QUICK ANSWER
What is Onside Arena?
Onside Arena is an AI football analytics platform covering both Fantasy Premier League and the FIFA World Cup 2026. The engine is trained on 12 past World Cups + 8 Premier League seasons and validated cross-season out-of-sample at MAE 0.86 against the FPL community baseline. Onside surfaces captain shortlists, differential picks, value plays and per-fixture probabilities — refreshed after every played match.
Onside.
Fantasy intelligence · EPL 2025/26
● LIVE · DAY 23 OF 3948 NATIONS · 104 MATCHES
WORLD CUP2026
🇺🇸🇨🇦🇲🇽Live scores · model receipts · every PL star in an international shirt.
OPEN THE LIVE HUB →READ FIRST · WC 2026 MATCHDAY 1 LIVE
The four pages every fantasy manager opens this week
WIN PROBABILITY
Who Will Win the World Cup 2026?
10k Monte Carlo · live champion odds
CAPTAIN PICK
AI captain — who to captain this MD
Top 7 ranked · hourly refresh
IS [PLAYER] IN?
Every WC 2026 player squad page
~200 stars · fixtures + fantasy value
FPL 26/27
Best FPL Team 2026/27 — AI-Picked
Squad + captain rotation guide
v0.5 · v5 meta-stacker · 51,518 OOS predictions · MAE 0.86
A coach,
— not a calculator.
Onside is a premium AI companion for Fantasy Premier League. A 5-engine prediction stack with TreeSHAP explanations, a MILP squad optimiser, live in-gameweek tracking, a Claude-powered AI Coach, and a methodology we publish openly.
Get started · 30 seconds
Connect your team.
Why trust the numbers
Validated against two full seasons.
Our v5 meta-stacker (depth-2 GBT over our v2 closed-form, FPL ep_next, ICT signals, bookmaker odds, and Premier Injuries scrape) closes the gap to FPL's own xP — while exposing TreeSHAP explanations FPL doesn't give. Cross-season validated on 51,518 player-predictions. See the dashboard.
MAE OOS
0.86
v5 cross-season
-13.6%
vs v2
meta-stacker gain
17 features
depth 2
per-position GBT
Predictions
51.5k
across 2 seasons
What Onside does
Ten tabs. One question — every week.
🧠
AI Coach
AI agent grounded on your live squad. Three personas (analyst / maverick / dogged). Cites the data.
🎯
Squad Builder
MILP optimiser builds the maximum-xP 15 subject to budget, formation and 3-per-club rules. Or optimises transfers from your current squad accounting for −4 hits.
📈
xPts engine v2
Bayesian xMins + per-team attacking shape + BPS bonus + set-piece premium. Beats every naive baseline; calibration published.
⚽
Set-piece map
Curated weekly: penalty / FK / corner takers for all 20 EPL clubs with permanence scores. Wired into projections.
🗓
Multi-week Planner
Conservative / Balanced / Aggressive scenarios with chip optimiser (WC / TC / BB / FH) ranked by EV.
🏆
League intelligence
Real captain map across your league, hits/chips played aggregator, classifies your league as aggressive/balanced/patient.
📡
Buzz feed
PL official + BBC + Sky RSS, filtered by player-mention NER to your owned players. Pure signal.
📖
Squad Story
Auto-generated weekly recap: hero, captain verdict, bench audit, decision review. Share cards ready for socials.
🔬
Open methodology
Whitepaper, backtest dashboard, reproducible scripts. We publish what we project — and how accurate it was.
Ready?
Stop guessing. Start ranking.
Free tier includes the full v2 engine. Paid unlocks the squad optimiser + unlimited Coach.
Explore
This week
GW38 Captain Picks
Fixtures
Fixture Difficulty Ratings
Summer window
FPL Transfer News
Planning
DGW / BGW Tracker
Injuries
Player Availability
New to FPL?
Beginner's Guide
Strategy
FPL Strategy Guides
Strategy
Chip Strategy Guide
How it works
Methodology & xG Model
Pre-season
GW1 Tips 2026/27
Strategy
Chip Order 2026/27
Strategy
Budget Building
Mechanics
Bonus Points Explained
June 11 · Tournament
World Cup 2026 Hub
June 19
2026/27 Fixtures Hub
Pre-season
Best Start 2026/27
Season review
2025/26 Team of Season
Weekly digest
Captain picks, transfer tips & differentials — every week.
One email per gameweek. Unsubscribe any time.