APEX Nexus Platform
Integrated EHR backbone — 663+ data endpoints, 355+ FHIR types, semantic queries, GPID identity, and clinical workflows.
https://api.parkerapex.comhttps://developers.parkerapex.comLive API Status — APEX Nexus
Probing production endpoints…
Rate Limits & SLA
Rate limit
10,000 req/min
Burst
500 req/sec
Uptime SLA
99.95%
Support
24×7 P1 · 1h response
P95 latency
< 450ms FHIR
Retention
7 years clinical
663+
Production Routes
7
Data Domains
355+
FHIR Types
37+
Documented APIs
5
Compliance
Platform Architecture
FHIR R4 Layer
355+ types · SMART · Bulk Export
Identity Layer
GPID · Plexus IAM · OAuth 2.0
Semantic Layer
Federated queries · Purpose-of-use
Clinical Layer
EHR · appointments · medications · imaging
Trust Layer
HIPAA · SOC 2 · HITRUST · ISO 27001
Data Lake
HAPI R4 longitudinal store
Data Domains
Clinical EHR
248+Patients, encounters, medications, imaging, telehealth, trials, and administration.
FHIR R4 Interoperability
83+355+ resource types, SMART on FHIR, bulk $export, subscriptions.
Identity & GPID
59+Golden patient index, match/merge/split, Plexus IAM, and actor-scoped access.
Semantic Data Layer
12+Federated queries, NL-to-SQL, cohort analytics, and purpose-of-use enforcement.
Exchange & Documents
76+TEFCA QHIN, Beacon ingest, SMART Health Cards, and document intelligence.
Mobile & Patient Portal
26+Pulse PHR, provider mobile APIs, portal modules, and patient-facing workflows.
Integration Path
Explore the platform
Review data domains, OpenAPI specs, and curated partner APIs.
2Get credentials
Apply as a partner, then issue scoped API keys or OAuth clients.
3First FHIR read
Fetch a Patient resource with SMART OAuth bearer token.
4OpenAPI contracts
Browse 13 machine-readable specs with Try-it-out.
Core Nexus API Services
FHIR R4 API
HL7 FHIR R4 compliant REST API — 300+ platform resource types (25 gateway REST documented), 137+ endpoints. Full SMART on FHIR OAuth 2.0, bulk export, subscriptions, and terminology services.
https://api.parkerapex.com/fhir/R4/fhir/R4/metadataCapability Statement
/fhir/R4/.well-known/smart-configurationSMART on FHIR Configuration
/fhir/R4/PatientSMARTSearch Patients
/fhir/R4/Patient/{id}SMARTRead Patient
/fhir/R4/PatientSMARTCreate Patient
/fhir/R4/ObservationSMARTSearch Observations
/fhir/R4/ObservationSMARTCreate Observation
/fhir/R4/ConditionSMARTSearch Conditions
Identity & GPID Resolution API
Golden Record Patient Identity (GPID) — deterministic SHA-256 matching, identity lifecycle management, merge/split operations, and dual-verified data resolution.
https://api.parkerapex.com/api/identity/api/identity/matchServiceMatch Demographics
/api/identity/resolveServiceResolve or Create GPID
/api/identity/{gpid}BearerGet Identity Record
/api/identity/mergeBearerMerge GPIDs
/api/identity/splitBearerSplit GPID
NPI Provider Registry API
National Provider Identifier (NPI) lookup, validation, and search. Proxied access to CMS NPPES with caching and enrichment.
https://api.parkerapex.com/api/npi/api/npi/searchBearerSearch Providers
/api/npi/{npi}BearerLookup Provider by NPI
/api/npi/validate/{npi}Validate NPI Format
Platform Operations & Monitoring API
System health checks, observability endpoints, audit logging, and operational metrics across all Parker Apex services.
https://api.parkerapex.com/healthHealth Check
/readyReadiness Check
/statusSystem Status
/api/auth/meBearerCurrent User Profile
Route catalog
663 production routes grouped by data domain. Signed-in partners can search the full catalog in the API Explorer.
Clinical EHR
262+ routes
Identity & IAM
113+ routes
FHIR & Interop
85+ routes
Document Intelligence
73+ routes
Platform Ops
60+ routes
Other Platform
39+ routes
Mobile & Portal
31+ routes
OpenAPI contract
Machine-readable Nexus spec: apex-nexus-v1.openapi.yaml
Integration toolkit
Official SDKs
APEX Nexus certification track
11 required items · platform + product-specific checks
- First authenticated API call in sandbox
- OAuth or API key with least-privilege scopes
- FHIR R4 read against sandbox lake
- GPID boundary headers on write paths
- Webhook HMAC-SHA256 verification implemented
- Webhook idempotency by delivery ID
+8 more on the certification page
Complete all required items before production go-live
Webhook events for APEX Nexus
Subscribe at /webhooks — verify HMAC-SHA256 signatures
pipeline.sync.completedPipelineFHIR or batch sync job finished successfully.
{
"event": "pipeline.sync.completed",
"job_id": "job_abc123",
"partner_gpid": "CMS-00000001",
"resource_types": [
"Patient",
"Observation"
],
"records_processed": 1240,
"completed_at": "2026-06-13T20:00:00Z"
}pipeline.sync.failedPipelineSync job failed after retries.
{
"event": "pipeline.sync.failed",
"job_id": "job_abc123",
"error_code": "VALIDATION_ERROR",
"message": "Bundle entry 14 failed FHIR validation",
"failed_at": "2026-06-13T20:01:00Z"
}fhir.subscription.notificationFHIRR4 Subscription resource triggered — payload is FHIR Bundle.
{
"resourceType": "Bundle",
"type": "history",
"entry": [
{
"resource": {
"resourceType": "Observation",
"id": "obs-1"
}
}
]
}test.pingSystemSynthetic test delivery from the developer portal Test button.
{
"event": "test.ping",
"message": "Parker Apex webhook test delivery",
"webhook_id": 1
}