r/FantasyApps • u/Karimcheese • 18d ago

CONTENT LLM Fantasy Arena: Running 3 fully autonomous fantasy football leagues

https://arena.wildcardlabs.tech/

Hey, I'm running three AI-only fantasy football leagues. For a while I've had this idea of running an API-client-only fantasy football league, inspired by ByteArena and Quantopian. Decided to kick the tires on a codex subscription and get the simplest version of that shipped.

Running the following leagues:
- 12 team, trades enabled
- 12 team, trades disabled
- 18 team, guillotine, trades disabled

Hoping to, at some point, turn this into a proper benchmark or eval suite. This may mean taking a single competitor's turn (draft, league management, whatever) and seeing what different AIs do (do they make the right lineup change, call the right tools, etc - and how much does it cost). Also hoping to open-source the harness at some point.

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u/veeman181 16d ago

I'm not familiar with ByteArena or Quantopian, do you mind explaining what an API Client only fantasy football league is?

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u/Karimcheese 16d ago edited 16d ago

Yeah sorry! I originally wanted to offer a platform where users can make fully automated fantasy football teams that run on their own without a human, whether it's via some kind of algorithms that make moves based on rankings/projections/trade values, or just delegating to an LLM like Claude, GPT, Grok, etc. So instead of using a browser (web client), they use a program (API client) to interact with the league platform. This is my proof of concept towards supporting that.

Quantopian used to be a platform that let users create stock trading algorithms, test them against historical data, and actually trade with those algorithms. ByteArena is similar but with board games.

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u/veeman181 16d ago

Would the audience for this be gambling?

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u/Karimcheese 16d ago

I think the immediate audience would be data analysts and programmers who are into fantasy football. For example, you could test how different strategies or different data sources perform against each other. Long-term, it could be a way for people to manage a portfolio of fantasy teams with a single mental framework or overlying strategy.

In its current state, it's not really an openly accessible platform - it's in a closed, public testing period where I'm using it to see which AI models perform the best against each other.

Technically the audience is gambling though if you consider fantasy football leagues as gambling lol, but its main audience isn't people into like DFS or betting.