Japanese public data, ready to use in code.

Data APIs and software from Shibuya, Tokyo — built on official public data. Corporate and invoice registries are cross-checked and refreshed daily.

About

Soroban Data Works builds data APIs and software that make Japanese business data easy to use in code. We structure official public data — corporate numbers cross-checked against invoice registrations, and the national holiday calendar — and deliver it through simple APIs. Our Japan Corporate & Invoice Check API and Japan Business Days API are live on RapidAPI, with a delivery-date plugin for WooCommerce currently under review at WordPress.org.

Products

Live on RapidAPI

Japan Corporate & Invoice Check API

Check a Japanese corporate number against the national invoice-registration database in one call: whether a supplier is a qualified invoice issuer, their registered name, and their registration status.

View on RapidAPI →
Live on RapidAPI

Japan Business Days API

Business-day checks and business-day counts for Japan, built on the official holiday calendar — for delivery estimates, deadlines, and scheduling.

View on RapidAPI →
Free beta

EU VAT Number Format & Checksum Checker

A format and checksum pre-check for VAT numbers in 11 EU countries. A pre-check only — it does not verify registration (that is what VIES is for).

View on RapidAPI →
Live — x402

APIs for AI Agents

The same Japanese business data, payable per call by AI agents via the x402 protocol — no account, no API key, no subscription.

API index →
Under review

Soroban Delivery Dates for WooCommerce

A WooCommerce plugin that calculates and shows delivery dates from Japanese business days and holidays.

Data

Everything is built on official public data: corporate numbers and invoice registrations from Japan's National Tax Agency, and the national holiday calendar from the Cabinet Office. The corporate-number and invoice registries are cross-checked against each other and refreshed daily. Holiday data follows the official calendar published by the Cabinet Office.

5,852,862
corporate numbers
5,111,732
invoice registrations
Daily
corporate & invoice registry updates

Company

Name / 名称
Soroban Data Works
Location / 所在地
Shibuya, Tokyo, Japan(東京都渋谷区)
Business / 事業
Data APIs and software / データAPIとソフトウェアの開発・運営
Contact / 連絡先
phoenixrefurbtools@gmail.com