Challenge
Replayed webhooks create duplicates
Agnotic approach
Signature verification plus idempotency keys so a re-delivered payload never double-writes.
Terra API
Terra API Integration Services
Supporting every wearable your users own one integration at a time does not scale. We build on the Terra API, a multi-wearable aggregator, with the user-connection flow, signed webhooks, backfill and PGHD-to-FHIR pipeline that turn one connection into broad device coverage.
Terra APIWebhooksFHIR R4OAuth2
Trusted by global innovators
What is the Terra API used for?
The Terra API is a unified health data API that connects an app to 500+ wearables and health apps, such as Garmin, Fitbit, Oura and Apple Health, and normalizes their data into one schema. Digital health and fitness products use it for broad device coverage. Agnotic Technologies builds the connection flow, webhook handling and data pipeline behind it.
Instead of integrating Garmin, Fitbit, Oura, Whoop, Apple Health and others one by one, you integrate Terra once for activity, body, daily, sleep and nutrition data. It uses a widget or SDK connection flow, webhooks and REST backfill; provider-specific gaps still need mapping.
As with any aggregator, success is downstream: verifying webhook signatures, idempotent processing, backfilling without double-counting and mapping Terra payloads into FHIR Observations your platform can trust. We build that pipeline so one Terra integration covers a broad device footprint without per-provider upkeep.
How does Terra data reach your platform?
See how we turn a single Terra connection into a clean, consented, multi-wearable pipeline.
Common failure modes
Where do Terra integrations break?
Challenge
Backfill overlaps the live stream
Agnotic approach
Windowed de-duplication reconciling historical and real-time data.
Challenge
Provider gaps in a data category
Agnotic approach
Per-provider capability checks so product expectations match actual coverage.
Challenge
Normalized units need clinical mapping
Agnotic approach
UCUM units and LOINC codes applied when mapping to FHIR Observations.
Which Terra API surfaces do we build on?
We build against Terra's connection flow, webhooks, and normalized data model.
Terra connection flow
The Terra widget/SDK user-connection flow, provider linking, and connection-status handling wired end to end.
Normalized data model
Terra's activity, body, daily, sleep, and nutrition categories mapped into your schema.
Webhook signatures & idempotency
Signature-verified webhook receivers with idempotent processing and replay safety.
PGHD → FHIR Observation
Normalized payloads mapped to FHIR R4 Observation with LOINC codes and UCUM units.
Historical backfill
REST-based backfill of data predating the connection, de-duplicated against the live stream.
Where it runs
Terra workflows we build
Wellness & fitness apps
Broad wearable coverage for engagement features.
Digital health platforms
Multi-provider data feeding personalized insights.
Corporate wellness
Wearable data across a member population.
Coaching & DTx
Activity and sleep data driving coaching logic.
Clinical research
Consented multi-wearable data for studies.
RPM extensions
Consumer wearables supplementing clinical devices.
One API, a broad device footprint
Terra collapses dozens of wearable integrations into one well-engineered connection.
1
Integration for 500+ wearables and apps, per Terra
HMAC
Webhook signature checked on every delivery
Backfill
History requested once, then updates by push
Compliance-First Healthcare App Development Services Backed by Global Standards
15-Minute Scoping Call01
HIPAA
Health Insurance Portability and Accountability Act
Protect PHI with privacy-first architecture, encrypted storage and transmission, strict access controls, and traceable audit logs.
02
GDPR
General Data Protection Regulation
Implement lawful consent flows, data minimization, retention controls, and secure processing for sensitive health data.
03
FHIR
Fast Healthcare Interoperability Resources
Enable standardized health data exchange across apps, care teams, and systems through standards-based FHIR APIs.
04
HL7
Health Level Seven International
Support enterprise-grade interoperability with HL7-based integrations for records, events, and clinical messaging workflows.
05
HITRUST
Health Information Trust Alliance
Align security programs to healthcare-specific control and risk management practices trusted by providers and ecosystem partners.
06
HITECH
Health Information Technology for Economic and Clinical Health Act
Design with breach notification readiness, digital record safeguards, and operational controls that support regulated care programs.
07
SaMD
FDA Software as a Medical Device
Plan software quality, traceability, and documentation pathways for products that may require SaMD review and submission.
08
MDR (EU)
Medical Device Regulation (European Union)
Prepare EU market-ready processes for risk classification, evidence tracking, and lifecycle governance under MDR expectations.
09
SAMHSA
Substance Abuse and Mental Health Services Administration
Apply confidentiality controls and consent-aware sharing models for behavioral and mental health data experiences.
Standards we build against
Which standards apply to Terra data?
FHIRLOINCUCUMWebhookHIPAA
Our Process
How does Agnotic build a Terra integration?
A phased approach treating connection flow, webhook reliability, and FHIR mapping as parallel tracks.
1.
Discovery & Scope
We map Terra's data categories to your product needs and design the connection and consent model.
Consent-first design
2.
Sandbox & App Registration
Terra developer account, connection widget, and webhook validation against test data.
Sandbox-validated
3.
Build & Test
Signature-verified webhooks, backfill, de-duplication, and the normalized-to-FHIR mapping.
Idempotent by design
4.
Go-Live & Monitoring
Production go-live with webhook-delivery and connection-health dashboards.
Always monitored
Aggregator table
Which Terra data categories fit your product?
Terra normalizes providers into a small set of categories.
| Category | Contains | Typical use | Notes |
|---|---|---|---|
| Activity | Workouts, steps, HR | Fitness & engagement | Rich per-workout detail. |
| Daily | Daily summaries | Trends & dashboards | Good for longitudinal views. |
| Sleep | Sleep stages | Recovery & wellness | Provider coverage varies. |
| Body | Weight, HR, glucose | Vitals & RPM | Overlaps with device categories. |
| Nutrition | Meals & macros | Coaching apps | Provider-dependent. |
Provider coverage differs per category; we verify which providers supply the data you actually need.
Facts and sources
Terra API facts and sources
Each fact below links to Terra's own documentation.
Terra's Unified API connects an app to 500+ wearables and health apps through one integration; Terra handles each provider's authentication, API and data model and normalises the data into one schema.
Source: Terra docs, Unified API overviewTerra pushes new data to the destination you configure, such as a webhook, a SQL database, cloud storage or a queue; the API is event based, so you request data only to backfill history from before the user connected.
Source: Terra docs, Unified API overviewEvery webhook Terra sends includes an HMAC-based terra-signature header, and signature verification needs the raw, unaltered request body.
Source: Terra docs, WebhooksTerra encrypts data in transit, retries webhook deliveries when your server is down, and shows every delivery attempt in its dashboard.
Source: Terra docs, Unified API overview
Featured case study
Read Case StudyLera Health: compliant women's health platform
Related proof of compliant, integration-heavy delivery: the multi-source data layer we built for Lera Health reflects the same normalization discipline we bring to aggregated wearable data.
Why Partner With Us
15-Minute Scoping CallWhy bring your Terra work to Agnotic?
We build Terra pipelines that scale to many providers without per-provider upkeep.
Compliance-First by Default
Consent, connection lifecycle, and audit trails built in from sprint one.
Real Aggregation Depth
We know Terra's normalized model and where provider-specific gaps hide.
Faster Go-To-Market
One Terra integration opens up hundreds of devices without a build per provider.
Dedicated Product Teams
One accountable team owning connection, webhooks, and FHIR mapping.
Frequently Asked Questions
It depends on the data categories and providers you need, whether you backfill history, how deep the FHIR mapping goes, and how your consent model works across regions. Because one integration covers many devices, most effort sits in the pipeline rather than per-provider work.
Cost scales with the data categories you ingest, FHIR persistence, analytics, and consent handling across regions; Terra's own fees are agreed separately with Terra. We scope against your data categories and share an estimate after discovery.
Yes. Terra requires a developer account and API credentials, and the connection widget must be configured for your providers. We handle the technical setup and sequence account provisioning so it doesn't block engineering.
Yes. Terra pushes data to a webhook, database, cloud storage or queue, and we route it from there into your app, EHR, RPM dashboard or data warehouse, mapped to FHIR R4 Observations with LOINC codes and UCUM units.
Yes. A first release covers one workflow, such as daily activity and sleep from your users' main wearables feeding one feature, with the connection flow, signed webhooks and monitoring that workflow needs. More categories and providers follow in later releases.
AI tools help our engineers draft code and tests, but a person reviews every change, and it passes the same automated tests and security checks as any other code. Which tools may see your code or data is agreed with you at the start.
Yes. Terra suits broad consumer-wearable coverage; we combine it with dedicated clinical integrations like Dexcom CGM where fidelity matters, RPM workflows, and telehealth so data appears in the visit.
Terra suits products that need many providers through one integration. A direct integration can suit a product built around one or two devices, or a data category Terra does not cover. We compare both against your device list on the scoping call.
Ready to connect hundreds of wearables through Terra?
Tell us your data categories and providers. We'll return a realistic pipeline plan.
contact@agnotic.com
Partnerships
contact@agnotic.com