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Read-only fantasy analysis for ESPN, Yahoo, and Sleeper leagues via MCP
About
Read-only fantasy analysis for ESPN, Yahoo, and Sleeper leagues via MCP
Remote endpoints: streamable-http: https://api.flaim.app/mcp
Security Report
This is a well-designed fantasy sports MCP server that connects to ESPN, Yahoo, and Sleeper APIs. The code demonstrates good security practices including proper authentication handling via Clerk, secure credential management, and appropriate permissions scoped to fantasy sports functionality. Minor findings relate to error handling patterns and dependency management, but do not significantly impact security. Supply chain analysis found 6 known vulnerabilities in dependencies.
4 files analyzed · 9 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Install & Connect
Available as Local & Remote
This plugin can run on your machine or connect to a hosted endpoint. during install.
Documentation
View on GitHubFrom the project's GitHub README.
Flaim Fantasy
Connect your ESPN, Yahoo, and Sleeper leagues, then use Flaim Fantasy in ChatGPT or Claude for read-only analysis grounded in your real league. Advanced users can also add Flaim manually as a custom connector in compatible AI platforms.
Analysis tools are read-only by design. No trades, no drops, no roster changes — just advice. League refresh can update Flaim's connected-league records so newly available seasons show up.
How It Works
The Flaim skill teaches your AI assistant how to behave like a fantasy analyst — which data to pull, how to interpret it, and how to turn it into useful advice. The MCP tools feed it your actual league data. Together, they give a general-purpose AI enough structure to answer like it knows your specific league.
Get Started
- Create your Flaim account at flaim.app.
- Connect your fantasy leagues — ESPN via Chrome extension, Yahoo via Yahoo sign-in, or Sleeper by username. Flaim discovers supported leagues and shows them in Your Leagues.
- Connect your AI app: Open Flaim Fantasy in ChatGPT or Claude, or follow the optional Perplexity custom-connector path in the connection docs. Public setup docs live at flaim.app/docs.
You are done. Ask questions such as "Who should I start this week?" or "What's on the waiver wire?" Defaults and additional league management are optional after setup.
The Skill
The Flaim skill teaches your AI assistant how to behave like a fantasy analyst — when to use which tools, how to interpret league data, and how to turn that context into useful advice.
Install for Claude Code (or any Agent Skills-compatible tool):
Place the skill in your project's .agents/skills/ directory (cross-platform convention) or in ~/.agents/skills/ for global use:
# Clone or copy the skill directory
cp -r flaim/.agents/skills/flaim-fantasy ~/.agents/skills/flaim-fantasy
The AI will detect and activate the skill automatically when you ask fantasy questions.
MCP Tools
| Tool | What it does |
|---|---|
get_user_session | Your leagues across all platforms |
refresh_leagues | Re-discover connected leagues and update Flaim's league records |
get_ancient_history | Past seasons and historical leagues outside the current season |
get_league_info | Baseline league context: settings, scoring, roster config, teams/owners |
get_roster | Team roster with player stats |
get_matchups | Weekly matchups and scores |
get_standings | League standings and rankings |
get_free_agents | Available players with a normalized envelope; ESPN/Yahoo include platform-wide ownership percentages, Sleeper returns identities only |
get_players | Player lookup; ESPN and Yahoo can add league ownership, Sleeper ownership is unavailable |
get_transactions | Recent adds, drops, waivers, and trades |
All tools connect through a single MCP endpoint: https://api.flaim.app/mcp
Supported Platforms
| Platform | Sports | Auth |
|---|---|---|
| ESPN | Football, Baseball, Basketball, Hockey | Chrome extension |
| Yahoo | Football, Baseball, Basketball, Hockey | OAuth 2.0 |
| Sleeper | Football, Basketball | Username (public API) |
Architecture
Chrome Extension → flaim.app → Auth Worker → Supabase
↓
ChatGPT / Claude / manual MCP clients → Fantasy MCP Gateway → ESPN/Yahoo/Sleeper Clients → Platform APIs
- Web App (Next.js on Vercel) — landing/site pages, public live demo, OAuth, league management
- MCP Gateway (Cloudflare Workers) — unified endpoint for all platforms and sports
- Platform Clients (Cloudflare Workers) — ESPN, Yahoo, Sleeper API normalization
- Auth Worker (Cloudflare) — token validation, rate limiting, credential storage
- Supabase — user data, OAuth tokens, credentials
About
Solo indie project — built with care, maintained for the long term. No VC funding, no growth pressure, just a useful tool for fantasy sports fans who use AI.
Development
git clone https://github.com/jdguggs10/flaim.git
cd flaim
corepack pnpm install
cp web/.env.example web/.env.local # add keys
corepack pnpm run dev
Root, web, and workers use pnpm via Corepack. The Chrome extension is intentionally npm-isolated under extension/ with its own lockfile and release flow.
| Document | Description |
|---|---|
| Architecture | System design, deployment, troubleshooting |
| Changelog | Release history |
| Connection Docs | ChatGPT and Claude links plus optional custom-connector guidance (public version: flaim.app/docs) |
| Web App | Next.js routes, components, environment |
| Workers | Cloudflare Workers, MCP tools, ESPN API |
| Extension | Chrome extension build, Sync Host, CWS |
Getting Help
Best-effort support — I'll respond when I can.
License
MIT License — see LICENSE.
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