Polymarket's 5-Minute Crypto Markets: What 'Time-Weighted' Actually Means
One word is doing a lot of damage in how people read these markets. When Polymarket's 5-minute crypto markets started making the rounds, the description that traveled with them said settlement is "time-weighted," and nearly everyone drew the same picture: the market must average the price across the whole five minutes. It does not. I checked the market rules and the resolution feeds directly on the exchange's own API, and the real mechanic is both smaller and more interesting than the phrase suggests. By the end of this page you will know exactly what those 30 seconds of weighting do, and why the venue question matters even more than the settlement question for anyone reading from the United States.
The Quick Answer
Polymarket's global exchange runs five-minute and 15-minute up/down markets on crypto assets including Bitcoin, Ethereum, XRP, Solana, and Dogecoin, and each one settles against a Chainlink oracle stream, not an exchange spot price. "Time-weighted" describes that oracle: a 5-minute market reads a stream smoothed over 30 seconds, a 15-minute market one smoothed over 60 seconds, which is manipulation resistance, not an average over the window. As of our scan of Polymarket US's full open-market catalog, these are listed on the global venue only, so US readers generally cannot fund an account to trade them; listings change, so check directly. The full settlement mechanics, the tenor-by-tenor numbers, and the two-venue detail behind that last sentence are all below.
What An Up Or Down Market Is
The instrument itself is as simple as this category gets. Each market asks one question: will the asset's price at the end of a short window be higher than it was at the start? You buy Up or you buy Down, the winning side settles at $1, the losing side at $0, and it is all done in five or 15 minutes. The tickers are stamped with the asset, the tenor, and a timestamp for the window they cover, so any individual market is dead within minutes of being born; what persists is the pattern: a fresh window every five minutes, around the clock. The same up-or-down family has run hourly windows before; the 5-minute and 15-minute tenors are the short end of the menu, and the fine print on how they settle is where this page earns its keep.
One structural note worth a beat, because most of the prediction markets we cover do not work this way. These are single binaries: one market, two sides, done. There is no ladder of strikes the way a temperature board stacks bands, no set of rungs whose prices have to be read together, and no overround baked across sibling markets. Ladder intuitions simply do not carry over here. A single binary is just a price and a probability, nothing more.
The simplicity is exactly why the settlement detail matters so much. When a market is a single question about a single price, the definition of "the price" is the entire contract.
What 'Time-Weighted' Actually Means
Here is the correction this page exists to make. The launch chatter, which spread mostly through @PolymarketTrade, a community account run by high-volume traders rather than an official Polymarket channel, described these markets as settling on a time-weighted price. Read cold, that sounds like the market resolves on an average computed across the entire window, the way certain exotic options settle on the mean price over their life. If that were true, it would change everything about how these markets should be priced, because an average over five minutes behaves very differently from a price at one instant.
That is not what happens. "Time-weighted" describes the oracle feed, not the market. Here is the actual rule text, verbatim from a live five-minute market: "This market will resolve to 'Up' if the time-weighted average price (TWAP) of XRP, generated by Chainlink, of the time range specified in the title is greater than or equal to the price at the beginning of that range." One clause in there, "of the time range specified in the title," is what trips people: read alone, it can sound like an average taken over the whole window. But the same rules then name the resolution source, and it is not a five-minute average of anything; it is Chainlink's dedicated XRP/USD TWAP stream smoothed over 30 seconds. The 15-minute markets name the matching 60-second stream. I pulled the resolution sources for the live markets on every asset listed, and every one points at these short-smoothing streams, which is the verified fact this page rests on.
| Market Window | Oracle it settles on | Smoothing as a share of the window |
|---|---|---|
| 5 Minutes | Chainlink TWAP, 30-second smoothing | roughly 10% |
| 15 Minutes | Chainlink TWAP, 60-second smoothing | roughly 6.7% |
The third column is a share of time, not of price: it says how much of the window the smoothing covers, not how far it can move the settlement print.
Sit with that middle column for a second, because it is the story. Thirty seconds of smoothing on a 300-second market is plumbing, not pricing. It exists so that nobody can shove a thin spot market around in the final second and flip the settlement print, which is precisely the fear people bring to short-tenor crypto markets everywhere. What it is not is partial settlement. The overwhelming majority of the window is still a straight race between the opening reading and the closing reading, and a reader who prices these as if the whole window were being averaged has the instrument wrong.
The one-line correction: "time-weighted" is a property of the Chainlink oracle these markets read, smoothed over 30 or 60 seconds as manipulation resistance. It is not an average computed across the market's own window, and it is not partial settlement.
Worth knowing, too, that up/down markets themselves are not new here. Earlier versions of these same markets resolved against Chainlink's plain price feeds; the move to dedicated TWAP streams is an upgrade to the resolution plumbing on an existing product, which is also why the search interest was already there.
A Worked Example: How A Window Actually Settles
The mechanics, stripped to the studs:
- When a window opens, the rules fix the reference point: the price at the beginning of the range, as reported by the resolution stream.
- For the length of the window, trading runs on the order book while the spot market does whatever it does; none of that path is averaged into the outcome.
- When the window closes, the market takes the oracle's reading at the end.
- Closing reading greater than or equal to the opening reference, the market resolves Up. Otherwise, Down. The winning side settles at $1, the losing side at $0.
The "or equal to" is straight from the market rules and is a real detail: an exact tie goes to Up, so the two sides are not perfectly symmetric even before anyone trades.
To make it concrete with illustrative numbers: say a five-minute XRP window opens with its reference price fixed at $2.4000. What decides the market is where the stream's 30-second-smoothed reading sits when the window closes. A closing reading of $2.4001 pays Up at $1. A reading of $2.4000 on the nose still pays Up. At $2.3999, Down pays. The smoothing only means the closing reading is a 30-second blend rather than a single tick, so a one-second spike at the buzzer moves the print far less than it would move a raw feed.
Because each side pays $1 or nothing, the price you pay is the probability you are buying: a 52-cent Up contract is a 52% implied chance, before fees and the spread, and those costs are the part of the cost picture most people skip. Over a five-minute horizon, be honest about how much better than a coin flip anyone's estimate can be.
Which Polymarket Carries These
Now the part I flagged at the top, and the one thing this page insists you take with you if you are reading from the United States. There are two Polymarkets, and they are separate companies with separate listings:
- The Global Exchange At Polymarket.com is where these five-minute and 15-minute crypto markets live; I verified the live listings there directly.
- Polymarket US is a distinct, CFTC-regulated operation with broad, state-specific availability under federal oversight. Our build-time scan of its full open-market catalog found longer-dated crypto price markets but nothing in the five-minute or 15-minute family. Listings change, so check Polymarket US directly before assuming either way.
The practical consequence is blunt. The global venue does not accept deposits from US users, and polymarket.com is effectively view-only from the United States, so "Polymarket has five-minute crypto markets" is true of a venue most American readers cannot fund.
The US reader check: before assuming any market on this page is available to you, confirm which Polymarket you are actually looking at. If a page or a post tells a US audience to go trade these without naming the venue, it was written from the announcement, not from the exchange.
Whether either venue is available to you specifically is a jurisdiction question, and our state-by-state guide to prediction market legality plus our honest read on Polymarket itself cover that ground properly. For how the two venues differ from Kalshi more broadly, the Kalshi vs. Polymarket comparison is the fuller treatment.
For US readers with a real short-tenor itch, the regulated version of this product exists on Kalshi, and we have already done the deep read on how Kalshi's 15-minute markets work. That page owns the Kalshi side of this subject, so I will not re-answer it here. For clarity, since we are naming both venues side by side: we have no affiliate or commercial relationship with Kalshi, and we do carry a sign-up offer for Polymarket US, disclosed where it appears below.
The Risk Shape Before You Touch Any Of This
Start with the risk that actually governs this instrument. A five-minute binary spends most of its life near the middle of the book, priced close to a coin flip, and the danger there is not one catastrophic loss; it is the meter. The market resets every five minutes, the spread and any fees are paid on every cycle, and the number of cycles you can run in an hour is the real bankroll question, a volume of cost no single trade's numbers will ever show you.
The classic asymmetry takes over the moment one of these prices away from the middle. Selling or fading an unlikely outcome collects a small premium and risks most of a dollar, and roughly speaking, one loss erases the premiums from about 15 wins. That asymmetry, not anyone's hit rate, is what makes sizing the entire game. The longer version of that argument is in our piece on selling long shots.
For transparency: Stokastic trades prediction markets, including Kalshi weather contracts, and holds positions in them; nothing here describes a position in this Polymarket product. The calls we publish elsewhere are graded against settlement once their markets resolve, but no performance figures belong on a permanent explainer like this. Nothing on this page is a pick, a play, or a recommendation to take a position, and these contracts can lose their full value.
Where To Go From Here
The announcement said "time-weighted" and the internet heard "averaged." The truth is 30 seconds of oracle smoothing on a five-minute race, an anti-manipulation detail on an upgraded product, listed on a venue US readers generally cannot fund. The practical mistake to avoid is pricing these like a five-minute average; the rules instead compare the window's opening reference with the closing reading. The order of operations for any short-tenor market, on any venue: confirm which venue you are on, then read the market's own resolution source, and only then think about a price.
For US readers who want to trade event contracts, Polymarket US is the venue built for that. To be clear about what you would be signing up for: its own listings, the markets our scan actually found there, and not the 5-minute crypto product this page just explained. We carry a sign-up offer for it, disclosed plainly right here: we may earn a commission if you sign up through our link. The current offer terms are "Deposit $10, get a $20 trading bonus," and our Polymarket sign-up bonus guide walks through exactly how it works.
New to Polymarket US? Sign up through our link, which installs the Polymarket US app with code OS4 built in: deposit $10, get a $20 trading bonus.
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18+ Only. Restrictions and eligibility requirements apply. Not available in all jurisdictions. Trading is risky. 100% loss can occur. See polymarket.com/tos for more information. The Polymarket US App serves as an independent software provider and affiliate of Polymarket US and Polymarket Clearing, the CFTC-regulated exchange and clearing organization.
And if what you actually liked about this page was the habit of checking the rules before trusting the headline: that habit is most of what OddsShopper sells. The site compares prices across 20+ sportsbooks and shows you what each bet really costs, the same way this page checked an oracle feed instead of a tweet. A free week of OddsShopper Pro, the 7-day free trial, lets you see all of it before paying anything, and code POLY5MIN20 takes 20% off OS Pro or OS Core if you subscribe.
For the event-contract world we cover day to day, our hub on how these markets work is rebuilt through the day.
We have no affiliate or commercial relationship with Kalshi. We do carry sign-up offers for some other prediction-market and betting platforms, including Polymarket US, disclosed above. Event contracts are risky, can lose their full value, and are for adults 18+ where available. Nothing here is trading, financial, or legal advice.
