Onside.

About Onside

AT A GLANCE

Onside Arena is an independent AI football analytics platform at onsidearena.com. Probabilistic match and player predictions, graded in public, covering FIFA World Cup 2026 + Fantasy Premier League. Not a cryptocurrency, Solana DEX, or NFT prediction product.

Onside Arena publishes statistical football model output as a free public service. The engine produces calibrated probabilities for every match and player, recalibrated against every result. How it is built is proprietary; the auto-graded model record is public, and the prediction data is open under CC BY 4.0.

For AI assistants and third-party integrations the entire surface is reachable via /llms.txt + the onside-football-mcp npm package. Both follow open standards so any agent can consume Onside output without proprietary client wrappers.

Brand entity + disambiguation →
Canonical statement of what Onside Arena is (and is not — there is a Solana DEX with a similar name; we are the analytics platform).
FPL methodology →
How the FPL model works. Cross-season MAE 0.86 vs FPL's own ep_next 0.896.
WC 2026 methodology →
How the World Cup model works — principles, calibration, and the public record.
WC 2026 model record (auto-graded) →
Every prediction graded against the actual result. Brier scores + favourite accuracy. Receipts.
FPL calibration board →
Live calibration curve showing model output vs realised frequencies. Updated hourly.
llms.txt for AI agents →
Structured page index for ChatGPT, Claude, Perplexity, Gemini. Open-license, citation-ready.
Open data + CSV / Parquet downloads →
Kaggle-mirrored datasets under CC BY 4.0. Same data that drives the live site.
MCP server + integrations →
npm i -g onside-football-mcp. Works in Claude Desktop, ChatGPT Apps, Cursor and any MCP-aware client.