Junction

API

Wearable and health app data API with US and EU data regions, formerly Vital

Price: Free sandbox, then $300/month
Access: Team API key (X-Vital-API-Key)

About

Junction (formerly Vital) connects 300+ wearables and health apps through a Link widget and one API for activity, sleep, body and vitals data, with webhooks. Each team lives in a US or EU (Belgium) region. It also sells US lab testing. The free sandbox allows 50 users with synthetic data.

What you can do with it

Read sleep, activity and heart rate data from users' wearables through one API
Keep wearable data of EU users in Junction's EU region under GDPR
Sync Apple HealthKit and Health Connect data with Junction's mobile SDKs

Get started

Create a team in the US or EU region and copy its API key
Connect a user's wearable through the Junction Link widget
Fetch summaries or receive them on your webhook

Example

curl "https://api.us.junction.com/v2/summary/sleep/$JUNCTION_USER_ID?start_date=2026-09-01" \
  -H "X-Vital-API-Key: $JUNCTION_API_KEY"

Details

Hosting: Hosted service
Available in: Worldwide
Official SDKs: Python, JavaScript/TypeScript, Go, Java, Swift, Kotlin, Dart
MCP server: None