# eCFR Versioner Service API

**Canonical:** https://apis.io/apis/ecfr/ecfr-versioner-service-api/  
**Provider:** eCFR — https://apis.io/providers/ecfr/  
**Base URL:** https://www.ecfr.gov/api/versioner/v1  
**Documentation:** https://www.ecfr.gov/developers/documentation/api/v1

eCFR Versioner Service API is one of 3 APIs that [eCFR](https://apis.io/providers/ecfr/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Versioner Service. The published artifact set on APIs.io includes an OpenAPI specification and API documentation.

Access CFR content and structure files through JSON and XML

## Machine-readable artifacts (2)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/ecfr/refs/heads/main/openapi/ecfr-versioner-service-api-openapi.yml
- **Documentation** — https://www.ecfr.gov/developers/documentation/api/v1

## Other eCFR APIs (2)

- [eCFR Admin Service API](https://apis.io/apis/ecfr/ecfr-admin-service-api/)
- [eCFR Search Service API](https://apis.io/apis/ecfr/ecfr-search-service-api/)

## Tags

Versioner Service

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/ecfr/ecfr-versioner-service-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/ecfr/.