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polls.karbach.digital — Constituency Lookup by Postcode
x402
polls.karbach.digital — Constituency Lookup 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 German Bundestag constituency associated with a given postcode, including links to detailed race and simulation data.
Price / call$0.01
Success—
StatusUnknown
How this service works
Unabhängige Wahlsimulation für 18 deutsche Wahlen. Monte-Carlo-Modell mit 10.000 Szenarien pro Wahl, kalibriert und intern validiert an 34 historischen Wahlen (Leave-One-Out, MAE ±1.27 Pp). Alle 6 Stunden aktualisiert.
Output
Returns a JSON object with the constituency name, number, state code (e.g. 'SL'), the postcode queried, a URL to the detailed constituency race simulation, and a URL to the full constituency detail endpoint. Also includes metadata such as source attribution (dawum.de polls, ODbL 1.0 license), update timestamp, and a notice that results are scenario analysis, not predictions.
Example use cases
Voter district lookup for civic app
“My user just entered their postcode 80331 — which Bundestag constituency is that in, and what's the constituency number?”
Journalist researching a specific district
“I'm writing about the electoral race in Hamburg and need to know which Wahlkreis postcode 20095 maps to so I can pull the simulation data.”
Election monitoring dashboard
“For each of these postcodes — 10117, 13088, 22305 — tell me which Bundestagswahlkreis they belong to so I can pull the race forecasts for those districts.”
Technical details
Endpoint
GEThttps://api.polls.karbach.digital/v1/constituencies/by-postcode/%7Bplz%7D?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to resolve a German postcode (PLZ) to its corresponding Bundestag constituency number and name, especially as a precursor to fetching detailed election simulation data from the race or detail sibling endpoints. Prefer this over manual lookup tables when you need a programmatic, up-to-date mapping with direct links to Monte-Carlo simulation results.
Side effects
- Postcode does not exist or is invalid — likely returns an error or empty result
- Postcode crosses multiple constituency borders — endpoint returns the main/primary constituency only, which may not represent a minority of addresses in that postcode
- Stale data if the 6-hour refresh cycle has not yet run
- Postcode outside Germany — no match possible
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"name": "Homburg",
"note": "Postcodes can cross constituency borders; this is the main constituency of the postcode.",
"race": "https://api.polls.karbach.digital/v1/constituencies/299/race",
"state": "SL",
"detail": "https://api.polls.karbach.digital/v1/constituencies/299",
"postcode": "66453",
"constituency": 299
},
"docs": "https://api.polls.karbach.digital/v1/",
"model": null,
"notice": "Scenario analysis based on published opinion polls. Not a prediction and not a voting recommendation. Coalitions are arithmetic majorities only, not statemen...",
"source": {
"polls": "dawum.de",
"processing": "polls.karbach.digital (Max Karbach)",
"polls_license": "ODbL 1.0",
"postcode_mapping": "polls.karbach.digital",
"polls_license_url": "https://opendatacommons.org/licenses/odbl/1-0/"
},
"project": "Ein Projekt von Karbach.Digital (https://karbach.digital)",
"updated_at": "2026-10-18T15:28:17.464793",
"uncertainty": null
}
}Tags
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