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Polar MCP Server

by NelsonNew
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TypeScript
Hybrid

Polar MCP Server

An MCP (Model Context Protocol) server for the Polar AccessLink API. Connect your Polar fitness data to Claude AI - access workouts, sleep analysis, recovery metrics, heart rate data, and more.

Quick Start (Public Instance)

No setup required! Use our hosted instance:

  1. In Claude: Settings → Integrations → Add MCP Server

  2. Enter the URL: https://polar-mcp-server.n-neuhaeusel.workers.dev/mcp

  3. Claude will open an authorization window — log in with your Polar account

  4. Start chatting about your fitness data!

Features

25 Tools Available

Category

Tools

Description

Exercises

get_exercises, get_exercise

Training data with HR, speed, zones

Exercise Export

get_exercise_fit, get_exercise_tcx, get_exercise_gpx

Export in FIT, TCX, GPX formats

Sleep

get_sleep, get_sleep_range

Sleep stages, score, duration

Recovery

get_nightly_recharge, get_nightly_recharge_range

ANS charge, HRV, breathing rate

Activity

get_daily_activity, get_daily_activity_range, get_activity_samples, get_activity_samples_range

Steps, calories, activity zones

Heart Rate

get_continuous_heart_rate, get_continuous_heart_rate_range

24/7 heart rate monitoring

Training Load

get_cardio_load, get_cardio_load_range, get_cardio_load_history

TRIMP, acute/chronic load

SleepWise

get_sleepwise_alertness, get_sleepwise_circadian_bedtime

Alertness predictions, optimal bedtime

Biosensing

get_body_temperature, get_skin_temperature, get_spo2

Temperature, SpO2 data

User

get_user_info, get_physical_info

Profile, VO2max, resting HR

Supported Devices

  • Polar Pacer / Pacer Pro

  • Polar Vantage V2 / V3

  • Polar Vantage M / M2

  • Polar Grit X / Grit X Pro / Grit X2 Pro

  • Polar Ignite / Ignite 2 / Ignite 3

  • Polar Unite

  • And more...

Example Prompts

Once connected, ask Claude:

  • "Show me my workouts from last week"

  • "How was my sleep last night? Compare it to my weekly average"

  • "Analyze my heart rate variability trends"

  • "What's my current training load status?"

  • "When should I go to bed tonight for optimal recovery?"

  • "Export my last run as a GPX file"

  • "How many steps did I take this month?"

Self-Hosting

Want to run your own instance? Two deployment options available:

Option 1: Cloudflare Workers (Recommended)

Prerequisites

Setup

# Clone and install
git clone https://github.com/NelsonNew/polar-mcp-server.git
cd polar-mcp-server
npm install

# Create KV namespace
npx wrangler kv namespace create OAUTH_KV
# Copy the ID to wrangler.toml

# Set secrets
npx wrangler secret put POLAR_CLIENT_ID
npx wrangler secret put POLAR_CLIENT_SECRET

# Deploy
npm run deploy

After deploying, add the callback URL to your Polar app:

https://YOUR-WORKER.workers.dev/callback

Option 2: Local (Claude Desktop)

# Clone and build
git clone https://github.com/NelsonNew/polar-mcp-server.git
cd polar-mcp-server
npm install && npm run build

# Get access token
export POLAR_CLIENT_ID="your_client_id"
export POLAR_CLIENT_SECRET="your_client_secret"
npm run auth

Add to Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "polar": {
      "command": "node",
      "args": ["/path/to/polar-mcp-server/dist/index.js"],
      "env": {
        "POLAR_ACCESS_TOKEN": "your_access_token"
      }
    }
  }
}

API Reference

All tools use the Polar AccessLink API v3.

Tool

Endpoint

Description

get_user_info

/users/{id}

User profile

get_physical_info

/users/physical-information

VO2max, max HR, resting HR

get_exercises

/exercises

Last 30 days of workouts

get_exercise

/exercises/{id}

Single workout details

get_exercise_fit/tcx/gpx

/exercises/{id}/fit|tcx|gpx

Export formats

get_sleep

/users/sleep

Sleep data

get_nightly_recharge

/users/nightly-recharge

Recovery metrics

get_daily_activity

/users/activities

Daily activity

get_continuous_heart_rate

/users/continuous-heart-rate

24/7 HR

get_cardio_load

/users/cardio-load

Training load

get_sleepwise_alertness

/users/sleepwise/alertness

Alertness predictions

get_body_temperature

/users/biosensing/bodytemperature

Body temp

get_spo2

/users/biosensing/spo2

Blood oxygen

Troubleshooting

Error

Solution

"Polar API error (403)"

Re-authorize or check if data sync is complete

"Polar API error (404)"

Endpoint not available for your device/subscription

No exercise data

Sync your Polar device to Polar Flow app first

Privacy

  • Your Polar credentials are never stored

  • OAuth tokens are managed securely by the Cloudflare Workers OAuth provider

  • Each user gets their own isolated MCP session

  • No fitness data is logged or stored on our servers

Contributing

Contributions welcome! Please open an issue or PR.

License

MIT

Links

This server cannot be installed

F
license - not found
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quality - not tested
B
maintenance

How are these scores calculated?

Maintenance

–Maintainers
34dResponse time
–Release cycle
–Releases (12mo)

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