Prediction Markets

{
  "next_page": null,
  "page": 0,
  "page_size": 25,
  "rows": [
    {
      "category": "Economics",
      "city": null,
      "close_time": "2026-09-16T17:59:00Z",
      "counterpart_market_id": null,
      "event_ticker": "KXFEDDECISION-26SEP",
      "implied_probability": 0.49,
      "liquidity": 0,
      "market_id": "KXFEDDECISION-26SEP-H0",
      "market_url": null,
      "matched_on": [
        "kalshi"
      ],
      "no_price": 0.52,
      "open_interest": 10072125.21,
      "question": "Will the Federal Reserve Hike rates by 0bps at their September 2026 meeting?",
      "scraped_at": "2026-10-16T02:46:40.011943Z",
      "series": "KXFEDDECISION",
      "source_url": "https://api.elections.kalshi.com/trade-api/v2/markets/KXFEDDECISION-26SEP-H0",
      "spread": null,
      "status": "active",
      "subtitle": "Fed maintains rate",
      "ticker": "KXFEDDECISION-26SEP-H0",
      "venue": "kalshi",
      "volume": 14781750.91,
      "yes_price": 0.49
    },
    {
      "category": null,
      "city": null,
      "close_time": "2026-09-16T00:00:00Z",
      "counterpart_market_id": null,
      "event_ticker": "481717",
      "implied_probability": 0.001,
      "liquidity": 761752.54191,
      "market_id": "2252242",
      "market_url": "https://polymarket.com/event/fed-decision-in-september-762",
      "matched_on": [
        "polymarket"
      ],
      "no_price": 0.9985,
      "open_interest": null,
      "question": "Will the Fed decrease interest rates by 50+ bps after the September 2026 meeting?",
      "scraped_at": "2026-10-16T02:46:40.022938Z",
      "series": null,
      "source_url": "https://gamma-api.polymarket.com/markets?id=2252242",
      "spread": null,
      "status": "active",
      "subtitle": "50+ bps decrease",
      "ticker": "will-the-fed-decrease-interest-rates-by-50-bps-after-the-september-2026-meeting-863",
      "venue": "polymarket",
      "volume": 13532121.840784997,
      "yes_price": 0.0015
    },
    {
      "category": "Economics",
      "city": null,
      "close_time": "2026-09-16T17:59:00Z",
      "counterpart_market_id": null,
      "event_ticker": "KXFEDDECISION-26SEP",
      "implied_probability": 0.01,
      "liquidity": 0,
      "market_id": "KXFEDDECISION-26SEP-C25",
      "market_url": null,
      "matched_on": [
        "kalshi"
      ],
      "no_price": 1,
      "open_interest": 6296989.75,
      "question": "Will the Federal Reserve Cut rates by 25bps at their September 2026 meeting?",
      "scraped_at": "2026-10-16T02:46:40.011943Z",
      "series": "KXFEDDECISION",
      "source_url": "https://api.elections.kalshi.com/trade-api/v2/markets/KXFEDDECISION-26SEP-C25",
      "spread": null,
      "status": "active",
      "subtitle": "Cut 25bps",
      "ticker": "KXFEDDECISION-26SEP-C25",
      "venue": "kalshi",
      "volume": 6822495.24,
      "yes_price": 0.01
    }
  ],
  "service": "prediction-markets"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.scrapebench.dev/v1/prediction-markets' \
  -H 'content-type: application/json' \
  --data-raw '{"query":"fed","venue":"both"}'

# 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 - -X POST 'https://api.scrapebench.dev/v1/prediction-markets' \
  -H 'content-type: application/json' \
  --data-raw '{"query":"fed","venue":"both"}' \
  | 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 $0.06 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.06" });
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 $0.06 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.scrapebench.dev%2Fv1%2Fprediction-markets&method=POST
const res = await pay("https://api.scrapebench.dev/v1/prediction-markets", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "query": "fed",
    "venue": "both"
  }),
});
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 $0.06 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.06"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.scrapebench.dev/v1/prediction-markets",
        json={
            "query": "fed",
            "venue": "both",
        },
    )
    print(res.status_code, res.text)