MCP server
MLB data for AI agents, over MCP
FastballAPI is a hosted MCP server: one URL gives Claude, ChatGPT, Cursor or your own agent 18 read-only baseball data tools. 500 free credits, no card.
Connect in one step
Claude Code
claude mcp add --transport http fastballapi "https://mcp.fastballapi.com/mcp?key=YOUR_API_KEY"Claude Desktop, Cursor and other clients
{
"mcpServers": {
"fastballapi": {
"url": "https://mcp.fastballapi.com/mcp",
"headers": { "x-api-key": "YOUR_API_KEY" }
}
}
}In ChatGPT, add it as a custom connector (developer mode) with the server URL https://mcp.fastballapi.com/mcp?key=YOUR_API_KEY. Listing tools works without a key; calling one needs it.
Ask it things like
- “Who led MLB in RE24 last season among qualified hitters, and how does that list compare with OPS?”
- “Show every book's moneyline, run line and total for today's games, and the median line for each.”
- “Break down Tarik Skubal's pitch mix last season: usage, velocity and whiff rate for each pitch.”
- “Plot Aaron Judge's balls in play in 2024 by trajectory and field.”
18 tools
Credits per call. The same tools are REST endpoints; see the docs.
Team ids, abbreviations and colours for a season
Find players by name
Games with runs, hits and errors by season, date, range or team
Upcoming games with the median line across sportsbooks
Standings from every final game, with run differential and Pythagorean record
The latest injury report
Our team Elo ratings, ranked
One game: every batting and pitching line, each book's line, win probability
Season batting (AVG, OBP, SLG, OPS, RE24) and pitching (ERA, WHIP, K/9)
A player's full batting and pitching game log
Season leaders among qualified batters and pitchers
Runs for and against, team batting and opponents' batting
A pitcher's arsenal: usage, velocity, whiff rate per pitch type
Every sportsbook's moneyline, run line and total for a game (5) or a day (10)
Plate-appearance play-by-play with base-out state, batted ball, win probability, RE24
Pitch-by-pitch: count, type, velocity, location, result
Where a batter or team hits the ball, by trajectory and field
Daily snapshots of each sportsbook's line before first pitch
Questions
What is the FastballAPI MCP server?
A hosted Model Context Protocol server at https://mcp.fastballapi.com/mcp. Add that URL to Claude, ChatGPT, Cursor or any MCP client and the assistant can call 18 read-only baseball data tools directly: no scraping, no local install.
Do I need to run anything locally?
No. It is a remote server over Streamable HTTP. Your client connects to one URL and sends your API key as an x-api-key header or a ?key= parameter.
What does it cost?
Every account starts with 500 free credits and no card. Tools cost 1 to 10 credits a call, a call that returns no data is refunded, and plans start at $19/month for 10,000 credits.
Is it the same data as the REST API?
Yes. Every MCP tool is also a REST endpoint with the same arguments and response, so an agent prototype and production code read identical data.
Which clients work?
Anything that speaks MCP over Streamable HTTP: Claude Code, Claude Desktop, ChatGPT (connectors), Cursor, Cline, Windsurf and agent frameworks with an MCP client. It is also listed on the official MCP Registry, Smithery and Glama.