Dojima
Osaka · 1697 · the first futures exchange

Fifteen minutes.
Thirteen tickers.
One ranking.

Every round the chain ranks thirteen tokenized stocks by how far they moved. The top half takes the pot from the bottom half. Nobody reports the result: anyone can recompute any round from the same blocks.

Round closes in
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round—
leading now—
tickers in play—
Live round

Standing, this round

#TickerOpenNowMoveSide
reading the chain…
Tap a ticker to call this round. No wallet, no cost: the page keeps your record until the contract lands.
Your record

Calls you have made

Rounds called
0
Called right
0
Hit rate
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Streak
0

Prices are read from the Uniswap pools on Robinhood Chain with slot0, sampled at ten block heights inside the round. The average of the second half is compared with the average of the first: one tick at the close cannot move it.

Settled

The last four rounds

How it works

Three rules, no referee

1

Back a ticker

One of thirteen, before the round closes. Your pick is a transaction, so it is on the chain with a timestamp and cannot be changed afterwards.

2

The chain ranks them

At the close the thirteen are ordered by how far they moved inside the round. Ten samples, averaged across halves, taken at fixed block heights.

3

The top half is paid

Backers of the upper six split the pot of the lower six, in proportion to what they put in. The protocol takes its cut and buys back the token with it.

In 1697 Osaka merchants traded rice for future delivery at Dojima and settled against a price nobody owned. The same shape, fifteen minutes at a time, against pools nobody owns either.