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Kalshi Weather Index

by Kalshi city temperature index in Weather & location

x402 APIPassing, checked 48 min ago

Kalshi's own minute-resolution city temperature index (Fahrenheit), the series its hourly temperature markets settle on, computed from weighted member stations. 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.

POST
https://agent402.tools/api/kalshi-weather-index
Price
$0.002
per call in USDC
Uptime
100%
last 30 days
Response time
272 ms
409 ms slowest 5%
Last check
Passed
48 min ago, next any minute now

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://agent402.tools/api/kalshi-weather-index

Each call costs $0.002 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://agent402.tools/api/kalshi-weather-index
content-type: application/json

{
  "city": "miami",
  "lastSec": 3600,
  "limit": 5
}

Parameters

ParameterTypeRequiredDescription
citystringYesKalshi index city id, e.g. miami, nyc, chicago, sf-bay.
detailedbooleanNoInclude every member station's reading and QC code on each point.
fromnumberNoWindow start, unix milliseconds (pair with to).
includeCalibrationsbooleanNoAlso return the city's published calibration timeline (station weights and offsets).
lastSecnumberNoTrailing window in seconds (default 3600, max 604800). Ignored when from/to are given.
limitnumberNoNewest points to return (default 1440, max 10000).
tonumberNoWindow end, unix milliseconds (pair with from).

Example response

The provider's example. We can't check it without paying.

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

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.002.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agent402.tools/api/kalshi-weather-index' \
  -H 'content-type: application/json' \
  --data-raw '{"city":"miami","lastSec":3600,"limit":5}'

# 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://agent402.tools/api/kalshi-weather-index' \
  -H 'content-type: application/json' \
  --data-raw '{"city":"miami","lastSec":3600,"limit":5}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// 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 $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
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 $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Fkalshi-weather-index&method=POST
const res = await pay("https://agent402.tools/api/kalshi-weather-index", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "city": "miami",
    "lastSec": 3600,
    "limit": 5
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# 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 $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://agent402.tools/api/kalshi-weather-index",
        json={
            "city": "miami",
            "lastSec": 3600,
            "limit": 5,
        },
    )
    print(res.status_code, res.text)

Security scan

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