Suzume Code
01 · Japan Government Data API

Japanese government data,
ready for your application.

Corporate registry, land data, legal texts, statistical tables, procurement notices — normalised, translated into English, and served through a single REST API. Built for AI agents and developer pipelines.

Request accessSee datasets
6
Data domains
47
Prefectures
Daily
Update cadence
REST
API standard

02 · The problem

Japan’s public data is rich.
Getting to it is not.

If your AI agent or data pipeline needs grounded facts about Japanese companies, real estate, demographics, or procurement, you already know the problem. The raw sources exist. Using them productively does not — unless you have a team fluent in Japanese bureaucratic systems and willing to maintain scrapers indefinitely.

01

Language barrier

Government portals are in Japanese. Field names, data formats, and error messages are not designed for programmatic consumption.

02

Format fragmentation

Dozens of incompatible formats — HTML tables, Excel files, CSV, PDF — spread across hundreds of sub-domains with no unified schema.

03

Reliability problems

Sources change structure without notice. Update schedules are unpredictable. No SLAs. Scrapers break silently.

04

Licensing uncertainty

Not all public data is freely reusable. Each source has its own terms, and they are written in legalese Japanese.

03 · Datasets

Six domains.
One API surface.

Each domain covers a set of government sources, scraped continuously, normalised to a common schema, and enriched with English translations. New domains are added as usage signals reveal demand.

Corporate Registry

hojin.houjin-bangou.nta.go.jp

Company name, registration number, address, representative, capital, and legal status for all Japanese entities. Updated daily from the National Tax Agency.

corporate_numbercompany_name_jacompany_name_enaddressstatus

Statistical Data

e-stat.go.jp

Population, economy, labour, agriculture, trade, and social statistics. Thousands of tables from the Statistical Bureau, normalised to a consistent schema.

table_idarea_codetime_periodvalueunit

Real Estate & Land

land.mlit.go.jp

Land price assessments, transaction records, and parcel data from the Ministry of Land, Infrastructure, Transport and Tourism.

parcel_idprefectureassessed_value_jpyarea_sqmland_use

Legal & Regulatory

elaws.e-gov.go.jp

Current legal texts, regulatory notices, and official gazettes. Useful for compliance workflows and regulatory change detection in LLM pipelines.

law_idlaw_numbereffective_dateministryfull_text_url

Procurement Notices

geps.mod.go.jp / choutatsujouhou.go.jp

Government tender notices and contract awards. Machine-readable notices with bidder details, contract value, and outcome.

notice_idauthoritytender_value_jpydeadlineaward_status

Property Transactions

land.mlit.go.jp/webland

Anonymised actual transaction prices for residential, commercial, and agricultural land across all prefectures.

transaction_idprefecturecityprice_jpybuilding_typeyear

04 · How it works

Integrate in minutes.
Trust the data.

01

Connect your application

Generate an API key from your dashboard. Add it as a header to any HTTP client — no SDK required, though client libraries are available for Python and TypeScript.

02

Query the endpoint you need

Each domain exposes a consistent REST interface. Pagination, filtering, and language preferences are standardised across all endpoints. Response format is always clean JSON.

03

Receive normalised, translated data

Every response includes English field names, romanised values where useful, and structured metadata about the source, freshness, and any known data gaps.

Design principles

Accuracy over speed

Data that is wrong is worse than no data. We flag uncertain records, mark stale fields, and document known gaps explicitly.

Developer-first design

The API should be a joy to integrate. Consistent schemas, predictable pagination, clear error messages, and thorough documentation.

Transparency

Every response includes source attribution, last-updated timestamps, and the scrape strategy used. Nothing is a black box.

Japan depth

Genuine fluency and domain expertise. Not surface-level scraping. We understand how Japanese government systems are structured, not just how to parse them.

05 · Developer experience

One request.
Structured data back.

No pre-processing. No translation layer in your codebase. No maintenance burden when a government portal changes structure. Every response is machine-readable, English-annotated, and source-attributed.

REST
REST + JSON
Standard HTTP. Works with any language, any framework.
{}
Consistent schema
Predictable field names across all domains. One integration pattern.
T
Freshness metadata
Every record includes when it was fetched and the source URL.
!
Uncertainty flagged
Ambiguous records are marked. Stale fields say so. No silent errors.
RequestGET /v1/corporate/search
GET https://api.suzumecode.com/v1/corporate/search
Authorization: Bearer sk_live_...
Accept-Language: en

? name=Toyota+Motor
& prefecture=aichi
Response 200 OK
{
  "data": [
    {
      "corporate_number": "4180301012483",
      "company_name": "Toyota Motor Corporation",
      "status": "active",
      "capital_jpy": 397049833000,
      "_meta": {
        "source": "nta.go.jp",
        "fetched_at": "2026-05-07T04:12:33Z",
        "freshness": "live"
      }
    }
  ]
  "pagination": { "total": 1, "page": 1 }
}

06 · Pricing

Pay for what you use.

Usage-based pricing with a generous free tier. No credit card required to start. Enterprise contracts available for high-volume and committed usage.

Explorer
Free
500 calls / month

For individuals evaluating the API or building a prototype.

  • All domains included
  • English-normalised responses
  • Freshness metadata
  • Community support
Start for free
Developer
$49/ month
10,000 calls / month

For teams actively building with Japanese data.

  • Everything in Explorer
  • Higher rate limits
  • Priority data refresh
  • Email support
Get access
Enterprise
Custom
Unlimited

Committed use discounts, dedicated refresh schedules, and SLAs.

  • Everything in Developer
  • Committed-use discounts
  • Custom data refresh SLAs
  • Dedicated support
Contact us

All plans include access to all data domains. Volume pricing available above 100,000 calls/month.