached, recorded at a stated price on a stated date. Nothing here is advice. Trade responsibly.