Privacy Policy
jp-corporate-number · Operator: MK Career Planning · Last updated: 2026-11-01
1. What we handle
- Payer wallet address and transaction hash of each paid call (x402, USDC), with the tool name, price, network and time.
- Results of paid calls (the response body), so that you can fetch them again with
get_receipt if the response was lost after payment. The stored result includes the inputs you sent (for example the dates and places of an itinerary).
- Retry check value: while a paid result is kept, we also keep a keyed one-way value of the tool name and the arguments (HMAC-SHA256 with a secret key), used only to recognise a retry with the same payment. It cannot be turned back into the inputs without the key, and it is deleted together with the result. Calls that are not settled (paused, refused or failed) keep no such value. Records made before 2026-11-01 may hold an unkeyed SHA-256 hash of the arguments instead, which is deleted on the same schedule.
- Free tool usage: daily counts per tool and channel, and a daily estimate of distinct callers computed from a one-way hash of the first three parts of the IP address with a key that changes every day. We do not store free tool inputs in our database.
- Request logs: request logging (Cloudflare Workers Logs) is turned off for this service, so the names, places or other inputs you send are not kept in a request log.
- MCP responses: this service does not write MCP responses to storage; each response is sent directly over the connection.
- IP addresses: we do not store IP addresses in our own database. Cloudflare, which hosts this service, processes IP addresses and request metadata to deliver the service and may keep them in its logs, under Cloudflare's own policy. To enforce per-client rate limits on free calls, we pass a one-way hash of your IP address and the first 64 characters of your User-Agent to Cloudflare's rate-limiting counters, which only count requests over about a minute; we do not store either.
- Record of our calls to the National Tax Agency: when an answer needs data we have not cached, we call the Corporate Number System Web-API of the National Tax Agency of Japan (NTA) with this service's own application ID. We record the time, the kind of call, the API path, the parameters we sent (never the application ID) and the HTTP status and number of rows returned, for 366 days, to check that we do not make bursts of access. A name you search for is recorded as an unkeyed SHA-256 hash, not as text; short or easily guessed names can be recovered from such a hash, so treat it as the name itself. A corporate number is recorded as sent. The record holds no IP address, wallet address or other information about who asked. Our request logs (Cloudflare Workers Logs) are turned off for this service because inputs may contain names. The NTA's answers (published information about corporations and other organizations) are cached for up to 1 day, keyed by corporate number or by a hash of the name.
We do not ask for names, email addresses or accounts to use the API.
2. Why
- To process payments, prevent double charges (idempotency) and let you re-fetch a paid result.
- To keep accounting records and to enforce daily limits.
- To measure aggregate usage. Our own monitoring payments are excluded from customer figures.
3. Third parties
- Cloudflare (hosting, storage, logs).
- Payment facilitator that verifies and settles x402 payments: Coinbase Developer Platform (api.cdp.coinbase.com), or PayAI (facilitator.payai.network) or Dexter (x402.dexter.cash) as a fallback. When a paid HTTP endpoint is settled through Coinbase, Coinbase may list that endpoint (not you) in its public x402 Bazaar catalog. The facilitator receives the signed payment, which includes your wallet address.
- Public blockchain: payments settle on Base. Wallet addresses, amounts and transaction hashes on a public blockchain are public and permanent; neither we nor anyone else can delete them.
We do not sell personal data and do not use it for advertising.
4. Retention
- Results of paid calls and their retry check values: 30 days after settlement, then deleted together (
get_receipt then returns RECEIPT_NOT_FOUND).
- Payment records (wallet address, transaction hash, amount, tool, time): 7 years for accounting, then deleted.
- Free tool daily counts: kept as aggregate statistics.
- Deleted data: after we delete data (at the end of a retention period or on request), it can remain recoverable through our database provider's point-in-time recovery (Cloudflare D1 Time Travel) for up to 30 days, after which it is gone.
- Request logs: turned off for this service. Other Cloudflare logs: according to Cloudflare's retention settings.
5. Requests and contact
To ask about or request deletion of data linked to your wallet address, contact: mk.career.planning@gmail.com
Please send the wallet address and, if possible, the receipt_id or transaction hash. We can delete stored results; payment records required for accounting are kept for the period above, and data on the blockchain cannot be deleted.
6. Disclaimer
This service relays information published through the Corporate Number System Web-API of the National Tax Agency of Japan (NTA), processed by MK Career Planning. Its content is not guaranteed by the NTA, it is not an official service or result of the NTA or the Government of Japan, and it is not a decision on whether to trade with, lend to or contract with any party. See the Terms of Service.
7. Changes
We will update this page and its date when this policy changes. See also Support and the Terms of Service.
日本語の要旨
- 運営者：MK Career Planning
- 扱う情報：有料の呼び出しの支払い元ウォレットアドレス・取引ハッシュ・金額・時刻、有料の結果（receipt で再取得するため。送られた入力を含みます。例：旅程の日付と場所）、有料の結果を残すあいだは、同じ支払いでの再試行を見分けるためだけに、道具の名前と入力から秘密の鍵で作った一方向の値（HMAC-SHA256。鍵がなければ入力に戻せません）も残し、結果と一緒に消します（精算しなかった呼び出しには残しません。2026-11-01より前の記録には鍵なしの SHA-256 が入っていることがあり、同じ期間で消します）、無料ツールは道具・経路ごとの1日の回数と、IP アドレスの上位3つの区切りを日替わりの鍵でハッシュした1日の利用者数の推定（無料ツールの入力は当方のデータベースに保存しません）。このサービスは呼び出しの記録（Cloudflare の Workers Logs）を止めており、送られた名前・場所などの入力は呼び出しの記録に残りません。MCP の応答は保存に書かず、そのまま接続で返します。IP アドレスは当方のデータベースには保存しません（Cloudflare のログの範囲で Cloudflare が扱います）。無料の呼び出しの上限を数えるため、IP アドレスと User-Agent の先頭 64 文字をまとめた一方向のハッシュを Cloudflare の回数の計数（1分程度）に渡しますが、どちらも保存はしません。
- 国税庁への呼び出しの記録：キャッシュに無いデータが必要なときに、当方のアプリケーションIDで国税庁の法人番号システム Web-API を呼び、その時刻・呼び出しの種類・API のパス・送った引数（アプリケーションIDは含めません）・HTTP の状態・返った件数を 366 日保存します（短時間に大量のアクセスをしていないことを確かめるため）。検索した名前は文字ではなく SHA-256 のハッシュだけを、法人番号は送ったとおりに記録します。IP アドレス・ウォレットアドレスなど、誰が問い合わせたかの情報は記録に入れません。入力に名前が含まれうるため、この台の呼び出しの記録（Cloudflare Workers Logs）は止めています。国税庁の応答（法人等の公表情報）は、法人番号または名前のハッシュごとに最長1日キャッシュします。
- 目的：決済・二重課金の防止・結果の再取得・会計記録・1日の上限・利用の集計。
- 第三者：Cloudflare（配信・保存）、集金係（Coinbase Developer Platform、予備に PayAI・Dexter。Coinbase で精算した有料の HTTP の口は、Coinbase の公開の一覧に載ることがあります。載るのは口であって、利用者ではありません）、ブロックチェーン（Base 上の取引は公開され、消せません）。
- 保存期間：有料の結果と再試行の照合用の値は精算から30日で一緒に消し、支払いの記録（アドレス・取引ハッシュ・金額・道具・時刻）は7年。消したデータ（保存期間の終わり・削除の依頼）も、データベースの時点復元（Cloudflare D1 の Time Travel）で最長30日は戻せる状態で残り、その後はなくなります。
- 削除依頼・問い合わせ：mk.career.planning@gmail.com（ウォレットアドレスと receipt_id または取引ハッシュを添えてください）。
- 免責：このサービスは、国税庁法人番号システムWeb-API機能を利用して取得した情報をもとに作成しているが、サービスの内容は国税庁によって保証されたものではない。MK Career Planning が中継・加工したものであり、国税庁・日本国政府の公式のサービス・結果ではなく、取引・融資・契約の可否を判断するものでもありません。利用規約もご覧ください。