# Firely

**Canonical:** https://apis.io/providers/firely-server/  
**Website:** https://fire.ly  
**APIs profiled:** 3

Firely is an Amsterdam-based health IT company and one of the original co-developers of the HL7 FHIR (Fast Healthcare Interoperability Resources) specification. Co-founded by Ewout Kramer and Martijn Harthoorn (both long-time HL7 FHIR core team members), Firely builds the canonical FHIR toolchain used by payers, providers, health authorities, and digital health vendors worldwide. The Firely platform is anchored by Firely Server (formerly Vonk) — a certified production-grade FHIR server with native support for MongoDB and SQL Server, deployable on Windows, Linux, macOS, Docker, and Kubernetes across on-premise, Azure, AWS, and Google Cloud. Firely Server is G10, ONC, and ISiK certified and supports SMART on FHIR, Bulk Data, CDS Hooks, Subscriptions, Terminology Services, and FHIR Mapping. The product family also includes Simplifier.net (the global FHIR profile registry and package server hosting ~9,000 projects, 40,000+ profiles, and 1,600+ implementation guides), Forge (FHIR profile editor), Firely Terminal (command-line FHIR tool with FQL/FSH/FHIRPath support), the open-source Firely .NET SDK (the de-facto reference C# FHIR library), the firely-cql-sdk for Clinical Quality Language, the Firely Validator API, FHIR Facade, Firely Server Ingest, and Firely Auth. Customers include UCSF, Humana, Roche, NHS, Opala, and the World Health Organization. Firely does not operate a hosted multi-tenant FHIR-as-a-service offering with a public REST endpoint; customers run Firely Server in their own environments. The public developer surface is therefore the Firely software products (Firely Server, .NET SDK, Terminal), the Simplifier.net package and registry APIs, and the open HL7 FHIR REST API contract that every Firely Server instance implements.

## Kin Score — 27.7 / 100 (thin)

Scored 2026-08-24 under rubric 0.13.0. Trend: flat (+0.4 from 27.3).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 51.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 2.6 |
| Developer Ergonomics | 35.7 |
| Commercial Clarity | 13.2 |
| Access Clarity | 13.2 |

Regulatory layer — **Health**: 7.5 (matched via tags).

## Agent readiness — 22.9 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | na |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | na |
| Error Semantics | no |
| OpenAPI Examples | verified |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | na |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## APIs (3)

- **Firely Server FHIR REST API** — Every Firely Server (formerly Vonk) instance exposes the standard HL7 FHIR REST API contract — type-level and instance-level CRUD, search, history, batch/transaction, capability...
- **Firely Catalog API** — The Catalog API from Firely — 1 operation(s) for catalog.
- **Firely Simplifier.net FHIR Package API API** — The Simplifier.net FHIR Package API API from Firely — 2 operation(s) for simplifier.net fhir package api.

## Agentic access (1)

- **Firely Server Agentic Access** — 3 operations

## Security (1)

- **Firely Server Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Tags

FHIR, HL7, Healthcare, Health IT, Interoperability, Clinical Data, FHIR Server, Vonk, Simplifier, Forge, Terminology, SMART on FHIR, Bulk Data, CDS Hooks, Implementation Guides, .NET SDK, CQL, Profile Registry

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/firely-server/). Scores are computed from the provider's own public artifacts under a published rubric.