# polls.karbach.digital – Constituency Direct Mandate Race

> polls.karbach.digital – Constituency Direct Mandate Race is a paid API for AI agents from api.polls.karbach.digital, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-28).

Returns win probability per party, margin, and rating for a German Bundestag constituency's direct mandate race, updated every six hours with source attribution.

## Facts

- Endpoint: GET https://api.polls.karbach.digital/v1/constituencies/:nr/race?utm_source=zero.xyz
- Price: $0.02/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-constituency-direct-mandate-race-c288e72e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rIPgPlgAErmbT1rG911Ze

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-constituency-direct-mandate-race-c288e72e
```

Example prompt: What are the win probabilities for each party in Bundestag constituency 75, and which party is currently favored to take the direct mandate?

## When to prefer this

Use this endpoint when you need party-level win probabilities and margins for a specific German Bundestag constituency direct mandate race. It is the right choice for constituency-level electoral forecasting with source attribution, as opposed to national-level seat projections or general polling aggregates.

## Known failure modes

- Invalid constituency number (outside 1–299) returns a 400 or 404 error
- Constituency number provided as non-numeric string fails pattern validation
- Data temporarily unavailable due to refresh cycle may return stale or empty results
- Rate limiting or payment failure (x402) blocks the request

## How this service works

Who wins the direct mandate in a constituency: win probability per party, margin, rating. Use when asked who will win a constituency seat. Source-attributed, German data, updated every six hours.

## Output

Returns the win probability for each competing party in the specified constituency's direct mandate race, the margin between leading parties, and a rating — all source-attributed and refreshed every six hours.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "nr"
     ],
     "properties": {
      "nr": {
       "type": "string",
       "pattern": "^[1-9][0-9]{0,2}$",
       "description": "Bundestag constituency number 1 to 299"
      }
     }
    },
    "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-constituency-direct-mandate-race-c288e72e/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)