Kalshi city temperature index

Kalshi's own minute-resolution city temperature index (Fahrenheit), the series its hourly temperature markets settle on, computed from weighted member stations. Send POST /api/kalshi-weather-index with the required field city and pay $0.002 per call over x402 or MPP (there is no free tier). It returns a JSON object with city, units, configVersion, count, totalInWindow and 5 more.

Ask for a trailing window (lastSec, default one hour, max 7 days) or a from/to window; detailed adds every station's reading per minute; includeCalibrations adds the published station-weight and offset timeline. Cities: miami, dfw, houston, phl-delaware-valley, puget-sound, sf-bay, greater-boston, southeast-michigan, kansas-city, minneapolis-st-paul, nyc, chicago, la-coastal. Free keyless Kalshi live_data.

Category: Crypto & onchain data · Tags: kalshi weather temperature live-data prediction-market

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Parameters

Example request

curl -i -X POST https://agent402.tools/api/kalshi-weather-index \
  -H "Content-Type: application/json" \
  -d '{"city":"miami","lastSec":3600,"limit":5}'

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

Example response

{
  "city": "miami",
  "units": "fahrenheit",
  "configVersion": "miami-temperature-v1.0-cal-20260914",
  "count": 5,
  "totalInWindow": 60,
  "latest": {
    "time": "2026-09-18T16:22:00.000Z",
    "valueF": 84.2,
    "contributors": 5,
    "status": "normal"
  },
  "minF": 84.2,
  "maxF": 85.28,
  "points": [
    {
      "time": "2026-09-18T16:18:00.000Z",
      "valueF": 85.28,
      "contributors": 5,
      "status": "normal"
    }
  ],
  "source": "kalshi"
}

From an MCP client

catalog.call {
  "slug": "kalshi-weather-index",
  "params": {
    "city": "miami",
    "lastSec": 3600,
    "limit": 5
  }
}

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

Errors and behavior

• city 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-weather-index 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-weather-index", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "city": "miami",
    "lastSec": 3600,
    "limit": 5
  }),
});

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