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Weather Observed Temperatures for Prediction Markets (Kalshi & Polymarket)
x402
Weather Observed Temperatures for Prediction Markets (Kalshi & Polymarket) is a paid API for AI agents from weather-x402.linholiday.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).
Returns observed temperature readings (max/min/latest) for a given ICAO weather station, structured for Kalshi and Polymarket temperature market settlement.
Price / call$0.01
Success—
StatusUnknown
How this service works
Paid calls cost 0.01-0.02 USDC on eip155:8453 via x402 (exact scheme). Free: /stations, /preview/*, /health, /, /openapi.json, /llms.txt, /.well-known/x402.
Output
Returns a JSON object containing the ICAO station ID, local date, and a 'windows' object with a 'kalshi_climate_day' entry that includes: number of observations, latest temperature reading (°C and °F with timestamp), best-estimate max and min temperatures (°C, °F, and whole-number °F), and the raw max and min across all METAR reports (with timestamps and report types).
Example use cases
Kalshi temperature market settlement check
“Pull the observed max and min temperatures for KMDW today so I can see if my Kalshi temperature market contract settles in the money.”
Polymarket daily high verification
“What was the highest recorded temperature at KLGA today according to METAR reports? I need it in Fahrenheit for my Polymarket temperature prediction.”
International station temperature lookup
“Get me today's observed temperature readings — high, low, and latest — for EGLC in London so I can verify a temperature market settlement.”
Technical details
Endpoint
GEThttps://weather-x402.linholiday.workers.dev/observed?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need structured, prediction-market-ready observed temperature data (max/min/latest) from METAR reports at a specific ICAO station, particularly for settling Kalshi or Polymarket temperature contracts. Prefer this over generic weather APIs when you need the exact Kalshi climate day window format with whole-number Fahrenheit values, or when you need micropayment-compatible access (x402/USDC) without API key registration. Choose it over forecast APIs when you need historical or current-day observed actuals, not predictions.
Side effects
- Invalid or unknown ICAO station ID returns an error or empty windows
- Station not reporting — no recent METAR data may result in zero observations or missing best_estimate
- Endpoint requires payment via x402 (0.01-0.02 USDC on Base/eip155:8453); unpaid requests return HTTP 402
- Data may lag real-time by up to one observation cycle (~1 hour) for recently updated stations
- Station IDs must be in ICAO format (e.g. KMDW, not ORD); IATA codes will fail
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"station": "KNYC",
"windows": {
"kalshi_climate_day": {
"n_obs": 10,
"latest": {
"c": 11.1,
"f": 52,
"time": "2026-10-21T13:51:00.000Z"
},
"best_estimate": {
"max": {
"c": 12.2,
"f": 54,
"f_whole": 54
},
"min": {
"c": 8.3,
"f": 46.9,
"f_whole": 47
}
},
"max_all_reports": {
"c": 11.1,
"f": 52,
"time": "2026-10-21T13:51:00.000Z",
"type": "METAR"
},
"min_all_reports": {
"c": 8.3,
"f": 46.9,
"time": "2026-10-21T09:51:00.000Z",
"type": "METAR"
}
}
},
"local_date": "2026-10-21"
}
}Tags
x402
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