Kalshi event detail

Get full detail for a single Kalshi event with all its nested markets. Send POST /api/kalshi-event with the required field eventTicker and pay $0.002 per call over x402 or MPP (there is no free tier). It returns a JSON object with eventTicker, title, subTitle, seriesTicker, category and 4 more.

Mutually-exclusive flag tells you whether the markets partition outcome space (e.g. one winner). Useful for: viewing all candidates in an election, all CPI ranges, all weather buckets.

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

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Parameters

Example request

curl -i -X POST https://agent402.tools/api/kalshi-event \
  -H "Content-Type: application/json" \
  -d '{"eventTicker":"KXELONMARS-99"}'

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

Example response

{
  "eventTicker": "PRES-24",
  "title": "2026 US Presidential election",
  "subTitle": "Who will win?",
  "seriesTicker": "PRES",
  "category": "Politics",
  "mutuallyExclusive": true,
  "marketCount": 2,
  "markets": [
    {
      "ticker": "PRES-24-DEM",
      "eventTicker": "PRES-24",
      "title": "Will the Democratic nominee win?",
      "status": "open",
      "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-event",
  "params": {
    "eventTicker": "KXELONMARS-99"
  }
}

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

Errors and behavior

• eventTicker is required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• 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-event 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-event", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "eventTicker": "KXELONMARS-99"
  }),
});

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