# FCC Census Block Lookup by Coordinate

> FCC Census Block Lookup by Coordinate is a paid API for AI agents from fittings.sh, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).

Returns the 15-digit census block FIPS code, county and state codes, and block bounding box for a given US latitude/longitude coordinate.

## Facts

- Endpoint: GET https://fittings.sh/v1/fcc/census-block
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fcc-census-block-lookup-by-coordinate-d861011f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Dv6wlZqR1lwwbD4pEFvFr

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 fcc-census-block-lookup-by-coordinate-d861011f
```

Example prompt: What's the 15-digit census block FIPS code for the location at latitude 38.8977 and longitude -77.0366, and what county and state does it fall in?

## When to prefer this

Use this endpoint when you need authoritative FCC/Census-sourced census block FIPS codes for US coordinates, especially when you require the full 15-digit code with county and state breakdowns and the block bounding box. Prefer this over general geocoding APIs when the specific output needed is census geography identifiers rather than street addresses or place names.

## Known failure modes

- Coordinate outside the US returns no match or an error
- Missing lat or lon parameter returns a 400/validation error
- Invalid numeric values for lat/lon cause a schema validation failure
- Coordinate falls in a water body or offshore area with no census block assignment

## How this service works

The 15-digit census block FIPS code containing a US coordinate, with its county and state codes and the block bounding box.

## Output

Returns the 15-digit census block FIPS code (state + county + tract + block), the 2-digit state FIPS code, the 5-digit county FIPS code, and the geographic bounding box (min/max lat/lon) of the census block containing the queried coordinate.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "lat",
      "lon"
     ],
     "properties": {
      "lat": {
       "type": "number"
      },
      "lon": {
       "type": "number"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fcc-census-block-lookup-by-coordinate-d861011f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fittings.sh](https://www.zero.xyz/host/fittings.sh/llms.txt)