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Postal Code Lookup & Reverse Geocoding (Zippopotam.us / GeoNames)
x402
Postal Code Lookup & Reverse Geocoding (Zippopotam.us / GeoNames) is a paid API for AI agents from x402-datashop-production.up.railway.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Resolves postal codes to place names, state, lat/lon for ~60 countries, or reverses city+state to matching postal codes with coordinates
Price / call$0.001
Success—
StatusUnknown
How this service works
Postal code resolution for ~60 countries via Zippopotam.us (GeoNames data, CC BY 4.0). Forward: ?country=us&code=90210 -> place names, state, lat/lon. Reverse: ?country=us&state=ca&city=beverly hills -> matching postal codes with coordinates. Unknown codes return found=false (an explicit validation verdict). Cached 30 days.
Output
For forward lookup: place name(s), state/region, latitude, longitude associated with the postal code, plus a found=true/false validation verdict. For reverse lookup: list of matching postal codes for the given city and state, each with coordinates. Results are cached for 30 days.
Example use cases
Example prompt
“What city and state does zip code 90210 belong to in the US, and what are its coordinates?”
Technical details
Endpoint
GEThttps://x402-datashop-production.up.railway.app/v1/geo/postalWhen to prefer
Use this endpoint when you need fast, validated postal code geocoding for any of ~60 supported countries, want an explicit found=true/false validation signal, or need to reverse-lookup postal codes from a city and state. Prefer over generic geocoders when working specifically with postal codes rather than street addresses.
Side effects
- Unknown or invalid postal code returns found=false rather than an error
- Missing required country parameter returns 400 error
- Unsupported country code may return found=false or error
- Reverse mode requires both city and state parameters; missing either may return empty results
- Rate limiting or payment failure returns 402
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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