FastballAPI MCP server

Name: FastballAPI
Author: noahowsh

The baseball data API. Pitch-by-pitch data with pitch type, velocity and location, every plate appearance with base-out state and the batted ball, box scores, standings, our own ratings and run values, sportsbook lines by book and MLB player prop lines. MLB since 2015 plus the NCAA Division I games ESPN carries. REST API and MCP server. 500 free credits every month, no card.

Website: https://fastballapi.com · Docs: https://fastballapi.com/docs · Get a key: https://fastballapi.com/signup

You:    "What is Gerrit Cole's whiff rate by pitch type this season?"
Claude: [calls get_pitch_mix]

You:    "How often did Aaron Judge homer on a 3-2 count in 2025?"
Claude: [calls get_plate_appearances]

You:    "How often has Shohei Ohtani gone over his total bases line since 2023?"
Claude: [calls get_prop_history]

Skills

This repo also ships 16 free Claude skills in skills/ that turn Claude into a baseball analyst: pitch mix and whiff rate, run value, spray charts, Pythagorean record, game previews, odds analysis, prop modeling (pitcher strikeouts, hits, total bases), edge detection and backtesting. Each skill names the FastballAPI tools it calls and what they cost.

bash

git clone https://github.com/noahowsh/fastballapi-mcp.git

Or install them as a Claude Code plugin:

/plugin marketplace add noahowsh/fastballapi-mcp
/plugin install fastballapi-skills@fastballapi

Or with the skills CLI: npx skills add noahowsh/fastballapi-mcp.

Point Claude at the skills/ folder, connect the MCP server below, and ask. The dispatch skill routes a request to the right two or three skills. Full list: skills/README.md.

Quick start

This is a hosted (remote) MCP server over Streamable HTTP. There is nothing to install.

Claude Code

bash

claude mcp add --transport http fastballapi "https://mcp.fastballapi.com/mcp?key=YOUR_API_KEY"

Claude Desktop, Cursor and other clients

json

{
  "mcpServers": {
    "fastballapi": {
      "url": "https://mcp.fastballapi.com/mcp?key=YOUR_API_KEY"
    }
  }
}

The key can also be sent as an x-api-key header or Authorization: Bearer. Connecting and listing tools works without a key; calling a tool needs one.

REST

bash

curl -X POST https://mcp.fastballapi.com/v1/list_teams -H "x-api-key: YOUR_API_KEY"

Every tool is POST /v1/{tool} with a JSON body.

Examples

Runnable Python (standard library only) and Node 18+ (no dependencies) examples live in examples/:

examples/python/quickstart.py and examples/node/quickstart.mjs: schedule plus a headline call.
examples/python/mlb_pitch_mix_and_props.py: A pitcher's arsenal (usage, velocity, whiff rate and ball rate per pitch type) followed by his strikeout prop lines against what he actually threw, game by game.

bash

export FASTBALLAPI_API_KEY=your_key
python3 examples/python/quickstart.py
node examples/node/quickstart.mjs

See examples/README.md for details. Get a free key (500 credits a month, no card) at https://fastballapi.com/signup.

Tools (20)

Tool	What it returns
`list_teams`	Team ids, abbreviations and colours for a season
`search_players`	Find players by name
`get_games`	Games with runs, hits and errors by season, date, range or team
`get_schedule`	Upcoming games with the median line across sportsbooks
`get_standings`	Standings from every final game, with run differential and Pythagorean record
`get_injuries`	The latest injury report
`get_ratings`	Our team Elo ratings, ranked
`get_game`	One game: every batting and pitching line, each book's line, win probability
`get_player`	Season batting (AVG, OBP, SLG, OPS, RE24) and pitching (ERA, WHIP, K/9)
`get_player_games`	A player's full batting and pitching game log
`get_leaders`	Season leaders among qualified batters and pitchers
`get_team_stats`	Runs for and against, team batting and opponents' batting
`get_pitch_mix`	A pitcher's arsenal: usage, velocity, whiff rate per pitch type
`get_odds`	Every sportsbook's moneyline, run line and total for a game (5) or a day (10)
`get_plate_appearances`	Plate-appearance play-by-play with base-out state, batted ball, win probability, RE24
`get_pitches`	Pitch-by-pitch: count, type, velocity, location, result
`get_spray_chart`	Where a batter or team hits the ball, by trajectory and field
`get_line_movement`	Snapshots of each sportsbook's line before first pitch
`get_player_props`	Player prop lines by sportsbook, opening and closing
`get_prop_history`	A player's prop lines against the result, game by game

Leagues: mlb (default), ncaabase (NCAA Division I games ESPN carries; pitch tools, spray charts and injuries are not offered for college).

Data

MLB games since 2015 with pitch-by-pitch data (every pitch from 2018; 2015 to 2017 have about 98 to 99% of each season's pitches)
Every plate appearance with base-out state, batted ball, win probability and RE24
Per-sportsbook moneylines, run lines and totals: 4 to 13 books per game from 2015 to 2023 (about 4 in 2015, 10 in 2016 and 2017, 7 to 8 in 2018 to 2020, 12 in 2021 to 2023), usually one book since 2024 in ESPN's own feed, plus opening and closing lines from The Odds API since July 2020 (a median of 7 books in 2021 to 2023 and 8 since 2024); pre-game line snapshots from launch: ESPN's once a day, The Odds API's every hour for games in the next two days
MLB player prop lines by sportsbook (hits, home runs, total bases, RBI, pitcher strikeouts, pitcher outs) from May 2023, with the result against each line (get_player_props, get_prop_history); none for college
NCAA Division I college baseball for the games ESPN carries (not every Division I game)

Coverage by season, read live from the database: https://fastballapi.com/docs

Useful pages

Docs: every endpoint with parameters and a live example response
Data atlas: what exists, which tool exposes it, coverage by season
MLB odds: upcoming moneylines, run lines and totals by sportsbook
Guides: pitch data for a model, pitch mix and whiff rate, Pythagorean standings, run value with runners in scoring position, spray charts
Data: pitch-by-pitch, spray charts, odds history, player props
College baseball: the NCAA Division I games ESPN carries
Pricing: free tier and paid plans
Comparisons: vs pybaseball, vs BallDontLie, vs Sportradar, vs the MLB Stats API
Glossary

Pricing

500 free credits every month, no card. Plans: Starter $19/mo (10,000 credits), Pro $49/mo (30,000), Scale $149/mo (125,000). Wallet top-ups from $5, never expire. https://fastballapi.com/pricing

Attribution

Baseball data from public ESPN data; sportsbook lines and player props from ESPN and The Odds API. Ratings and run values are ours. Not affiliated with MLB, the NCAA or any team.