Will Illinois win the 2027 NCAA Men's Basketball National Championship?
4 of 5 top Polymarket traders hold No (80%) · No at 89¢ · $5K held · ends Apr 20, 2027
⚠️
Avoid
No
5
No 80%
$5.4K
-$40.78
90.3¢ → 88.5¢
-2% since entry · 3 traders
Research grade
AvoidNo at 89%
Matches a pattern that lost clearly more than the plain consensus in our tests.
- BasketballFull year, out of sample: basketball lost −4.8 % a trade (n 1,747, 95 % CI −9.2 to +0.3); Oct 22 backtest: −12.0 % and −9.2 % in its two windows.
- Favourite (60–95¢)Full year, out of sample: 0.70–0.90 lost −0.9 % a trade (n 26,050, 95 % CI −1.5 to −0.3): the least bad band, still a loss. The Oct 22 backtest's +0.4 % (n 4,327) was not confirmed.
The rules come from our Oct 22 2026 backtest (one entry per market, held to resolution, after a 1¢ half-spread and Polymarket's taker fees). Our full-year test without hindsight (Oct 26 2026) found none of them profitable out of sample, and the plain consensus lost −3.0 % a trade. The grade describes the market; it is not a forecast, not an edge and not advice.
Smart Money Signal
4 of 5 top traders (80%)1 holds an outcome priced under 50%3 small positions dimmed (<$100 invested)
Outcome Probabilities
Smart Money Breakdown by Outcome
Signal Intelligence
Momentum
Flat
+0 pts consensus
Breadth
4 traders
Top 2 hold 100%
Freshness
Mature
24h old
Flip Quality
Clean
0 consensus flips
80% of non-arb traders are on No. Concentration is driven by the top two positions owning 100% of that side's value.
| Trader | Position | Invested | Value | PnL | Record |
|---|---|---|---|---|---|
 Hyperlong | Noavg 90.4¢ | $5.2K | $5.2K | -$94.31 | 47% 320-364 (684) |
ND ndb1 | Noavg 89.4¢ | $161.27 | $164.09 | -$1.68 | 64% 1050-593 (1643) |
RA rainbowliliesCTR<$100 | Yesavg 1.1¢ | $5.68 | $45 | +$55.42 | 39% 2899-4496 (7395) |
0X 0x62D56a93516DB0181F7cDEa919191EC07Fa43D4F-1793322863179<$100 | No | $16.38 | $16.38 | +$0 | 24% 450-1390 (1840) |
PL plainfolder<$100 | Noavg 93¢ | $9.3 | $9.1 | -$0.2 | 31% 4440-9727 (14167) |
HyperlongInvested
$5,161.66
Value
$5.2K
PnL
-$94.31
Record
47%
320-364 (684)
Invested
$161.27
Value
$164.09
PnL
-$1.68
Record
64%
1050-593 (1643)
Invested
$5.68
Value
$45
PnL
+$55.42
Record
39%
2899-4496 (7395)
Invested
$16.38
Value
$16.38
PnL
+$0
Record
24%
450-1390 (1840)
Invested
$9.3
Value
$9.1
PnL
-$0.2
Record
31%
4440-9727 (14167)
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EV Calculator
Consensus % is how many tracked traders hold a side, not a win probability.
88.5¢ price + 1.0¢ spread + 0.5¢ fee (Sports 5%). Win more often than this and the bet pays.
A market order pays the taker fee and crosses the spread (assumed 1.0¢); a limit order pays no fee but may not fill. The fee category is a guess from the title.