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J-Quants for agents: what it covers, and when you need more

The short answer J-Quants is the official JPX product for Japanese market data, and for most agents it is the right first call. It is operated by the exchange, it is priced for individuals, and since December 2025 it authenticates with a plain API key instead of a token refresh dance, which removes…

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  1. 2026-11-11 00:15 · DEV Community — AI
    J-Quants for agents: what it covers, and when you need more

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