If you came here on an NFL Sunday looking to buy a receiving-yards contract, start with the part nobody writes down.
Polymarket player props exist on two boards, and only one of them takes American money. Polymarket US, the regulated app, builds player markets around marquee games. The global site at polymarket.com lists season-long player lines that US residents can view but not trade. Each prop is a Yes or No contract priced from 1 to 99 cents, and a winner pays $1.
Everything below is the settlement rule, because that is the part that costs people money — not the price.
What Is Actually On The Board
Checked against Polymarket's public Gamma API on Sunday, September 20, 2026: the global board carried no single-game NFL player props at all. Game pages listed spreads, totals and team totals. Panthers-Falcons, Steelers-Patriots over/under 41.5, Baltimore −8.5. Player markets on that board were season-long lines, not Sunday props.
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That is the honest answer to the question most people are typing, and it changes week to week. If the Polymarket US app is showing a single-game prop for the slate in front of you, trade that one. Do not assume the global site has the same market — most Sundays it does not.
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The Rule That Costs People Money
At a sportsbook, a player who is scratched gives you your money back. The bet voids. You go make another one.
Polymarket does not void. A player who never takes the field settles at the last fair market price — whatever the market decided the contract was worth when it closed, split between Yes and No holders. Not a refund. Not a zero. A price.
That is better than it sounds. If your Over was trading at 45 cents when the inactive list came out, you get something back near 45 cents rather than nothing. It is also worse than it sounds, because you no longer control the exit.
The One-Snap Trap
Here is the line that matters, and it is the whole reason this page exists.
The safety net disappears the instant the player participates. One snap in football — or whatever counts as participation under that market's rules text in any other sport — and the last-fair-market-price protection is gone. The box score becomes the entire answer. The contract settles at $1 or at $0, and there is no middle.
So the worst outcome on a Polymarket player prop is not a scratch. A scratch pays you something. The worst outcome is a player who is questionable, gets announced as active, takes three snaps, aggravates the hamstring, and walks off. He participated. Your Over on 45.5 receiving yards settles on 6 yards, which is zero.
"He'll give it a go" is the most expensive sentence in the injury report.
One Hamstring, Three Endings
Same player, same 45.5-yard Over bought at 45 cents, three ways the Sunday goes:
| What happens | How it settles | What you get on 100 contracts |
|---|---|---|
| Ruled out, never dresses | Last fair market price | About $45 back — roughly what the market said it was worth |
| Active, three snaps, walks off | Box score. 6 yards is not 45.5 | $0 |
| Active, plays through it, 61 yards | Box score. Over hits | $100 |
Illustrative walkthrough at a 45-cent entry, not a live quote. The middle row is the one people do not price in, and it is the reason a questionable tag is worse for you than an out tag.
Read those three rows again. The scratch — the outcome that feels like the disaster — is the one that pays you back. The outcome that looks like a break, your guy being cleared to play, is the one that can take the whole ticket.
What It Costs To Trade
Polymarket US changed its fee schedule at 12 a.m. ET on Thursday, September 17, 2026, and the numbers went up. If you read an older guide, including an older version of this page, the math you were given is stale.
Taker fee = 0.0695 × contracts × price × (1 − price).
| Price you take | Taker fee per 100 | What that is per contract |
|---|---|---|
| 21¢ | $1.15 | 1.15¢ |
| 40¢ | $1.67 | 1.67¢ |
| 50¢ | $1.74 | 1.74¢ — the peak |
| 80¢ | $1.11 | 1.11¢ |
The fee is largest at a coin flip and shrinks toward both extremes, which is the same shape every exchange in this business uses. Post a resting order instead of hitting one and you are on the other side of it: the maker coefficient is −0.0125, worth about 31 cents back per 100 contracts at the midpoint.
Polymarket Or Kalshi For A Player Prop
Both exchanges charge on the same curve. Kalshi's taker rate is 0.07 × price × (1 − price), which at 40 cents is $1.68 per 100 against Polymarket US at $1.67. That difference is noise.
What should decide it is which board actually has the market, and on a single-game NFL prop this season that has usually been Kalshi — their touchdown board alone carries most of the NFL prop volume on any exchange. Check both, take the one with a real two-sided quote, and let the penny of fee difference go.
The Injury Routine
Four habits, and they are the entire defense against the one-snap rule.
Read the report before you buy, not after. A questionable tag on a player whose prop you already own is a problem. A questionable tag before you buy is information.
Assume the price already knows. Beat writers post to the same timeline the market watches. If a price moved eight cents before you heard anything, the news is in the number and you are the last to know.
Treat "he'll give it a go" as a red flag, not a green one. It is the exact setup for a player who participates, produces nothing, and settles you at zero.
Size it like a prop with a trapdoor. Quarter units. Being right about the player does not make you right about the ticket.
Final Thoughts
Polymarket player props price the way you expect and settle the way you do not, which is the only sentence on this page you have to remember.
A man who never plays hands you back roughly what the market thought your contract was worth. A man who plays one snap hands you the box score, and the box score does not care that he was hurt. Everything else on this page is detail. That is the rule.
Before you buy one, do two things: confirm the market actually exists on the board you can trade, and read the rules text on that specific contract for what counts as participation. It is not always a snap, and it is not always obvious.
Fee figures are from Polymarket's published US fee schedule effective September 17, 2026, and Kalshi's published taker rate, both read September 20, 2026; confirm the current rate before trading. Board availability was checked against Polymarket's public Gamma API on September 20, 2026 and changes week to week. Settlement examples are illustrative walkthroughs, not live quotes or positions of ours. Nothing here is financial advice. If you or someone you know has a gambling problem, call 1-800-GAMBLER.
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