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d21 address_geocode
x402
d21 address_geocode is a paid API for AI agents from draconic21-x402-api.onrender.com, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-12).
Forward and reverse U.S. address geocoding powered by the U.S. Census Bureau's free Geocoder API, returning standardized coordinates and address components.
Price / call$0.008
Success—
StatusUnknown
How this service works
Address Geocode ($0.008 — below the category-leading "geocoding" comparable's $0.01): forward + reverse U.S. geocoding in one route, built entirely on the U.S. Census Bureau's free, keyless Geocoder API (a federal government service, not a resold third-party product). Accepts `q` as an alias for `address` (the leading comparable's exact param name), and every response carries an additive `count`/`items[]` block in that comparable's field-name shape. Body { address (or q) } for forward…
Output
Returns a structured response with a count of matched results and an items array. Each item contains the matched/normalized address string, latitude, longitude, and address component fields (street, city, state, zip), shaped to be compatible with leading geocoding API response formats.
Example use cases
Forward geocode a delivery address
“I need the exact GPS coordinates for '350 Fifth Avenue, New York, NY 10118' — can you look that up and return the latitude and longitude?”
Reverse geocode a GPS pin drop
“I have coordinates 38.8897 latitude and -77.0089 longitude — can you find out what street address those map to in the US?”
Enrich customer records with coordinates
“I have a customer record with the address '4600 Silver Hill Rd, Washington, DC 20233' and I need to add its lat/lon coordinates to the record — can you geocode that for me?”
Technical details
Endpoint
POSThttps://draconic21-x402-api.onrender.com/v1/address_geocode?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need U.S.-only geocoding at low cost ($0.008/call) without an API key, backed directly by the U.S. Census Bureau's authoritative federal dataset. Prefer it over commercial geocoders (Google Maps, HERE, Mapbox) when cost, keyless access, or U.S. government data provenance matters. Ideal for agents processing U.S. addresses in bulk or enriching records where international geocoding is not needed.
Side effects
- Address not found in Census Bureau database — returns zero-count results array
- Invalid or non-U.S. address provided — Census Geocoder only covers U.S. addresses
- Malformed input — missing both address/q and lat/lon fields
- Mutually exclusive parameters provided together (address + lat/lon) — undefined behavior
- Census Bureau upstream API downtime — service unavailable error
- Non-street-level address (PO Box, rural route) may return no match
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| q | string | Alias for `address` (compatibility with the leading comparable's param name) — provide one or the other, not both. |
| lat | number | Latitude for reverse geocoding (requires lon). Mutually exclusive with address. |
| lon | number | Longitude for reverse geocoding (requires lat). Mutually exclusive with address. |
| address | string | Free-text U.S. street address for forward geocoding, e.g. '4600 Silver Hill Rd, Washington, DC 20233'. Mutually exclusive with lat/lon. |
Tags
x402
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