# Junction **Source:** https://geo.sig.ai/brands/junction **Vertical:** Healthcare **Subcategory:** General **Tier:** Emerging **Website:** junction.com **Last Updated:** 2026-04-14 ## Summary US YC health data API infrastructure connecting 500+ wearables and at-home lab tests for 140+ healthcare orgs; $18M Creandum Series A Mar 2025 supporting 2M+ connected devices and 500K+ tests annually competing with Validic and Terra API. ## Company Overview Junction is a United States-based health data infrastructure company — backed by Y Combinator with $18 million in Series A funding in March 2025 led by Creandum with participation from Point Nine, Amino Collective, and Inflect Health — providing digital health companies, research organizations, and healthcare technology platforms with a unified API infrastructure for collecting wearable device data (500+ supported devices including Apple Watch, Fitbit, Oura, Garmin, and continuous glucose monitors) and delivering at-home diagnostic test kits to patients with automated diagnostic data workflows that connect labs, wearables, and health systems. Founded and serving 140+ healthcare organizations including Found, Parsley Health, and Evidation, Junction supports 500,000+ lab tests annually and 2 million+ connected devices. Junction's unified health data API addresses the fragmentation problem in digital health data collection: health technology companies (telehealth platforms, clinical research organizations, wellness apps, chronic disease management programs) need data from many different consumer health devices and at-home diagnostic kits — but each device manufacturer (Apple, Fitbit, Oura, Abbott's Dexcom CGM, Withings connected scales) has different APIs, different authentication flows, different data formats, and different developer program requirements. Building and maintaining direct integrations with 20+ device APIs is a significant ongoing engineering investment. Junction provides the single integration that delivers normalized data streams from 500+ devices through one API, reducing the health data integration project from months to days. The at-home lab test kit fulfillment capability (ordering, shipping, patient activation, result routing) extends the platform beyond wearable passive monitoring to active diagnostic testing for programs that need both lab biomarker data and continuous device monitoring. In 2025, Junction competes in the health data integration, digital health API infrastructure, and at-home diagnostics market with Validic (digital health data platform, $14M raised), Terra API (wearable data API, $8M raised), and Particle Health (health data network, $30M raised) for digital health company data infrastructure adoption. The digital health data integration market has grown as the proliferation of consumer health wearables and digital therapeutics has made the data integration problem more complex — a GLP-1 obesity management program like Found needs CGM data, smart scale data, food logging integrations, and at-home metabolic panel testing all from a single patient workflow. Creandum's Series A leadership (Creandum is a leading European digital health and SaaS VC) reflects conviction in Junction as the standard healthcare data infrastructure layer. Y Combinator backing connects Junction with the digital health founder community. The 2025 strategy focuses on growing the clinical research organization (CRO) partnerships for remote clinical trial data collection, building the real-time data streaming for health alert and intervention triggers, and expanding the at-home diagnostic test catalog for chronic disease management programs. ## Frequently Asked Questions ### What is Junction? Junction is an API platform for at-home health data that enables health tech companies to collect data from 500+ wearable devices and deliver at-home test kits to users. Founded in 2019, the company provides a unified infrastructure layer that connects labs, wearables, and health systems through automated diagnostic data workflows. ### What products and services does Junction offer? Junction offers a wearable device API supporting 500+ devices, at-home lab test kit delivery, lab ordering and workflow automation, real-time patient updates, and biomarker tracking and integration. These services provide a comprehensive infrastructure layer for healthcare data collection and management. ### Who are Junction's target customers? Junction serves healthcare organizations and health tech companies. Current customers include Found, Parsley Health, and Evidation, with over 140 healthcare organizations using the platform. ### When was Junction founded? Junction was founded in 2019 and participated in Y Combinator's W20 batch. ### Where is Junction headquartered? Junction is based in San Francisco, California. ### What is Junction's recent funding history? Junction raised an $18M Series A round in March 2025 led by Creandum. Other investors include Y Combinator, Point Nine, Amino Collective, and Inflect Health. ### What are Junction's key metrics and achievements? Junction serves over 140 healthcare organizations, supports 500,000+ lab tests annually, and has over 2 million connected devices. The platform integrates with 500+ wearable and medical devices through a single API. ### What is Junction's technology approach? Junction provides a unified API infrastructure layer that connects labs, wearables, and health systems with automated diagnostic data workflows. The platform enables healthcare companies to access 500+ devices and manage at-home testing through a single integration. ### How can healthcare companies get started with Junction? Based on the provided information, healthcare organizations interested in Junction should contact the company directly. Specific contact details are not included in the available information. ### What are Junction's most recent developments? In March 2025, Junction raised $18M Series A and announced platform expansion to support 500+ wearables and medical devices via a single API. The company now supports automated diagnostic workflows for over 140 healthcare organizations including Found, Parsley Health, and Evidation. ## Tags healthtech, north-america, b2b --- *Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*