Kalshi live data behind an event

The live feed a Kalshi event settles on, from Kalshi's free live_data tier: a crypto event returns the CF Benchmarks price series, candlesticks (15M, 1M) and the maturity time; an economic-data event (CPI, jobs) returns the provider's series with the target period. Send POST /api/kalshi-live-data with no required fields (4 optional) and pay $0.002 per call over x402 or MPP (there is no free tier). It returns a JSON object with eventTicker, type, isHistorical, defaultRange, rangeOptions and 10 more.

Pass an eventTicker, or a seriesTicker (e.g. KXBTC) and the soonest open event is resolved for you. The type field names the schema of details.

Category: Crypto & onchain data · Tags: kalshi live-data prediction-market settlement price-feed

TRY IN PLAYGROUND →

Parameters

Example request

curl -i -X POST https://agent402.tools/api/kalshi-live-data \
  -H "Content-Type: application/json" \
  -d '{"seriesTicker":"KXBTC","limit":5}'

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

Example response

{
  "eventTicker": "KXBTC-26SEP1817",
  "type": "crypto",
  "isHistorical": false,
  "defaultRange": "1h",
  "rangeOptions": [
    "15min",
    "1h",
    "3h"
  ],
  "coin": "BTC",
  "maturityTime": "2026-09-18T21:00:00.000Z",
  "latest": {
    "time": "2026-09-18T16:22:00.000Z",
    "value": 80867.31
  },
  "seriesCount": 5,
  "series": [
    {
      "time": "2026-09-18T16:22:00.000Z",
      "value": 80867.31
    }
  ],
  "candlesticks": [
    {
      "interval": "15M",
      "count": 5,
      "candles": [
        {
          "time": "2026-09-18T16:15:00.000Z",
          "open": 80703.13,
          "high": 80868.42,
          "low": 80664.65,
          "close": 80867.31
        }
      ]
    }
  ],
  "details": {
    "event_ticker": "KXBTC-26SEP1817",
    "coin": "BTC",
    "maturity_ts_ms": 1789765200000
  },
  "resolvedFrom": {
    "seriesTicker": "KXBTC",
    "title": "BTC price range on Sep 18, 2026 at 5pm EDT?",
    "strikeDate": "2026-09-18T21:00:00Z"
  },
  "range": null,
  "source": "kalshi"
}

From an MCP client

catalog.call {
  "slug": "kalshi-live-data",
  "params": {
    "seriesTicker": "KXBTC",
    "limit": 5
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for kalshi-live-data; 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-live-data 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-live-data", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "seriesTicker": "KXBTC",
    "limit": 5
  }),
});

Related tools