# polls.karbach.digital – Bundestag Constituency by Postcode

> polls.karbach.digital – Bundestag Constituency by Postcode is a paid API for AI agents from api.polls.karbach.digital, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-28).

Returns the Bundestag (federal parliamentary) constituency that a given 5-digit German postcode belongs to, with source attribution, updated every six hours.

## Facts

- Endpoint: GET https://api.polls.karbach.digital/v1/constituencies/by-postcode/:plz?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polls-karbach-digital-bundestag-constituency-by-postcode-c3d4f025
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_f5BoJRPBLV7uzXWKEzgTV

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability polls-karbach-digital-bundestag-constituency-by-postcode-c3d4f025
```

Example prompt: Which Bundestag constituency does postcode 10117 belong to?

## When to prefer this

Use this endpoint when you have a 5-digit German postcode and need to identify the corresponding Bundestag (federal) constituency (Wahlkreis). It is the right choice for voter-facing tools, election journalism, political data enrichment, and any application that needs to bridge a German address or postcode to federal election geography. Prefer it over manual lookup tables because it is source-attributed and updated every six hours.

## Known failure modes

- Invalid postcode format (not exactly 5 digits) — validation error returned
- Postcode does not exist or is not assigned to a constituency — not found response
- Transient upstream data unavailability — service error

## How this service works

Which Bundestag constituency a German postcode belongs to. Use when you have a German postcode and need the constituency. Source-attributed. Refused (503, not charged) if data is older than 13 hours.

## Output

Returns the Bundestag constituency (Wahlkreis) name and number corresponding to the provided 5-digit German postcode, along with source attribution. Data is refreshed every six hours from German official sources.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "plz"
     ],
     "properties": {
      "plz": {
       "type": "string",
       "pattern": "^\\d{5}$",
       "description": "German postcode"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/polls-karbach-digital-bundestag-constituency-by-postcode-c3d4f025/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.polls.karbach.digital](https://www.zero.xyz/host/api.polls.karbach.digital/llms.txt)