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Korean Business Registration Status Lookup (NTS via x402)
x402
Korean Business Registration Status Lookup (NTS via x402) is a paid API for AI agents from x402-research.kgy5612.workers.dev, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).
Looks up Korean business registration status and tax type for one or more 10-digit business registration numbers via the National Tax Service (NTS) dataset, paid per-call with USDC on Base.
Price / call$0.03
Success—
StatusUnknown
How this service works
Call to check Korea NTS businessman open/closed + tax type JSON (휴폐업/과세유형). Official data.go.kr. Not a people search. Not tax advice.
Output
Returns a JSON object with an as-of date and an array of items, one per queried business number, each containing the business status in Korean (e.g. 계속사업자 = ongoing), a status code, tax type label and code, closure date if applicable, and unit consumer credit indicator. Also includes source metadata referencing the NTS dataset on data.go.kr and a caveat that results are not tax advice.
Example use cases
Vendor due diligence before payment
“Before I transfer funds to this Korean supplier, can you check their business registration number 214-87-12345 to confirm they're still an active registered business and not closed?”
Onboarding KYB check for Korean merchant
“We're onboarding a new Korean merchant with business registration number 101-81-99999 — can you verify their NTS registration status and tax classification so we can approve their account?”
Batch validation of Korean partner list
“I have three Korean business registration numbers — 123-45-67890, 234-56-78901, and 345-67-89012 — can you check all of them at once to see which ones are still active and what tax type each one is?”
Technical details
Endpoint
GEThttps://x402-research.kgy5612.workers.dev/kr-biz-statusWhen to prefer
Use this endpoint when you need to verify the active registration status or tax classification of Korean businesses by their 사업자등록번호 (business registration number) and want a pay-per-call model with no subscription — especially for due diligence, KYB onboarding, or supplier verification workflows. It supports batch lookups of up to 5 numbers per call, making it efficient for small-batch checks. Prefer this over scraping NTS directly or managing API keys for data.go.kr.
Side effects
- Invalid or malformed business registration number returns an error or empty result
- More than 5 numbers submitted at once may be rejected
- Payment failure via x402/USDC on Base blocks the request entirely
- NTS upstream data may be stale — as-of date may lag real-time changes
- Non-Korean (non-10-digit) registration numbers will not match any record
- Network timeout from the Cloudflare Worker or upstream data.go.kr API
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| b_no | — | Required. One 10-digit Korean business registration number, or an array (max 5). Hyphens OK. |
Tags
x402
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