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SiteCheck US Geocode
x402
SiteCheck US Geocode is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-19).
Geocodes a US address string to latitude/longitude coordinates with Census tract, county FIPS, and state data using the US Census Bureau geocoder.
Price / call$0.001
Success—
StatusUnknown
How this service works
Geocodes a one-line US address with the US Census Bureau: matched address, coordinates, county, state, census tract and block group. Addresses that do not match answer 404 (not charged). Public domain data.
Output
Returns a JSON object with latitude, longitude, matched address string, state name, county name, state FIPS code, county FIPS code, census tract, block group, the original query, the Census Bureau source URL, and a timestamp of when the lookup was performed.
Example use cases
Enrich customer address with coordinates
“I have a customer address — '350 Fifth Avenue, New York, NY 10118' — can you look up its latitude, longitude, and census tract so I can store it in our database?”
Verify and standardize a mailing address
“Can you check whether '742 Evergreen Terrace, Springfield, IL 62701' is a valid US address and return the matched standardized form with county and state FIPS codes?”
Find census geography for a business location
“I need the census tract and county FIPS code for our new office at '500 Boylston Street, Boston, MA 02116' — can you geocode it using the Census Bureau?”
Technical details
Endpoint
GEThttps://api.sitecheck-api.workers.dev/api/us-geocode?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need authoritative US address geocoding tied to Census Bureau geographies (tract, county FIPS, state FIPS) at very low cost ($0.001/call). Ideal for compliance workflows, demographic enrichment, or any use case requiring official Census identifiers alongside coordinates. Prefer over generic geocoding APIs when Census tract or FIPS codes are required outputs.
Side effects
- Address not found or unrecognized — Census geocoder returns no match
- Malformed or non-US address input — may return null coordinates
- Missing required 'address' query parameter — request fails validation
- Census Bureau geocoder upstream outage — service temporarily unavailable
- Ambiguous address with multiple possible matches — only top match returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"lat": 38.898702605245,
"lon": -77.035189204737,
"query": "1600 Pennsylvania Ave NW, Washington, DC 20500",
"state": "District of Columbia",
"county": "District of Columbia",
"source": "https://geocoding.geo.census.gov/geocoder/geographies/onelineaddress",
"checkedAt": "2026-10-14T07:00:44.072Z",
"stateFips": "11",
"blockGroup": null,
"countyFips": "11001",
"attribution": "US Census Bureau (public domain)",
"censusTract": "980000",
"matchedAddress": "1600 PENNSYLVANIA AVE NW, WASHINGTON, DC, 20500"
}
}Tags
x402
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