You may have seen the name pop up during the last US election, or spotted it mentioned alongside a major news event. Polymarket is one of the fastest-growing platforms on the internet and it is doing something that sounds simple but turns out to be quite fascinating: letting anyone in the world bet on whether something is going to happen.
Start From the Beginning: What Actually Is It?
Polymarket is a prediction market. That means it is a place where people trade on the outcomes of real-world events rather than company shares or currencies.
The questions it hosts sound like the kind of thing you might argue about in a pub. Will there be a ceasefire before the end of the year? Will this film win the Oscar? Will this athlete retire by summer? Who will win the next election?
The difference between Polymarket and a pub argument is that on Polymarket, everyone has to put their money where their mouth is. You buy shares in a yes or no outcome. If you are right when the event resolves, your shares pay out at a dollar each. If you are wrong, they pay out nothing. The price of those shares at any given moment represents what the crowd collectively believes the probability of that event is.
So if a question asks “Will this happen?” and the shares are trading at 70 cents, the market is saying there is roughly a 70 per cent chance it will. No pundit, no expert, no poll. Just a live, constantly updating number based on real people risking real money.
Who Built This and Why?
Polymarket was founded in June 2020 by Shayne Coplan, a 22-year-old computer science student who had dropped out of New York University to pursue cryptocurrency projects full time. He built the first version of the platform in the bathroom of his Lower East Side apartment during the pandemic lockdown.
His motivations were not purely financial. Coplan had become frustrated by the spread of misinformation during the early COVID-19 period, particularly around recovery timelines and government policy.
He believed that if you forced people to actually back their predictions with money, the collective result would be more accurate than any single expert's opinion, any newspaper's take, or any polling firm's model.
He was not wrong. The platform launched just before the 2020 US presidential election and quickly demonstrated that crowd-sourced, financially incentivised prediction markets could track real-world probabilities more accurately and more nimbly than almost anything else available.
In October 2020, Polymarket raised $4 million in seed funding, backed by some of the biggest names in the crypto world.
By the time the 2024 US election came around, it was processing billions of dollars in trading volume and being cited by mainstream news organisations worldwide as a more reliable real-time guide to the race than traditional polling.
How Does the Money Side Actually Work?
Polymarket runs on the Polygon blockchain and uses a cryptocurrency called USDC, which is a stablecoin pegged directly to the US dollar.
For most practical purposes, one USDC equals one dollar. This matters because it removes the volatility problem that makes some crypto projects confusing. You are not betting in an asset that could halve in value overnight.
To get started, you connect a digital wallet to the platform, deposit USDC, and then buy shares in whichever market interests you.
Shares are priced between zero and one dollar. A share in a “yes” outcome trading at 30 cents means the market thinks there is roughly a 30 per cent chance of that thing happening. If it does happen, your share becomes worth a dollar. If it does not, it becomes worth nothing.
You do not have to hold until the event resolves. You can buy and sell shares throughout the life of a market, in exactly the same way you might trade a financial instrument.
If you buy a yes share at 30 cents and the probability shifts to 60 cents, you can sell and take your profit without waiting for the event to conclude.
Did It Ever Get Into Trouble?
Yes, and briefly in a serious way.
In January 2022, the US Commodity Futures Trading Commission charged Polymarket with operating unregistered event-based binary options markets and handed it a $1.4 million fine. The platform was required to block US users from that point forward.
That might have finished a smaller operation. Instead, Coplan took it as an opportunity to build a regulatory strategy rather than retreat from one.
He assembled a legal and policy team, continued operating internationally, and began the process of obtaining the licences that would eventually allow a US return.
In July 2025, Polymarket acquired a CFTC-licensed exchange and clearinghouse for $112 million, giving it the regulated infrastructure it needed. In November 2025, the CFTC formally approved Polymarket as a designated contract market, allowing American users back onto the platform under a verified, regulated structure called Polymarket US.
Shortly before that, Intercontinental Exchange, the parent company of the New York Stock Exchange, led a $2 billion investment round in the platform, valuing it at $9 billion. The organisation that runs the world's most famous stock exchange had decided prediction markets were worth serious money.
How Big Has It Actually Got?
The growth numbers are striking. Monthly trading volume on Polymarket was $38.9 million in April 2024. By November 2024, during the US election, it hit $2.58 billion in a single month. By February 2026 it had reached a record $7 billion in a single month, and The Crypto Times reports the platform had processed over $62 billion in cumulative trading volume by early 2026.
Monthly active traders went from around 41,000 in mid-2024 to over 760,000 by late 2025.
The platform now covers politics, horse racing, finance, entertainment, geopolitics and weather. Its data has been integrated into Bloomberg and Reuters terminals, and it is increasingly cited by journalists and analysts as a source of real-time probability information rather than simply a betting site.
Is It Legal to Use in the UK?
This is where it gets slightly complicated. Polymarket operates in a legal grey area in several jurisdictions, including parts of Europe.
The platform classifies itself as a financial trading market rather than a gambling site, which determines how different countries treat it. UK users have been able to access the global version of the platform, though the regulatory picture continues to evolve as prediction markets attract greater scrutiny worldwide. It is always worth checking the current position before depositing any money.
The Bottom Line
Polymarket is not a bookmaker, a polling company, or a news outlet, but it borrows a little from all three.
It is a real-time probability engine powered by the collective judgement of hundreds of thousands of people who are willing to back their opinions with actual money. As information tools go, that turns out to be quite a powerful one.
Whether you want to trade on it, follow it as a news supplement, or simply understand why people keep mentioning it, the core idea is not complicated. The crowd, when it has skin in the game, tends to get things right.
