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What are prediction markets? How Polymarket turns opinions into prices

Yes/no shares, prices that read as probabilities, and a crypto-native settlement layer. How the markets we quote in our policy coverage actually work — and how Polymarket went from banned in America to a CFTC-regulated exchange.
BY PRIYA RAMAN·PUBLISHED {{ published }}·6 MIN READ
A price between $0.00 and $1.00 that reads as a probability — that's the whole trick.
Every market on Polymarket is a question with a deadline: Will the CLARITY Act become law in 2026? Will the Fed cut in September? You buy YES or NO shares, each paying out exactly $1 if you're right and nothing if you're wrong. That fixed payout is what makes the price meaningful: a YES share trading at 32 cents means the crowd — everyone with money in the market — collectively assigns the event roughly a 32% chance. Prices move the instant news breaks, because being slow costs traders real money.
Trades match between users, not against a house — the platform takes no side and earns fees, which is why a prediction market is structurally an exchange rather than a sportsbook. When the deadline passes, an oracle process checks the outcome against official sources and the winning side redeems at $1. Polymarket's international version was built on this crypto rail from the start — stablecoin collateral, on-chain settlement, a decentralized oracle — which is how a company founded in 2020 scaled from $73 million of volume in 2023 to about $9 billion in 2024, powered by an election it priced more confidently than the polls did.
The US story is messier, and instructive. In 2022 the CFTC fined Polymarket $1.4 million for operating an unregistered exchange and banned it from serving Americans. The road back ran through Washington rather than around it: federal probes closed without charges in mid-2025, the company bought a CFTC-licensed exchange for $112 million, and in December 2025 relaunched as Polymarket US — a regulated Designated Contract Market, the same tier as the CME. When the waitlist lifted in May, US volume ran from about $50 million a day to more than $200 million within five weeks, and the company says annualized revenue has passed $1 billion. Intercontinental Exchange — owner of the NYSE — committed up to $2 billion to the company last fall and now distributes its odds data to institutions.
Why does a bitcoin site care? Because prediction markets are the sharpest instrument available for the questions that move bitcoin sideways: legislation, Fed decisions, election outcomes. Polls sample opinions; prediction markets sample conviction. When we report that traders price the CLARITY Act's chances at one-in-three, that number aggregates everyone willing to bet against it being wrong. The markets aren't oracles — thin contracts on niche questions get noisy, and volume concentrates in sports — but their track record against experts is strong enough that dismissing them costs you information.
The caveats are real: the industry's explosive growth — combined volumes passed $44 billion in 2025 and were running above $20 billion a month by early 2026 — has drawn accusations of "backdoor sports betting" from the gaming industry, scrutiny over influencer marketing, and awkward questions about the offshore platform Americans still find their way onto. Treat the odds as a data feed, not a slot machine: the same discipline we'd urge for any speculative position applies double to markets that resolve to zero.
BITCOIN ALMANACK ANALYSIS
Anatomy of one contract
"CLARITY Act signed into law by Dec 31, 2026?"
BUY YES

32¢

PAYS $1.00 IF SIGNED
BUY NO

68¢

PAYS $1.00 IF NOT
IMPLIED: 32% YES68% NO
Prices as of July 17 · YES + NO always sum to ~$1.00 · Chart: Bitcoin Almanack
WHY IT MATTERS
Bitcoin's price increasingly moves on policy — ETF approvals, legislation, Fed decisions — and prediction markets are the only continuously updated, money-backed forecast of those events. Learning to read them is like learning to read the fee market or the futures curve: one more instrument that tells you what informed money actually expects, before the press release.

Frequently asked questions

How does a price become a probability?

Each share pays $1 if you're right. If YES costs 32 cents, the crowd is pricing a ~32% chance — pay $0.32 to win $1.00. If you think the true odds are higher, the trade is profitable in expectation, and your buying pushes the price toward your estimate.

Is Polymarket legal in the US?

Yes — through Polymarket US, a CFTC-regulated Designated Contract Market relaunched in December 2025, waitlist-free since May 2026 (app only, no desktop). The separate international crypto platform remains off-limits to US users.

Do prediction markets use bitcoin?

Mostly no — the international platform settles in dollar stablecoins on a blockchain, and the US exchange is a conventional regulated venue. The kinship with bitcoin is philosophical: open markets, on-chain settlement, and prices nobody can editorialize.
SOURCES & DATA
Volume and revenue figures are company- and press-reported, as of mid-July 2026. See our editorial process.
TERMS IN THIS STORY: prediction market blockchain CLARITY Act
Priya Raman
Payments & Adoption Reporter. Covers where bitcoin meets everyday money — apps, rails, and the platforms bringing new users in.
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