Ethereum prediction markets

What the ETH 15-minute contract asks

Not where ether is going. When the window opens, Kalshi averages sixty one-second index prices for ether, and that average becomes the target. Fifteen minutes later it does the same. If the closing average is at least the opening one, the contract resolves yes, and a yes contract pays $1. Kalshi types that comparison as greater_or_equal, which is why a window ending dead flat resolves yes rather than no.

The event we pulled on 2026-09-20 was KXETH15M-26SEP201145, titled “ETH 15 min · $2,592.85 target”, strike date 15:45 UTC. That is the whole contract.

When the windows open and close

Every quarter hour: on the hour and at :15, :30 and :45, around the clock. ETH has no clock of its own. Every crypto event we fetched that day closed on the same quarter hour, so the ether window and the Bitcoin window expire in the same instant, and the next targets are set in that instant too. Watching two coins is one deadline with two lines on it, not two deadlines you can take in turn.

What settles it

A CF Benchmarks real-time index for ether, not the last trade on any one exchange. Sixty one-second index prices are collected in the final minute and averaged, and that average is the official closing value. Our chart draws Coinbase ETH-USD candles, and Coinbase is one of the exchanges feeding that index, so the two track closely without being the same number. Read the target off Kalshi.

An index average is not a last trade, so a one-second spike on one exchange in the final minute barely moves it, and a chart that looks decided can still settle the other way.

Trading ETH against BTC, in plain terms

The contract is the same shape on both coins: one target, fifteen minutes, $1 if yes. What changes is the scale. The ether target we saw was $2,592.85, while the Bitcoin targets we have seen sit in the tens of thousands. One percent of that ether target is about $26, so on ETH the distance between price and target is a small-looking dollar number at the same percentage gap. Judge it in percent, not in dollars.

Both targets carry two decimals, though for ETH we are reading that off the event title rather than a round_digits field, so treat it as implied. Fees are charged on the contract price, not the coin price, so the fee math is the same on both. We make no claim that either coin is easier to call, and we publish no graded record for either.

There is no ETH hourly desk

We run a Bitcoin hourly desk and no ether one. Kalshi’s series listing does carry an hourly ether series, KXETHD, on an ETHUSD real-time index, but we have not confirmed a live hourly ETH event the way we confirmed the 15-minute one. Until we watch one trade, there is no hourly page here.