← All Market Grades
PolymarketMarket Grades by Belief SystemsBeta

Will Manchester United win the 2026-27 UEFA Champions League Championship?

Belief Systems Market Grade

C-

Moderate market quality

As of Oct 23, 2026 · C- since Oct 23, 2026Measured from Sep 23 to Oct 23, 2026

FLiquidity · Very weakB+Integrity · StrongUpdated daily

Under review for a possible upgrade since Oct 10, 2026. The review closes by Oct 24, 2026.

Grade limits apply: C+ from the weaker of liquidity and integrity, B+ from trading evidence.

Rates how well this market trades, from A+ (best) to F: how much you can trade near the price, and how many different traders take part. Not a forecast of the outcome.

Market status
Active
Under review
Possible upgradeSince Oct 10, 2026
Data
Current · 100% observed
Trading activity
Moderate trading activity · grade limit B+

Liquidity and integrity

The two measures behind the grade.

F

Liquidity

Very weak

How easily the market trades: the depth of buy and sell quotes, the cost of a typical trade, and how steadily trading happens.

F since Oct 23, 2026 · steady

B+

Integrity

Strong

How broad and orderly trading is: how many different traders take part, and how often quotes are missing, one-sided, or crossed.

It screens for concentrated trading. It is not proof that a market can’t be manipulated, since many accounts can belong to one trader.

B+ since Oct 23, 2026 · steady

Both are recalculated daily over the same 30-day period. The overall grade moves more slowly: a change has to hold before it counts.

Grade changes

Every change stays on the record, including corrected ones.

Oct 10, 2026
Review opened

Reason: overall measured quality · Open

Why it changed

The recorded trigger was a change in the combined liquidity and integrity assessment. A review does not by itself change the grade.

Dates and identifier
Review began Oct 10, 2026 · data through Oct 10, 2026Took effect Oct 10, 2026 · published Oct 10, 2026Action identifier for API lookup: polymarket:0xabb68414dc31c89f672d88bf8e82e7f7117032958a86d5330382b74a1d812d90:1:6
Oct 8, 2026
Review closed

Reason: overall measured quality · Confirmed

Why it changed

The recorded trigger was a change in the combined liquidity and integrity assessment.

Dates and identifier
Review began Oct 7, 2026 · data through Oct 8, 2026Took effect Oct 8, 2026 · published Oct 8, 2026Action identifier for API lookup: polymarket:0xabb68414dc31c89f672d88bf8e82e7f7117032958a86d5330382b74a1d812d90:1:5
Oct 8, 2026
Upgrade

Reason: overall measured quality · Confirmed

Why it changed

The recorded trigger was a change in the combined liquidity and integrity assessment.

Dates and identifier
Review began Oct 7, 2026 · data through Oct 8, 2026Took effect Oct 8, 2026 · published Oct 8, 2026Action identifier for API lookup: polymarket:0xabb68414dc31c89f672d88bf8e82e7f7117032958a86d5330382b74a1d812d90:1:4
Oct 7, 2026
Review opened

Reason: overall measured quality · Open

Why it changed

The recorded trigger was a change in the combined liquidity and integrity assessment. A review does not by itself change the grade.

Dates and identifier
Review began Oct 7, 2026 · data through Oct 7, 2026Took effect Oct 7, 2026 · published Oct 7, 2026Action identifier for API lookup: polymarket:0xabb68414dc31c89f672d88bf8e82e7f7117032958a86d5330382b74a1d812d90:1:3
Sep 16, 2026
Record opened

Reason: a change in market status · Confirmed

Details

The market’s grading status changed under the methodology’s lifecycle rules.

Dates and identifier
Review start not recorded · data through Sep 16, 2026Took effect Sep 16, 2026 · published Sep 16, 2026Action identifier for API lookup: polymarket:0xabb68414dc31c89f672d88bf8e82e7f7117032958a86d5330382b74a1d812d90:1:1
Details and citationShow

The grade

Market status
ActiveCurrent grade, reviewed daily.
Under review
Possible upgrade, since Oct 10, 2026
Data status
CurrentEnough data was observed.
Grade limits
C+ from weaker component (in force)B+ from trading evidence (in force)
Trading activity
Moderate trading activity (T1)Trading activity met the middle evidence threshold over the observation period. A B+ grade limit from trading evidence is on this record.
Grade since
Oct 23, 2026

The data

Data observed
Full · 100%
Days observed
30 of 30 needed
Measured over
Sep 23 to Oct 23, 2026
First observed
Aug 17, 2026
Last complete day
Oct 23, 2026
Data check codes
None

Identifiers and versions

Record ID
polymarket:0xabb68414dc31c89f672d88bf8e82e7f7117032958a86d5330382b74a1d812d90:1A change to what the market question means starts a new record.
Venue
Polymarket
Market ID
0xabb68414dc31c89f672d88bf8e82e7f7117032958a86d5330382b74a1d812d90
Correction
Original
Calculation status
candidate
Last confirmed change
View it in grade changes
Methodology version
mg-1.2
Calibration version
mg-cal-1.0

Cite this grade

Market Grades by Belief Systems: Will Manchester United win the 2026-27 UEFA Champions League Championship? Market Grade C-.

Episode:
polymarket:0xabb68414dc31c89f672d88bf8e82e7f7117032958a86d5330382b74a1d812d90:1
Flags:
none
Lifecycle:
Active
Data status:
Current
Under review:
Possible upgrade since 2026-10-10
Trading activity:
Moderate trading activity (T1) · grade limits C+ (weaker component), B+ (trading evidence)
Book coverage:
full · 100%
As of:
2026-10-23 · window 2026-09-23 to 2026-10-23
Versions:
mg-1.2 / mg-cal-1.0

https://beliefsystems.xyz/grades/polymarket/0xabb68414dc31c89f672d88bf8e82e7f7117032958a86d5330382b74a1d812d90

How grades are calculated ↗

Market Grades are in beta. Grades are live, and the methodology is being validated in public on a published schedule. Validation roadmap ↗

Disclosures

Market Grades measure market quality – liquidity, integrity – not the likelihood of any outcome.

Market Grades are unsolicited: no graded party requests, pays for, or previews a grade. Belief Systems holds no positions in graded markets.

A grade is not a recommendation to buy, sell, or hold any position, and is not a substitute for a user's own assessment.