---
title: "Provenance-labelled alphabet names of a Japanese corporation"
method: GET
path: "/v1/alphabet-names"
tags: ["Names & Resolution"]
---

# Provenance-labelled alphabet names of a Japanese corporation

`GET /v1/alphabet-names`

## Request

- Base URL: `https://jp-verify.obolpay.xyz`
- URL: `https://jp-verify.obolpay.xyz/v1/alphabet-names`
- Auth: one of:
  - none
  - API key in header `X-API-Key`

Provenance-labelled alphabet names of a Japanese corporation (official-en /
official-reading / generated) from the houjin-bangou mirror, plus folded
matching_variants for screening ingestion. Corporations only (APPI: the register
carries no individual proprietors; all fields are public corporate data).

## Query parameters

- `corporate_number` string: a 13-digit 法人番号 (Corporate Number, check-digit validated)
- `t_number` string: alternative input: T + 13-digit 法人番号 (the corporation's qualified-invoice number format); resolves to the same corporation

## Headers

- `X-API-Key` string

## Response `200`

Successful Response

- unknown

## Other responses

- `400`: Malformed input — refused before metering; nothing was charged.
- `401`: Unknown, inactive, or expired API key.
- `422`: Validation Error
- `429`: Quota exceeded for the caller's tier.
- `503`: The register, or an optional feature, is unavailable or not configured on this deployment. A register 503 (since 1.4.1) also carries the mirror's `data_as_of` with the source fields — `source_latest_diff_date` (the newest 差分 the NTA 公表サイト listed when the sync last read it), `source_checked_at`, `source_gap_business_days` and `freshness.rule` (`stale` here) — so a caller can tell a mirror that is behind its source (`data_date` older than `source_latest_diff_date`) from a source that has not published (equal, but `source_checked_at` older than `freshness.source_check_max_hours`); `data_as_of` is null when the mirror is absent. Nothing was charged.

---

[API](https://skmtc.dev/obolpay/apis/jp-verify.md) · [All operations](https://skmtc.dev/obolpay/apis/jp-verify/llms.txt) · [OpenAPI document](https://skmtc.dev/obolpay/apis/jp-verify/revisions/bf8851690df0?raw)