Polymarket, Kalshi and Robinhood let users bet on the bitcoin price over fifteen minutes, and Polymarket even goes down to five. These "BTC Up or Down" contracts run day and night. According to Bloomberg's newsletter of 22 October 2026, they have pushed trading in crypto contracts on prediction markets to a record. Mechanics, fees, the share of bots and the status for a user in Switzerland: here is what the sources say.

How does a 15-minute bitcoin bet on Polymarket work?

The principle boils down to one question: will bitcoin end the window higher or lower? At the opening, the page displays a "price to beat", i.e. the bitcoin price at that moment. The bettor buys Up shares if they think this price will be matched or exceeded at the close, Down shares otherwise.

Each share costs between 0 and 1 dollar. It pays exactly 1 dollar if the prediction is right, nothing otherwise. An Up share priced at 73 cents means the market puts the chances of a rise at 73%. This implied probability moves with every order, right up to the last second.

The verdict depends on an external arbiter, the oracle. This service feeds market prices to the blockchain. Polymarket entrusts this role to Chainlink and its BTC/USD feed. Kalshi and Robinhood, whose contracts go through licensed exchanges such as KalshiEX, use the CF Benchmarks BRTI index, averaged over the last minute. In the quarter-hour format, a new window opens up to 96 times a day.

PlatformFormatsReference price
Polymarket5 and 15 minutesAverage price calculated by Chainlink: 30 seconds (5 min) or 60 seconds (15 min), since 7 August 2026
Kalshi15 minutesCF Benchmarks BRTI index, averaged over the last minute
Robinhood15 minutesCF Benchmarks BRTI index, averaged over the last minute

What volumes on these crypto prediction markets?

Growth has been rapid. Polymarket opened its first short crypto markets in September 2025, then the five-minute format in early February 2026. According to a Dune analysis published in April 2026, this format turned over around 2.3 billion dollars between 15 February and 30 March. The quarter-hour version totalled 795 million over the same period.

In mid-March, Bloomberg counted up to 60 million dollars traded on some days on these short bets. A bet on bitcoin's daily close often tops out below a million, Bloomberg notes.

What real chance of winning against bots and fees?

The occasional bettor is mostly up against programs. Dune attributes around 55% of the volume of five-minute markets and 62% of fifteen-minute ones to automated addresses. Occasional and regular traders account for only 4 to 5%. In one month, 6,189 bot addresses racked up some 56 million transactions in the five-minute format. The 43,898 occasional addresses made 166,000.

Fees then eat into every stake. Since January 2026, Polymarket has been charging takers, those who accept the displayed price, on these short-cycle markets. Its documentation gives the formula 0.07 × p × (1 – p) per share for the crypto category, p being the price paid. A share at 50 cents thus bears 1.75 cents in fees, or 3.5% of the stake.

The rate peaks when the outcome is most uncertain, precisely where the bet resembles a coin toss. With a share at 50 cents, you therefore need to guess right a little more often than one time in two just to cover your fees. According to Dune, these fast crypto markets earned Polymarket 17.8 million dollars in net fees between 7 January and 30 March 2026.

Nor is the displayed probability a guarantee of fairness. On 30 June 2026, David Dai and Ruizhe Jia (Stanford) and Shihao Yu (Singapore Management University) published a study of around 16,000 five-minute bitcoin contracts. They describe bursts of buying on Binance that tip the bet in the final seconds.

The authors attribute 8.2 million dollars in gains to 821 accounts, out of around 243,000 participants. They estimate that 93% of the losses hit retail investors. Manipulation is said to be "largely absent" from fifteen-minute contracts. Polymarket responded on 7 August 2026 by switching from an instantaneous price to an average price for resolution.

Who bets on bitcoin every five minutes?

A study by the insurer Northwestern Mutual, published on 9 March 2026, sheds light on the profile of the players. Nearly a third of 18-29 year-olds surveyed put, or are considering putting, money into sports betting and prediction markets. Eight in ten believe these risky vehicles will get them to their goals faster.

Jon Lourie, founder of the firm Polyfactual, described this speed as "addictive" to Bloomberg in March 2026. He does not rule out the arrival of one-minute markets. In the United States, these contracts fall under the Commodity Futures Trading Commission (CFTC), the federal derivatives regulator. In March 2026 it launched a public consultation on event contracts.

Is Polymarket authorised in Europe and Switzerland?

In France, the door is closed. The French gambling authority (Autorité nationale des jeux, ANJ) ordered internet service providers on 16 July 2026 to block Polymarket. It cites, among other things, the lack of identity verification for players. Polymarket filed an appeal on 21 August 2026, with no ruling announced since.

At European Union level, the comparison with binary options weighs heavily. Their sale to retail investors has been banned there since 2018. In its risk report of 10 September 2026, the European Securities and Markets Authority (ESMA) considers that Polymarket and Kalshi are selling their event contracts without the required European authorisation.

For Switzerland, the sources consulted give no position from any authority on these express bets. A Swiss user can nevertheless carry out a few checks, drawn from FINMA's publications:

  • consult the FINMA warning list, kept by the Swiss Financial Market Supervisory Authority: a listed name calls for caution, an absent name is not reassuring on its own;
  • look for the platform in the list of companies authorised by FINMA, and check which FINMA crypto licence its activity would require;
  • remember that a European Markets in Crypto-Assets (MiCA) licence applies to the European Economic Area, of which Switzerland is not a part.

FINMA can only act if it has territorial and substantive jurisdiction, and on concrete evidence. A foreign platform may therefore never appear on its list. The general framework is detailed on our page FINMA and cryptocurrencies.

What we don't know yet

  • The legal status of these contracts in Switzerland: none of the sources consulted says whether they are gambling, derivatives or something else.
  • The outcome of Polymarket's appeal against the block ordered in France.
  • The follow-up to the CFTC consultation on event contracts.
  • The effect of the average price, in place since 7 August 2026, on the manipulation described by the Stanford study.

Nor does an authorisation remove market risk. FINMA pointed this out when it authorised on 20 October 2026 the first Swiss bitcoin ETF open to the public: the capital invested can lose a significant part of its value. For those seeking exposure to the price itself rather than a bet, we have compared bitcoin held directly or via an ETP. This article is for information only: it is neither an incentive to bet nor investment advice.

Sources