# fittings NAICS Lookup

> fittings NAICS Lookup is a paid API for AI agents from fittings.sh, paid per call via x402, $0.00398/call, status unknown (last checked 2026-09-14).

Looks up a NAICS industry code and its parent hierarchy, or searches NAICS industry titles by text query.

## Facts

- Endpoint: GET https://fittings.sh/v1/naics/lookup
- Price: $0.00398/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fittings-naics-lookup-d1d19af3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GFwaRDBFh1G3HKNMrrZ2p

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 fittings-naics-lookup-d1d19af3
```

Example prompt: Can you look up the NAICS code 541511 and show me its full parent hierarchy?

## When to prefer this

Use this endpoint when you need to look up or validate a specific NAICS code, retrieve its full industry hierarchy, or find NAICS codes matching a keyword or industry description. Prefer this over generic web searches when you need structured, authoritative NAICS classification data for business registration, regulatory filings, market research, or supplier classification.

## Known failure modes

- Invalid or non-existent NAICS code returns no results or an error
- Text search with no matching titles returns an empty results list
- Limit parameter out of range (not 1-50) may return a validation error
- Ambiguous query with mode='auto' may incorrectly interpret a numeric string as a code rather than text

## How this service works

Looks up a NAICS industry code and its parent hierarchy, or searches NAICS industry titles by text.

## Output

Returns one or more NAICS industry records including the code, title, and parent hierarchy (sector, subsector, industry group, and industry level codes and titles), depending on whether the query was a code lookup or text search.

## 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": [
      "query"
     ],
     "properties": {
      "mode": {
       "type": "string",
       "description": "'code', 'text' or 'auto' (default)"
      },
      "limit": {
       "type": "number",
       "description": "1-50, default 10"
      },
      "query": {
       "type": "string",
       "description": "A NAICS code such as 541511, or text such as \"software\""
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fittings-naics-lookup-d1d19af3/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)