Look up or search NAICS 2022 industry classification codes (US Census Bureau, public domain). Pass `code` for an exact NAICS code — 2–6 digits or a combined sector like 31-33 — and get its official title, hierarchy path, full official description, activity index terms, and direct child codes. Or pass `query` for free-text search (e.g. 'software publishers', 'coffee shop') over titles plus the official ~20k-entry activity index → ranked candidate codes, optionally filtered by `level` (2=sector … 6=national industry). Ground truth for industry coding in KYC, business registration, government filings, and ERP vendor/customer setup.
/api/business/naicsPAYMENT-SIGNATURE.The naics API is a pay-per-call business endpoint built for AI agents and autonomous software. Look up or search NAICS 2022 industry classification codes (US Census Bureau, public domain).
There is no signup and no API key. An agent (or any HTTP client) hits the endpoint, receives an x402 "402 Payment Required" challenge, signs a sub-cent USDC payment on Base or Solana, and retries — the data comes back on the paid request. That makes it a drop-in naics data source for an agent tool-use loop, an MCP host, or a backend that needs business data on demand without onboarding to yet another vendor portal.
| Name | Type | Description |
|---|---|---|
code | string | Exact NAICS code (2–6 digits, or a combined sector range like 31-33). XOR with query. match ^(\d{2}-\d{2}|\d{2,6})$ |
query | string | Free-text industry or activity description to search. XOR with code. min 2 chars · max 120 chars |
level | integer | Search mode only: restrict results to one hierarchy level (2=sector … 6=national industry). min 2 · max 6 |
limit | integer | Search mode only: max results, 1–50, default 20. min 1 · max 50 |
# 1. Probe with no auth → 402 envelope with PaymentRequirements curl -sS 'https://2s.io/api/business/naics?code=example&query=xx&level=2&limit=1' # 2. Sign + retry with PAYMENT-SIGNATURE: curl -sS 'https://2s.io/api/business/naics?code=example&query=xx&level=2&limit=1' \ -H 'PAYMENT-SIGNATURE: <base64-json-payload>' # Or use the canonical runner (handles probe → sign → retry): # EVM_PRIVATE_KEY=0x... node --env-file=.env.local \ # --experimental-strip-types scripts/x402-pay.ts \ # 'https://2s.io/api/business/naics?code=example&query=xx&level=2&limit=1'
import { TwoS } from '@2sio/sdk'
const client = new TwoS({
privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})
const result = await client.business.naics({
"code": "example",
"query": "xx",
"level": 2,
"limit": 1
})
console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)import os
from twosio import TwoS
client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])
result = client.business.naics(code="example", query="xx", level=2, limit=1)
print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)// 1. Add @2sio/mcp to your MCP host config (Claude Desktop example below).
// EVM_PRIVATE_KEY funds x402 payments per call.
// claude_desktop_config.json
{
"mcpServers": {
"2sio": {
"command": "npx",
"args": ["-y", "@2sio/mcp"],
"env": { "EVM_PRIVATE_KEY": "0x..." }
}
}
}
// 2. Once the server is running, agents call this tool via standard MCP:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "business.naics",
"arguments": {
"code": "example",
"query": "xx",
"level": 2,
"limit": 1
}
}
}| Field | Type | Description |
|---|---|---|
ok | boolean | one of: true |
items | array | |
total | integer | Total matching rows upstream; null when unknown. |
source | object | |
page | object |
{
"ok": true,
"items": [
{
"code": "example",
"level": 1,
"title": "example",
"heading": "example",
"description": "example",
"indexTerms": [
"example"
]
}
],
"total": 1,
"source": {
"provider": "example",
"url": "example",
"license": "example"
},
"page": {
"number": 1,
"size": 1,
"pages": 1
}
}