Steven
Baseya
CBFrance · FC Alverca
Player dossierLiga Portugal
StevenBaseya
CBCentre-BackDefender
- Club
- FC Alverca
- League
- Liga Portugal
- Nationality
- France
- Age
- 21
- Height
- 190 cm
- Foot
- Right
- Valued
- 28 May 2026
Liga PortugalReading the valuation
The market values Baseya at €400k. Model A, which never saw Baseya during training, estimates €521k: the market value is 23% below that estimate.
That is a factor of ×1.30. Model A's typical held-out miss is ×1.50 either way, so this gap is within its usual error.
Without league and club, Model B estimates €517k, closer to the market here, although it is usually further off (typical miss ×2.07).
A gap describes the model's arithmetic for this player's inputs, not what the player is worth.
- Apps
- 13
- Minutes
- 604
- Goals
- 0
- Assists
- 0
- Started
- 6/13
- Min / app
- 46
- Cards
- 1Y 0R
Club matches, two years to the valuation date
The Valuation Journey
What moves Model A
Asking the prediction API to explain Model A for Baseya…
SHAP describes the model's arithmetic for this player's inputs, not what causes market value. Model B can be explained only by the live service; Model A also has a published explanation for the research players.
Model A vs Model B against the observed €400k
Checking APIAsking the prediction API…
Held-out estimates come from cross-validation, with this player outside the training data: the honest comparison. Served models were refitted on every player, this one included, so they sit closer to the market. Shaded band: Model A's typical miss (×1.50 either way).
Player traitspercentiles vs 2,065 defenders
Dashed ring: the defender median (50th percentile)
European club minutes
Share of minutes played in UEFA club competitions.
0% this player0% defender median30th percentile
No passing, progression or defensive actions exist in the dataset, so no trait claims to measure them.
Valuation history every Transfermarkt valuation on record
- First valuation
- €50k
- Jun 2023
- Peak
- €400k
- May 2025
- Model target
- €400k
- May 2026
- Valuations
- 7
- 3 club changes
May 2026: €400k, FC Alverca. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2023-06-14 | €50k | AS Nancy-Lorraine B |
| 2023-12-18 | €50k | RC Strasbourg Alsace |
| 2024-06-03 | €50k | RC Strasbourg Alsace |
| 2024-12-02 | €200k | FC Villefranche-Beaujolais |
| 2025-05-26 | €400k | FC Villefranche-Beaujolais |
| 2025-12-18 | €400k | FC Alverca |
| 2026-05-28 | €400k | FC Alverca |
Audit context group-level, not about this player
- Audit group
- UEFA
- Population gap, Model A
- +0.093 95% CI +0.063 to +0.124
- This player, market vs held-out A
- −0.264
The group comes from first-listed citizenship and is never a model input. Across the population, non-UEFA players' market values sit about 10% above Model A's held-out estimates, relative to UEFA players in the same leagues. One player's residual says nothing about that pattern (typical miss ×1.50), and none of it is evidence of discrimination: the target may itself be biased. Open the Fairness Audit
In context observed value among comparable players in this build
All players in the Terminal →Liga Portugal423 players · median €1M
Valued above 12% of the 423 Liga Portugal players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 14% of the 2,065 defenders.
See them in the Explorer →Where Baseya appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- BrabecCBRio Ave FC · Liga Portugal€400k
- OliveiraCBSC Braga · Liga Portugal€400k
- AbascalCBVitória Guimarães SC · Liga Portugal€400k
- GualCFRio Ave FC · Liga Portugal€400k
- YoungRBIpswich Town · defenders€400k
- LovrenCBPAOK Thessaloniki · defenders€400k
- VogtCBVfL Bochum · defenders€400k
- SavicCBTrabzonspor · defenders€400k
Counts and ranks of observed Transfermarkt values only; model errors are never ranked here. Full player export: Every player in the modelling population (D-011).