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Bank of Japan Decision in September?
Financials
polymarket
predict

Bank of Japan Decision in September?

Jun 17, 2026, 7:32 PM EST - Sep 18, 2026, 11:59 AM EST
Total volume:
$337,435
Volume 24h:
$3,445
32%
Liquidity:
$146,660
17%
Open interest:
$64,742N/A

25 bps increase

all

2 markets

Predict

90%

Polymarket

87%

consensus

88.5%

+0%

spread

87-90%

(3pp)

News

Positive

Negative

Neutral

Hover marker for details

70%75%80%85%90%95%

Aug 15

Aug 17

Aug 18

Aug 19

Aug 20

Aug 21

Aug 22

Vol.

$24.3k

·

Resolves Sep 18, 2026

Time left: 26d:21h:47m

Will the Bank of Japan announce a 25 bps increase at the September 2026 meeting?

88%chance
Amount

$

Trade on
predict

Trade on Predict

At 90¢ buys you 111 shares | Odds: 88% Total Payout: $111 | Net Profit: $11 Multiplier: 1.11x | ROI: 11% | APY: 315% 26 days to resolution
polymarket

Trade on Polymarket

At 87¢ buys you 115 shares | Odds: 86% Total Payout: $115 | Net Profit: $15 Multiplier: 1.15x | ROI: 15% High Projected APY: 557% 26 days to resolution
You will be redirected to the platform to complete this trade.
Outcome
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Result

Description

This event group tracks whether the Bank of Japan will announce specific changes to the uncollateralized overnight call rate at its September 2026 meeting. The markets resolve based on official announcements from the Bank of Japan regarding policy rate adjustments.

PredictionHero - Resolution Divergence Alerts (RDA)

Unified Resolution Criteria (Consistent across platforms)

All platforms share identical resolution logic regarding measurement of basis point changes, rounding rules, and handling of meeting postponements/cancellationsPrimary resolution logic: Official Bank of Japan meeting statements and releases from September 17-18, 2026

Core resolution logic:

  • Change in basis points measured relative to the rate prior to the September 2026 meeting
  • Rounding rules: <25 bps changes round to 25 bps, >25 bps round to nearest 25 bps (away from zero)
  • Postponed meetings resolve based on rescheduled date; cancelled meetings resolve as "No Change"
  • Emergency rate changes outside the meeting are excluded

Edge cases & clarifications:

  • Partial meeting outcome: If only partial rate information is released (e.g., upper bound of a range), the change to the upper bound determines resolution
  • Exact 25 bps threshold: Changes of exactly 25 bps resolve as specified (no rounding needed)
Timing: Resolution occurs immediately after the official Bank of Japan releases the September 2026 meeting statement, typically on or shortly after September 18, 2026Our PredictionHero Resolution Divergence Alerts (RDA) are there to help users identify potential differences across platforms. They do not replace or supersede the official rules and description of any prediction market. Users are solely responsible for reviewing and understanding the applicable rules and resolution criteria before placing any trade or bet. If you notice a potential inconsistency, discrepancy, or error in an alert, please report it to our team so we can review and improve the accuracy of our data.
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Polymarket

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.

Predict

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

The dashboard for the BoJ September rate decision market aggregates real-time data from multiple prediction platforms, showing how traders price the likelihood of various monetary policy moves. It displays current probabilities, trading volume, and recent shifts in sentiment, allowing users to monitor market expectations for the Japanese central bank’s policy announcement. This consolidated view helps participants spot trends and compare expectations across venues, all centered on the same pivotal event.

On Polymarket and Predict, prices can vary due to differences in user bases, liquidity, and market design. Polymarket and Predict can show different implied probabilities for the same outcome because of liquidity, fee structure, participant mix, and how each venue defines the contract. For instance, one platform might attract more retail traders reacting quickly to news, while the other could see slower, institution-driven positioning. These dynamics create temporary mispricings, so Polymarket currently favors Will the Bank of Japan announce a 25 bps increase at the September 2026 meeting? at 86.0%, while Predict leans toward Will the Bank of Japan announce a 25 bps increase at the September 2026 meeting? at 87.5%.

This market resolves around Sep 18, 2026, with the outcome confirmed once the event is verifiable from credible public reporting. The final result hinges on the official announcement from the central bank regarding its policy decision that day. Traders watch closely for any surprise wording or forward guidance that could shift expectations even after the initial release.

Key drivers include upcoming economic data releases—such as inflation figures, employment reports, and GDP estimates—that influence expectations for policy tightening. Speeches from central bank officials can also shift probabilities, especially if they hint at upcoming moves. Global market volatility, currency movements, and major financial events may affect this market as traders reassess risk and policy paths in the weeks ahead.