Ledger & FedNow API

Health Vault, medical credit, FedNow instant payments, billing gateway, and financial account management for healthcare commerce.

OpenAPI Spec ledger.parkerapex.com/ledger

Live API Status — Ledger & FedNow API

Probing production endpoints…

Rate Limits & SLA

Rate limit

200 payments/min

Burst

20 req/sec

Uptime SLA

99.95%

Support

24×7 P1 · 1h

P95 latency

< 3s FedNow

Retention

Financial 7y

FedNow

Payments

Instant settlement

HSA/FSA

Vault

Health savings accounts

Med

Credit

Medical credit lines

Account

FHIR

Invoice & PaymentNotice

Capabilities

Velocity RCM

Claims to payment lifecycle

Pulse Billing

Subscription & tier gating

API Reference

Full OpenAPI explorer

OpenAPI contract

Machine-readable spec: apex-ledger-v1.openapi.yaml

Download apex-ledger-v1.openapi.yaml →

Integration toolkit

Sandbox API Playground OpenAPI Try-it-out Certification Webhooks

Postman collection (5 requests)Import the same JSON into Insomnia

Official SDKs

Generate TypeScript client →·Python →·All SDKs

Apex Ledger certification track

11 required items · platform + product-specific checks

Full checklist →

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

+9 more on the certification page

Complete all required items before production go-live