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Home / Markets / Bank of Japan Decision in September?
Resolved market scorecard

Bank of Japan Decision in September?: result and scorecard

Resolved 25 bps increase. One day before close Polymarket priced that outcome at 99.7%; a week before, 97.9%. $1.5M traded in total.

Updated 2026-11-06 03:05 UTC · Source: Polymarket · 18+ · Market prices, not predictions or advice

Result

25 bps increase
resolved September 18, 2026

Price 1 day before

99.7%
Market was confident and right

Price 7 days before

97.9%
30 days before: 83.5%

Volume

$1.5M
5 outcomes

BOJJapanWorldEconomyGlobal Rates

Final prices by outcome

OutcomeResultVolume
25 bps increaseWON$548K
50+ bps increaseLOST$503K
No changeLOST$392K
25 bps decreaseLOST$48K
50+ bps decreaseLOST$34K

Price history to resolution

0%25%50%75%100%06-1808-0309-18
25 bps increase50+ bps increaseNo change25 bps decrease
📱 Compare how the same event is priced across venues on Polymtrade.Referral link. 18+.

Scorecard

A market that prices the eventual outcome at 100% the day before is getting it right in the simplest sense, but a single market says little about calibration. Across many markets, outcomes priced at 70% should happen about 70% of the time. See the monthly scorecard for the aggregate record.

Resolution rules

This market will resolve according to the change in basis points in the uncollateralized overnight call rate resulting from the September 2026 meeting of the Bank of Japan, relative to the level it was prior to this meeting. The resolution source will be official information from the Bank of Japan, including the statement or release from its September 2026 meeting, scheduled for September 17-18, 2026, as listed on the official Bank of Japan calendar (https://www.boj.or.jp/en/mopo/mpmsche_minu/index.htm). This market may resolve as soon as the statement or release of the Bank of Japan’s September 2026 meeting with relevant data is issued. If the specified rate is defined by an upper and lower bound, the relevant change will be the change to the upper bound. If the specified rate is changed to a level not expressed in the displayed options, the change will be rounded according to the following guidelines. Increases or decreases of less than 25 bps will be rounded to 25 bps (e.g. an increase or decrease of 10 bps would be considered to be an increase or decrease of 25 bps). Increases or decreases of greater than 25 bps will be rounded to the nearest 25 bps and will be rounded away from 0 in cases of equidistance (e.g., an increase or decrease of 37.5 bps would be considered to be an increase or decrease of 50 bps). Displayed options of “Increase” or “Decrease” will include policy rate increases or decreases of any size. If the specified meeting is postponed to a date and time before the start of the next scheduled meeting, this market will resolve based on the outcome of that postponed meeting. If the specified meeting is cancelled, or postponed such that no decision is announced by the start of the next scheduled meeting, this market will resolve to the “No Change” bracket. Emergency changes to the specified rate not resulting from the specified meeting will not be considered.

Frequently asked questions

How did "Bank of Japan Decision in September?" resolve?
It resolved 25 bps increase around September 18, 2026.
What did the market predict?
Polymarket priced the winning outcome at 99.7% one day before close, 97.9% one week before and 83.5% one month before.
How much was traded?
$1.5M across 5 outcomes.

Related on BetG8

Data: Polymarket Gamma and CLOB APIs, fetched by BetG8 at the time shown above. Venues may restrict access by location. 18+ only.