Kalshi markets list

List Kalshi markets (CFTC-regulated US event contracts). Send POST /api/kalshi-markets with no required fields (3 optional) and pay $0.002 per call over x402 or MPP (there is no free tier). It returns a JSON object with count, cursor, markets and source.

Filter by status (open/closed/settled/unopened) or by event ticker. Returns yes/no bid/ask, last price, volume, open interest, and the resting contract size at the best yes bid and ask (yesBidSize/yesAskSize). Covers US-regulated markets and Kalshi-only categories (weather, economic data).

Category: Crypto & onchain data · Tags: kalshi prediction-market regulated event-contracts cftc

TRY IN PLAYGROUND →

Parameters

Example request

curl -i -X POST https://agent402.tools/api/kalshi-markets \
  -H "Content-Type: application/json" \
  -d '{"status":"open","limit":5}'

Without payment this returns HTTP 402 Payment Required with the exact price for kalshi-markets; any x402 v2 or MPP client pays it and retries.

Example response

{
  "count": 1,
  "cursor": "next-page-token",
  "markets": [
    {
      "ticker": "PRES-24-DEM",
      "eventTicker": "PRES-24",
      "title": "Will the Democratic nominee win?",
      "subtitle": "2026 US Presidential election",
      "status": "open",
      "openTime": "2026-01-01T00:00:00Z",
      "closeTime": "2026-11-03T23:59:00Z",
      "yesBid": 0.45,
      "yesAsk": 0.47,
      "noBid": 0.53,
      "noAsk": 0.55,
      "lastPrice": 0.46,
      "volume": 12345,
      "openInterest": 5678,
      "yesBidSize": 471.53,
      "yesAskSize": 323.1,
      "venue": "kalshi",
      "venueUrl": "https://kalshi.com/markets/pres-24-dem"
    }
  ],
  "source": "kalshi"
}

From an MCP client

catalog.call {
  "slug": "kalshi-markets",
  "params": {
    "status": "open",
    "limit": 5
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for kalshi-markets; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• Every field is optional. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A GET or HEAD to /api/kalshi-markets returns the same 402 quote, so the price can be read without a body.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

Paid call (JavaScript agent)

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

const client = new x402Client();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/kalshi-markets", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "status": "open",
    "limit": 5
  }),
});

Related tools