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SYNTHORA Historical Weather API
x402
SYNTHORA Historical Weather API is a paid API for AI agents from historical-weather.hergertsynthora.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-11).
Returns verified historical weather data (tmax, tmin, precipitation, max wind) for any location and date from 1940 to ~5 days ago using ERA5 reanalysis data
Price / call$0.03
Success—
StatusUnknown
How this service works
Live x402 resource on Base. POST /service; payment required responses use x402.
Output
A JSON object with ok: true, a niche field set to 'historical_weather', a result object containing historical weather variables (tmax, tmin, precipitation, max wind) for the queried location and date, and a cryptographic receipt with an ed25519 signature confirming the paid response.
Example use cases
Climate-market backtesting for quant fund
“Pull the daily tmax, tmin, precipitation, and max wind for Chicago from January 1 2000 through December 31 2005 — I need it for backtesting a commodity weather model.”
Insurance loss event verification
“What were the exact historical weather conditions — temperature range, rainfall, and wind — in New Orleans on August 29, 2005? I need to verify the data for a claims analysis.”
Agricultural yield research
“Get me the historical precipitation and temperature highs and lows for the Central Valley in California for every summer month from 1980 through 1990 — I'm correlating it with crop yield records.”
Technical details
Endpoint
POSThttps://historical-weather.hergertsynthora.com/service?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need verified, high-quality historical weather data derived from the ERA5 reanalysis dataset covering dates from 1940 to approximately 5 days ago. It is especially suited for climate-financial backtesting, insurance loss verification, agricultural research, or any use case requiring accurate tmax/tmin, precipitation, and wind data for arbitrary global locations and historical dates. Prefer this over forecast APIs (which only cover future conditions) and over scraped weather archives (which may lack ERA5's scientific rigor and global coverage).
Side effects
- Date out of range (before 1940 or within last 5 days) — returns error or empty result
- Invalid or unrecognized location string — may return error or null result
- Payment not completed — x402 payment required response returned
- Network or upstream ERA5 data unavailability — service timeout or error
- Malformed input string — missing location or date causes processing failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string | SYNTHORA historical-weather: verified historical weather for any place and date (1940 → ~5 days ago) from the ERA5 reanalysis — tmax/tmin, precipitation, max wind. For climate-market backtesting and c |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"niche": "historical_weather",
"result": {},
"receipt": {
"alg": "ed25519"
}
}
}Tags
x402
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