Cernion

Cernion Municipality API

The Municipality API from Cernion — 2 operation(s) for municipality.

GitHub OpenAPI

Operations 2

GET /api/municipality/lookup Look up a German municipality by name, PLZ, or AGS #
GET /api/municipality/reverse-geocode Resolve a German municipality (AGS) from WGS84 coordinates #

Specifications

⚙
OpenAPI
https://artifacts.apis.io/cernion-de/openapi/cernion-de-municipality-api-openapi.yml

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OpenAPI Specification

cernion-de-municipality-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: Cernion Energy Tools Municipality API
  version: 0.99.22
  description: 'MicroService Agent System for Energy Markets - REST API with AI integration.


    CERNION_TOKEN: request at https://cernion.de/ or by email: dev@stromdao.com.


    For the public instance at https://api.cernion.de/, create your token at https://cernion.de/cet-token/.'
servers:
- url: https://api.cernion.de
  description: API Server
tags:
- name: Municipality
paths:
  /api/municipality/lookup:
    get:
      summary: Look up a German municipality by name, PLZ, or AGS
      tags:
      - Municipality
      operationId: municipality_lookup
      parameters:
      - name: municipality
        in: query
        required: false
        schema:
          type: string
          example: Hockenheim
        description: Municipality name or 5-digit PLZ.
      - name: ags
        in: query
        required: false
        schema:
          type: string
          example: 08226032
        description: Amtlicher Gemeindeschlüssel, takes priority over municipality.
      - $ref: '#/components/parameters/TokenQuery'
      responses:
        '200':
          description: Municipality profile (found:false if unresolved)
          content:
            application/json:
              schema:
                type: object
                properties:
                  found:
                    type: boolean
                  name:
                    type:
                    - string
                    - 'null'
                  ags:
                    type:
                    - string
                    - 'null'
                  state:
                    type:
                    - string
                    - 'null'
                  postalCode:
                    type:
                    - string
                    - 'null'
                  population:
                    type:
                    - integer
                    - 'null'
                  areaSqKm:
                    type:
                    - number
                    - 'null'
                  sourceStatus:
                    type: string
      description: Resolves a municipality profile (AGS, name, Bundesland, population, PLZ) from a municipality name, a 5-digit PLZ, or an Amtlicher Gemeindeschlüssel (AGS). Offline lookup against Destatis Gemeindegrenzen 2022 (GV100, 10,990 municipalities) — no external API call. found:true with population:null means the name/PLZ resolved but there was no Destatis GV100 match (name+state known only).
  /api/municipality/reverse-geocode:
    get:
      summary: Resolve a German municipality (AGS) from WGS84 coordinates
      tags:
      - Municipality
      operationId: municipality_reverseGeocode
      parameters:
      - name: lat
        in: query
        required: true
        schema:
          type: number
          example: 49.3183
      - name: lon
        in: query
        required: true
        schema:
          type: number
          example: 8.5495
      - $ref: '#/components/parameters/TokenQuery'
      responses:
        '200':
          description: Municipality profile resolved from coordinates (found:false if unresolved)
          content:
            application/json:
              schema:
                type: object
                properties:
                  found:
                    type: boolean
                  name:
                    type:
                    - string
                    - 'null'
                  ags:
                    type:
                    - string
                    - 'null'
                  state:
                    type:
                    - string
                    - 'null'
                  postalCode:
                    type:
                    - string
                    - 'null'
                  population:
                    type:
                    - integer
                    - 'null'
                  areaSqKm:
                    type:
                    - number
                    - 'null'
                  sourceStatus:
                    type: string
      description: Reverse-geocodes a lat/lon pair via OpenStreetMap Nominatim to a German Amtlicher Gemeindeschlüssel (AGS), then joins it against the same Destatis GV100 profile as GET /municipality/lookup. found:false means the coordinates do not fall inside a German municipality boundary known to Nominatim (e.g. outside Germany, or open water). Live external call — not cached; the public Nominatim instance is rate-limited to ~1 request/second, set NOMINATIM_ENDPOINT for a private mirror under sustained load.
components:
  parameters:
    TokenQuery:
      name: token
      in: query
      required: false
      schema:
        type: string
      description: Optional Cernion MCP token as URL query parameter. If provided, it overrides CERNION_TOKEN for this request. Prefer Authorization Bearer header in production to reduce token exposure in URLs/logs.
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: 'Optional Cernion MCP token. If not provided, falls back to CERNION_TOKEN from environment. Request token at https://cernion.de/ or by email: dev@stromdao.com.'