NTS

NTS Business Registration Verification and Status Lookup Service

NTS business-registration verification (validate) plus status lookup (status). Call directly with GET /api/bizinfo with no auth key (action=status for status lookup, action=validate for verification). The server already has an odcloud key registered, so calls work immediately. Provides active/dormant/closed status, tax type (general/simplified/tax-free), and match results (valid 01 match / 02 mismatch).

⚡ Business registration verification/status quick call

GET /api/bizinfo?action=status&b_no=1234567890

Use this URL first for business status and verification. No auth key required; action=status|validate. Server key already registered, so calls work immediately.

What agents get

b_stt (active/dormant/closed), b_stt_cd, tax_type (tax-type text), tax_type_cd, end_dt (closure date), utcc_yn (unit-taxation switch), tax_type_change_dt, invoice_apply_dt / valid (01 match / 02 mismatch), valid_msg
Business-partner status checks, dormant/closed verification, invoice-eligibility decisions, and authenticity checks on ID, opening date, and owner name

Use cases

Look up active/dormant/closed status by business number
Check tax type (general/simplified/tax-free)
Verify business number plus opening date plus owner name

Registered APIs (2)

Business Status Lookup status

Look up registration status by business number. Up to 10 numbers per call (100 in the source API; quick-API limit). Unregistered numbers return "not registered with NTS" in tax_type

b_no Required — 10-digit business registration number without hyphens; multiple numbers separated by spaces or commas e.g. 1234567890

Returns: match_cnt (match count), items[] (b_no/b_stt/b_stt_cd/tax_type/tax_type_cd/end_dt/utcc_yn/tax_type_change_dt/invoice_apply_dt)

Rate limit: 1,000 calls/day (odcloud base quota; see the odcloud usage page for exact limits)

Business Registration Verification validate

Verify that business number, opening date, and owner name match. One record per call. valid is 01 on match and 02 on mismatch

b_no Required — 10-digit business registration number e.g. 1234567890
start_dt Required — Opening date YYYYMMDD e.g. 20200101
p_nm Required — Owner name (1-30 chars) e.g. 홍길동

Returns: valid (01 match / 02 mismatch), valid_msg (tax-type phrase on match)

Rate limit: 1,000 calls/day (odcloud base quota; see the odcloud usage page for exact limits)

Auth · pricing · terms

Auth	ServiceKey — odcloud service key (serviceKey query). Stored only on the proxy server and never exposed to agents. Agents call only our quick API (/api/bizinfo).
Pricing	Free. Development account auto-approved
License	Public data (follow the data.go.kr application terms; attribution required)
Redistribution	Allowed (attribution required)
Terms checked	2026-10-13
Apply	Log in to data.go.kr -> Apply for the NTS_Business Registration Verification and Status Lookup Service -> Service key issued (development account auto-approved) Portal
Status	Active
Last checked	2026-10-13

How agents call

Call through our proxy. Start with the keyless quick API shown above (no token needed). For the keyed proxy, send X-Agent-Token to POST /agencatalog/api/call with ('service', 'endpoint', 'params'). The full service list is at /agencatalog/api/services.json.

Machine-readable JSON schema

{
  "service": "nts-bizinfo-validate",
  "name": "NTS Business Registration Verification and Status Lookup Service",
  "provider": "NTS",
  "apis": [
    {
      "id": "status",
      "name": "Business Status Lookup",
      "params": [
        {
          "name": "b_no",
          "required": true,
          "example": "1234567890",
          "desc": "10-digit business registration number without hyphens; multiple numbers separated by spaces or commas"
        }
      ]
    },
    {
      "id": "validate",
      "name": "Business Registration Verification",
      "params": [
        {
          "name": "b_no",
          "required": true,
          "example": "1234567890",
          "desc": "10-digit business registration number"
        },
        {
          "name": "start_dt",
          "required": true,
          "example": "20200101",
          "desc": "Opening date YYYYMMDD"
        },
        {
          "name": "p_nm",
          "required": true,
          "example": "홍길동",
          "desc": "Owner name (1-30 chars)"
        }
      ]
    }
  ],
  "proxy_call": "POST /agencatalog/api/call",
  "attribution": "Source: NTS Business Registration Verification and Status Lookup Service (Public Data Portal data.go.kr, via odcloud)"
}

Notes

API keys live only on the server. Clients asking for keys directly cannot use this route.
Each provider has a daily quota. Over-quota calls return 429 and are blocked.
Provider outages or over-quota errors are passed through. Check the error field before retrying.
Attribution: Source: NTS Business Registration Verification and Status Lookup Service (Public Data Portal data.go.kr, via odcloud)

Last checked: 2026-10-13

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