How Prediction Markets Price the Fed: Reading Polymarket and Kalshi Odds

A prediction market prices the Fed's next decision as the live cost of a contract that pays one dollar if a given outcome happens, so a July hike trading at 20 cents means traders are paying 20 cents to win a dollar if the Fed raises rates. That price is read as a rough probability.

Prediction markets have become one of the fastest public readings of what a crowd expects from the Federal Reserve, alongside the futures-based CME FedWatch measure. This page explains how the contracts work, how to turn a price into an implied probability, where the numbers can mislead, and how Kresmion reads them across venues. It is descriptive throughout: it explains how the odds are read, not what to do with them.

What a prediction market is

A prediction market is a venue where people trade contracts tied to a future event. Each contract settles at one dollar if the event happens and zero if it does not. The live trading price therefore sits between zero and one dollar, and it is read as the market's implied probability of the event. A contract on a July Fed hike trading at 0.20 implies roughly a 20 percent chance in the eyes of the people betting.

The two venues most often cited for US rate decisions are Polymarket, which settles in a stablecoin and lists a separate contract for each possible Fed move, and Kalshi, a US regulated exchange that lists similar event contracts. Because each Fed meeting has several possible outcomes, a full picture reads every contract in the set at once: no change, a 25 basis point hike, a 25 basis point cut, and the larger moves.

How to read the odds

Three habits make the numbers useful.

First, read the whole set, not one contract. The outcomes for a single meeting should sum to about 100 percent. If a hold trades at 79.5 percent, a hike at 20.5 percent, and the cut contracts at a combined 0.7 percent, the set sums to roughly 100 and the shape is clear: the meeting is very likely to pass without a move, and what small tail risk exists sits on the hike side.

Second, watch the change, not just the level. A hold at 80 percent is unremarkable on its own. A hike contract that climbs from under 10 percent to 20 percent in a week is a repricing worth understanding, even if the base case never changed. The move is the information.

Third, weigh the volume behind the price. A contract with millions of dollars of trading is harder to push around than one with a few thousand. On a thin contract, a single large bet can move the headline number, so the dollar volume is part of reading the odds honestly.

A worked example

As of July 12, 2026, Polymarket's market on the July Federal Reserve decision priced a hold at 79.5 percent, a 25 basis point hike at 20.5 percent, and any cut at 0.7 percent combined, across about 50.3 million dollars of volume on the event. A week earlier, on July 5, the hike contract had traded near 9.7 percent. The base case, a hold, barely moved over that week. The tail is what changed, from small and roughly balanced to clearly hike leaning, with a hike priced at about 29 times a cut.

That is the kind of reading a prediction market gives that a single headline does not: not a forecast of the decision, but a live map of where a betting crowd places the risk around it.

How Kresmion reads prediction markets

Kresmion tracks Fed decision contracts across venues and stores the price history, so a move can be traced hour by hour rather than seen only as a snapshot. Two disciplines matter.

Prices are read live, from the venue, with the fetch time recorded. A stored value from days ago can sit unchanged on a page while the live market moves, so a figure that will be published is pulled fresh and timestamped.

Prediction market odds are treated as one source among several, not a verdict. When a futures-positioning reading, a bond market move, and a prediction market all lean the same way, the agreement is more informative than any one of them. When they disagree, that disagreement is itself worth stating. The deepest and most liquid rates market, the Treasury market, usually carries more weight than a prediction market measured in tens of millions.

The limits worth keeping in mind

A prediction market price is not a probability in any strict sense. It is the price at which bettors are currently willing to take each side, on a market that is small next to the instruments the Fed actually moves. Contracts can also carry their own resolution rules and fees that pull a price slightly away from a clean probability. And a thinly traded contract can be moved by one participant. None of this makes the readings useless. It means they are read as a crowd's live opinion, with the size and freshness of that crowd kept in view.

Key takeaways

Frequently asked questions

Are prediction markets accurate about the Fed?

They are one useful reading, not an oracle. They tend to track the consensus of other rate measures closely and update quickly, but they are small markets and can be noisy or moved by a single large trade. They are best read alongside futures-based measures and the Treasury market rather than on their own.

Why do the odds sometimes not add up to exactly 100 percent?

Each outcome trades as its own contract, and the separate prices only approximately sum to 100 because of bid-ask spreads, fees, and the fact that buyers and sellers meet at slightly different prices across contracts. A set that sums to 99 or 101 is normal; a set far from 100 is a sign to look closer.

Can one person move a prediction market?

On a thin contract, yes. A market with only a few thousand dollars of volume can have its headline price moved by one sizable bet. That is why the volume behind a contract is part of reading it, and why a sharp move on low volume is treated more cautiously than the same move on deep volume.

How is this different from the CME FedWatch tool?

CME FedWatch derives implied odds from federal funds futures prices, a large regulated market used mainly by institutions. Prediction markets like Polymarket and Kalshi derive odds from people directly trading event contracts. The two often agree; when they diverge, the deeper futures market usually carries more weight, and the gap itself is worth noting.

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Source: Kresmion prediction market data (Polymarket, July 2026 Federal Reserve decision market), live prices and price history fetched July 12, 2026. Contract mechanics per Polymarket and Kalshi public documentation. This page is information, not investment advice. Kresmion Research.