Daichodo

Terms of Service

These terms govern use of Daichodo (the "Service").

The Japanese version is the operative text. This translation is provided for convenience; where the two differ, the Japanese governs.

Notice of amendment (posted 20 September 2026)

We are adding "Showing the data to third parties" to clause 4. It requires the National Tax Agency attribution to accompany data from the Service where you display it to third parties. Internal checking and reconciliation carries no new obligation.

Effective 21 October 2026. Clause 12 requires at least 30 days' notice of the content and the effective date, and this is that notice. If you do not accept the amendment you may cancel before it takes effect.

1. Scope

These terms apply to all use of the Service.

The Service is offered to businesses. By registering, you represent and warrant that you are entering into this agreement as a business or for business purposes. We may refuse or terminate registration that is inconsistent with this representation.

2. Registration

An account is created by applying through the Service and being accepted.

3. API keys

You are responsible for keeping your API keys secure. A key is displayed once at creation; we store only a hash and cannot reproduce it.

Use of your key by a third party is treated as use by you. If you suspect a key has been exposed, revoke it immediately from the dashboard.

4. Data source and accuracy

The data provided is derived from the National Tax Agency's published qualified-invoice-issuer and corporate-number datasets.

Daichodo is not provided by, affiliated with, or endorsed by the National Tax Agency.

We make reasonable efforts regarding accuracy, completeness and timeliness, but do not warrant them. Where the published source is wrong, our data carries the same error.

Tax determinations are yours to make. Our responses are not tax advice.

Showing the data to third parties (effective 21 October 2026)

Both National Tax Agency sites are published under 公共データ利用規約 (v1.0), which permits redistribution but does not permit unattributed redistribution.

If you show data obtained from the Service to third parties — in your product, on a screen, in a document or in a report — you must display the attribution below near that data:

出典：国税庁適格請求書発行事業者公表サイト（国税庁）（https://www.invoice-kohyo.nta.go.jp/）を加工して作成
出典：国税庁法人番号公表サイト（国税庁）（https://www.houjin-bangou.nta.go.jp/）を加工して作成

Show whichever corresponds to the data you are actually displaying. The strings are Japanese in an English product too: the licence condition is on the credit, not on the reader. You must also not present processed data as though the National Tax Agency produced it.

Internal checking and reconciliation carries no such obligation. It arises when you display.

This is a condition of using the Service and also our own obligation to the publisher: if your product drops the attribution, that is our breach as well as yours.

5. Prohibited conduct

You may not:

6. Suspension and termination

If you breach clause 5 (Prohibited conduct), or if the representation you make under clause 1 that you are a business turns out not to hold, we may suspend your use of the Service or terminate your registration without prior notice.

Fees already paid are not refunded in that case, unless our action was without reasonable grounds.

7. Changes and suspension

We may change or suspend the Service without prior notice, including for maintenance, force majeure, or changes to the upstream published data.

8. Fees and payment

Fees and payment methods are as set out on the pricing page. Payment is processed by Stripe; we do not store card details.

9. Cancellation

You may cancel at any time from the dashboard. Cancellation takes effect at the end of the current billing period and fees are not refunded pro rata.

10. Limitation of liability

This clause limits our liability in part. It does not exclude it entirely.

We are liable for damage caused to you by our breach of contract or by tort. Except where we have acted with intent or gross negligence, that liability is capped at the fees you paid us in the month in which the damage arose.

The cap does not apply to damage caused by our intent or gross negligence.

Whether we are at fault, and the extent of any damage, are determined by law and by a court. They are not determined unilaterally by us.

Disputes between you and a third party arising from your use of the Service are resolved at your own cost and responsibility.

11. Ownership

The Service and all intellectual property in it belong to us or to the respective rights holders. Nothing in these terms transfers those rights.

We claim no rights in the National Tax Agency's published data itself. The attribution we display is an obligation under the 公共データ利用規約, not a claim of ownership.

12. Amendment

These terms are standard terms of contract (定型約款) under the Civil Code. We may amend them without your individual consent only where:

  1. the amendment is in the general interest of users, or
  2. the amendment does not conflict with the purpose of this agreement and is reasonable in light of the need for it, the appropriateness of the amended content, the fact that this clause provides for amendment, and other circumstances.

Where we amend under the above, we will give notice of the amended content and its effective date at least 30 days before that date, by posting on the Service or by email to your registered address.

If you do not accept an amendment, you may cancel before it takes effect.

13. Severability

If any provision of these terms, or part of one, is held invalid or unenforceable, the remainder of that provision and all other provisions continue in force.

14. Governing law and jurisdiction

Japanese law governs. The court having jurisdiction over the Service's place of business has exclusive jurisdiction over any dispute.

Last updated: 20 September 2026 (amendment notice posted)
Clauses currently in force were last amended: 15 August 2026
Next amendment takes effect: 21 October 2026