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Polyform Reverse Geocoder
x402
Polyform Reverse Geocoder is a paid API for AI agents from polyform.polyform-org.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Converts a geographic coordinate (latitude/longitude) to US Census Bureau administrative geography: state, county, census tract, and block.
Price / call$0.002
Success—
StatusUnknown
How this service works
Coordinates to US state, county, tract and block geography. Source: US Census Bureau. JSON.
Output
A JSON object containing the US Census Bureau administrative geography for the provided coordinate: state name and FIPS code, county name and FIPS code, census tract number, and census block number, all sourced from the Census Bureau's geographic data.
Example use cases
Enrich delivery address with census geography
“I have a GPS coordinate from a delivery stop at 37.7749° N, 122.4194° W — can you tell me what US state, county, census tract and block it falls in? I need the Census Bureau geography for compliance reporting.”
Identify district for voter registration tool
“Given the coordinate 38.8951° N, 77.0369° W, what county and census tract does it belong to? We need to know the administrative geography to route the voter to the right local office.”
Tag user location with census block for analytics
“A user's device reported coordinates 41.8781° N, 87.6298° W — look up the full US Census geography for that point so I can tag their session with state, county, tract, and block data.”
Technical details
Endpoint
GEThttps://polyform.polyform-org.workers.dev/v1/geo/reverseWhen to prefer
Use this endpoint when you need authoritative US Census Bureau geographic hierarchy (state, county, tract, block) from a coordinate — ideal for compliance, demographic analysis, voter routing, or enriching location data with FIPS codes. Prefer over commercial geocoders when Census Bureau accuracy and official administrative boundaries are required and the location is within the continental US.
Side effects
- Coordinate outside the US returns no match or empty result
- Invalid or missing latitude/longitude parameters returns an error
- Coordinates in US territories or unincorporated areas may not match all geography levels
- Rate limiting or payment failure returns 402 or 429 status
- Very remote areas may have tract/block data but no named county subdivision
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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