polls.karbach.digital

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "docs": "https://api.polls.karbach.digital/v1/",
  "x402": "https://x402.org",
  "asset": "USDC",
  "error": "payment_required",
  "network": "Base",
  "project": "Ein Projekt von Karbach.Digital (https://karbach.digital)",
  "price_usd": 0.02,
  "free_trial": "Try before you pay: put /try in front of any paid path (for example https://api.polls.karbach.digital/try/v1/federal/trend). Same answer, no payment, 3 calls per day per IP address.",
  "how_to_pay": "This endpoint is paid per call via x402. Read the PAYMENT-REQUIRED header, pay with an x402 client (for example the x402 Python or TypeScript SDK) and repeat the request.",
  "description": "Who wins the direct mandate in a constituency: win probability per party, margin, rating."
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x6d8444CaEd95D9155785Da10aC00247948957D61",
    "amount": "20000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "pathParams": {
          "nr": "299"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "data": {
            "state": "SL",
            "rating": "sicher",
            "election": "btw-2029",
            "favourite": "AfD",
            "constituency": 299,
            "incumbent_party": "CDU/CSU",
            "win_probability": {
              "AfD": 0.6933,
              "FDP": 0,
              "SPD": 0.1901,
              "Linke": 0.0002,
              "CDU/CSU": 0.1164
            },
            "first_vote_projection": {
              "AfD": 32.21,
              "FDP": 3.62,
              "SPD": 26.13,
              "Linke": 8.91,
              "CDU/CSU": 21.86
            },
            "expected_margin_points": 6.78
          },
          "docs": "https://api.polls.karbach.digital/v1/",
          "model": {
            "method": "MC-Sampling pro WK, n=10000 Iterationen, σ_total 4.08 Pp = √(UNS² 2.77 + Personen² 3.00) · Inkumbenz-Bonus +3.0 Pp auf den BTW-2025-Direktmandatsinhaber",
            "samples": 10000
          },
          "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",
            "polls_license_url": "https://opendatacommons.org/licenses/odbl/1-0/"
          },
          "project": "Ein Projekt von Karbach.Digital (https://karbach.digital)",
          "updated_at": "2026-10-18T12:55:10.873908",
          "uncertainty": "Win probabilities from simulation with correlated errors and per-party sigma; rating: sicher, wahrscheinlich, umkämpft."
        }
      }
    },
    "schema": {
      "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"
            }
          }
        }
      }
    },
    "routeTemplate": "/v1/constituencies/:nr/race"
  }
}

Provenance

Seen in the source catalog

2026-10-18 14:02Z

Last indexed by Roundhouse

2026-10-26 22:40Z

Last enriched (probe, favicon, geo)

2026-10-18 15:15Z

x402 version

2

Max timeout

300s

Liveness probe

HTTP 402