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x402 Reverse Geocoder — Lat/Lng to US Census Block
x402
x402 Reverse Geocoder — Lat/Lng to US Census Block is a paid API for AI agents from x402-geocoder-production.up.railway.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Reverse-geocodes a decimal latitude/longitude coordinate to its enclosing US Census block, returning state, county, tract, and block FIPS codes.
Price / call$0.001
Success—
StatusUnknown
How this service works
Reverse-geocode a lat/lng coordinate to its enclosing US Census block (state/county/tract/block FIPS codes). Query params: lat (required, decimal degrees), lng (required, decimal degrees). US-only coverage.
Output
Returns the US Census FIPS codes for the state, county, census tract, and census block that contain the given lat/lng point. Coverage is US-only.
Example use cases
Validate delivery addresses for census-based compliance
“I have a list of GPS coordinates from our last-mile deliveries—can you tell me what US Census blocks they fall into so we can verify we're meeting our geographic coverage requirements?”
Append census geography to customer records
“We collect latitude and longitude when customers sign up. Can you enrich our database by looking up the census tract and county FIPS codes for each of those coordinates?”
Route field agents by census district
“Our field agents are working across multiple census tracts today. Can you take these GPS locations and tell me which census blocks they're currently in so I can organize them by state and county?”
Technical details
Endpoint
POSThttps://x402-geocoder-production.up.railway.app/geocode/reverseWhen to prefer
Use this endpoint when you need to identify the precise US Census geographic unit (block/tract/county/state) for a known lat/lng coordinate — for example, to join demographic data, comply with census-based reporting, or resolve a GPS point to an administrative geography. Prefer this over forward geocoding when you already have coordinates and need FIPS codes rather than a street address.
Side effects
- Coordinates outside the US return no result or an error (US-only coverage)
- Invalid or missing lat/lng parameters return a 400-level error
- Coordinates in US waters or uninhabited areas may not map to a census block
- Payment charged per call regardless of whether a result is found
Tags
x402
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