API

JSON endpoints. Every response except the payment challenge includes the disclaimer.

Free

• GET /v1/events/latest returns announcements from the last 7 days, newest first. limit defaults to 20, maximum 50.
• GET /v1/exchanges returns the tracked exchanges and their sources.

Paid

GET /v1/events returns the full history, newest first, without the Japanese title. Filters: exchange, type, symbol, since, until, first_in_japan, limit (1 to 500, default 100) and cursor.

Each call costs 0.02 USDC on Base, or 3 JPYC on Polygon plus the OpenPay fee of 1 JPYC (4 JPYC in total). Payment uses x402 through OpenPay. A call without payment returns 402 with both options. A bad query returns 400 before any payment.