eCFR

eCFR Admin API

Provides metadata about federal agencies and their CFR references, enabling lookup of which titles and chapters correspond to specific agencies.

Documentation GitHub OpenAPI

Documentation

https://www.ecfr.gov/developers/documentation/api/v1

Specifications

https://raw.githubusercontent.com/api-evangelist/ecfr/refs/heads/main/openapi/ecfr-openapi.json

OpenAPI Specification