税金どこいった？ (Zeikin Dokoitta) is a private civic-tech site built on the public data of Japan's Administrative Project Review (Cabinet Secretariat "Visualization site"). You can search FY2021-2026 data by project, payee and corporate number, compare requested and decided budgets, and see totals by ministry. Amounts, payees and sources are free to view without registration. It also has free calculators (furusato nozei, income wall, year-end adjustment) and a public MCP endpoint for tools such as Claude or Cursor. CSV export is a paid plan. The site is mainly Japanese; an English version exists at /en.
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