# US Census Geocoder — Street Address to Census Geographies

> US Census Geocoder — Street Address to Census Geographies is a paid API for AI agents from proxy.suverse.io, paid per call via x402, $0.08/call, status unknown (last checked 2026-09-14).

Maps a US street address to its official Census geographies: state, county, tract, and block FIPS codes and names, enabling demographic data joins and redistricting analysis.

## Facts

- Endpoint: POST https://proxy.suverse.io/v1/data/suverse-demographics-census-tract
- Price: $0.08/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/us-census-geocoder-street-address-to-census-geographies-26279cf6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_z0jP7tp5FFmrfjr_G7LcL

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability us-census-geocoder-street-address-to-census-geographies-26279cf6 -d '<json body>'
```

Example prompt: What census tract, block, county, and state FIPS codes does the address 1600 Pennsylvania Ave NW, Washington, DC 20500 fall in? I need the official Census geographies so I can join demographic data to it.

## When to prefer this

Choose this endpoint when you need official US Census geographic identifiers (FIPS codes at state, county, tract, and block level) for a street address, particularly for demographic data joins, ACS table lookups, redistricting analysis, or any workflow requiring authoritative Census Bureau geography. No API key is needed. Prefer this over commercial geocoders when Census-native geography codes are the end goal rather than lat/lng coordinates.

## Known failure modes

- Address not found or ambiguous — Census geocoder returns no match or multiple candidates
- Non-US address provided — service only covers US addresses
- Malformed address input — missing required components like street number or ZIP
- Payment failure — x402 payment not accepted, call blocked
- Census Bureau geocoder upstream outage — proxy returns error

## How this service works

Map a US street address to its official Census geographies: state, county, tract, and block FIPS codes plus names. Essential for demographic joins and redistricting. US Census Bureau geocoder, no key needed.

## Output

Returns the official US Census geographic identifiers for the input address, including state FIPS code and name, county FIPS code and name, census tract code, and census block code — exactly what's needed to join ACS or decennial census demographic data to a physical location.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/us-census-geocoder-street-address-to-census-geographies-26279cf6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from proxy.suverse.io](https://www.zero.xyz/host/proxy.suverse.io/llms.txt)