# US Geographic FCC Census Block Lookup

> US Geographic FCC Census Block Lookup is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).

Looks up US state, county, and FCC census block FIPS codes for a given geographic coordinate or location input

## Facts

- Endpoint: GET https://anibalb.duckdns.org/x402/us-geo-fcc?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/us-geographic-fcc-census-block-lookup-9aabacab
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cWAHANdJqb_IZ-qYtnO1S

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-geographic-fcc-census-block-lookup-9aabacab
```

Example prompt: What US state, county, and FCC census block FIPS codes correspond to the coordinates 40.7128° N, 74.0060° W?

## When to prefer this

Use this endpoint when you need authoritative FCC census block and FIPS code lookups for US coordinates — especially for telecom regulatory filings, broadband mapping, census data enrichment, or any workflow requiring official US administrative boundary classification from a lat/lng point. Prefer this over general reverse-geocoding when the specific FCC block FIPS code is required.

## Known failure modes

- Coordinates outside the United States return no results or an error
- Missing or malformed latitude/longitude parameters cause a 400-level error
- Coordinates on exact boundary edges may return unexpected county assignments
- Payment failure via x402 returns a 402 response before the lookup executes

## How this service works

Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.

## Output

Returns a JSON object with the US state name and FIPS code, county name and FIPS code, and the full 15-digit FCC census block FIPS code for the queried geographic 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "state": {
   "fips": "36",
   "name": "New York"
  },
  "county": {
   "fips": "36061",
   "name": "New York County"
  },
  "block_fips": "360610031002008"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/us-geographic-fcc-census-block-lookup-9aabacab/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from anibalb.duckdns.org](https://www.zero.xyz/host/anibalb.duckdns.org/llms.txt)