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Polyform Reverse Geocoding API
x402
Polyform Reverse Geocoding API is a paid API for AI agents from api.polyform.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Converts a geographic coordinate (lat/lng) to US administrative location data including state, county, and census tract
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call data endpoints for AI agents. USDC on Base via x402. No account, no API key — one micropayment per call.
Output
A JSON object containing the US state name, county name, and census tract code (FIPS-style tract identifier) for the provided coordinate, e.g. {"state": "Tennessee", "county": "Davidson County", "tract": "016300"}.
Example use cases
Enrich delivery address with county info
“I have a delivery drop point at 40.7128° N, 74.0060° W — what US state and county does that fall in, and what's the census tract?”
Compliance tagging for financial records
“For regulatory reporting I need the state, county, and census tract for the coordinate 34.0522° N, 118.2437° W — can you look that up?”
Geolocate a sensor reading
“My IoT sensor just reported a GPS fix at 41.8827° N, 87.6233° W — which US county and census tract is it in?”
Technical details
Endpoint
GEThttps://api.polyform.org/v1/geo/reverseWhen to prefer
Choose this endpoint when you need lightweight, pay-per-call US reverse geocoding without account setup or API key management. It returns structured administrative identifiers (state, county, census tract) rather than full street addresses, making it ideal for compliance tagging, demographic enrichment, or census analysis workflows. Prefer this over full geocoding services when you only need administrative region classification and want zero-friction micropayment access via USDC on Base.
Side effects
- Coordinate outside the US returns no result or an error — endpoint only covers US geography
- Missing or malformed lat/lng query parameters result in a 400 bad request
- Payment failure (insufficient USDC balance or x402 protocol error) blocks the call
- Coordinates on exact administrative boundary edges may resolve ambiguously
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"state": "Tennessee",
"tract": "016300",
"county": "Davidson County"
}
}Tags
x402
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