Federal History

{
  "data": {
    "months": 2,
    "series": [
      {
        "average": {
          "AfD": 27.9,
          "BSW": 3.4,
          "FDP": 4.4,
          "Grüne": 14.3,
          "Linke": 11.7,
          "SPD": 12.2,
          "Union (CDU/CSU)": 21
        },
        "polls_in_window": 13,
        "week_ending": "2026-08-17"
      },
      {
        "average": {
          "AfD": 28,
          "BSW": 3.2,
          "FDP": 4.7,
          "Grüne": 14.1,
          "Linke": 11.6,
          "SPD": 12.3,
          "Union (CDU/CSU)": 20.9
        },
        "polls_in_window": 15,
        "week_ending": "2026-08-24"
      }
    ],
    "window_days": 21
  },
  "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...",
  "project": "Ein Projekt von Karbach.Digital (https://karbach.digital)",
  "source": {
    "polls": "dawum.de",
    "polls_license": "ODbL 1.0",
    "polls_license_url": "https://opendatacommons.org/licenses/odbl/1-0/",
    "processing": "polls.karbach.digital (Max Karbach)"
  },
  "uncertainty": "Plain average of all institutes in a 21-day window, no house-effect correction.",
  "updated_at": "2026-10-18 11:20:02"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.polls.karbach.digital/v1/federal/history?months=6'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://api.polls.karbach.digital/v1/federal/history?months=6' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.05 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.05" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.05 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.polls.karbach.digital%2Fv1%2Ffederal%2Fhistory
const res = await pay("https://api.polls.karbach.digital/v1/federal/history?months=6");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.05 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.05"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.polls.karbach.digital/v1/federal/history?months=6")
    print(res.status_code, res.text)