Usage & License
What can I use the J-Quants API for?
J-Quants API is a service limited to private use by individuals. Use by corporations, distribution of data to third parties or provision of applications using the data by individuals is prohibited, regardless of whether it is for commercial/profit or non-profit. For corporate use or external distribution, please use J-Quants Pro.
What do you mean by private use?
Private use refers to utilizing this data for one's own investment analysis, portfolio management, etc. Providing or distributing the results of investment analysis conducted using this data to third parties on a recurring basis does not qualify as private use.
While it is permissible to utilize this data for portfolio management services provided by third parties, please note that when the data is accessible to others, it does not fall under private use.
Can I use J-Quants API data for blogs or SNS articles, etc.?
You are welcome to disclose the results of your analysis or your analytical methods.
However, please note that it is prohibited to distribute or share the data itself obtained by J-Quants API in a form that can be viewed. Also, providing or distributing the results of investment analysis conducted using this data to third parties on a recurring basis does not qualify as private use.
Can I publish or distribute an app that integrates J-Quants API to other users?
The following cases do not qualify as private use and are therefore prohibited:
- Providing functionality to share or publish J-Quants data or analysis results among users.
- Configurations where J-Quants-derived data is stored or relayed on the app operator's server.
The following design is acceptable under the terms of use:
- Each user of the app individually subscribes to J-Quants API and obtains data using their own API key.
- The obtained data and analysis results are not disclosed to anyone other than that individual user.
Can I use J-Quants API data to write my graduation thesis?
Students may use the library for academic purposes only to write their graduation theses. However, use by classes or groups of students in classes or seminars, use by faculty members for the purpose of teaching classes or providing guidance, and use by researchers for the purpose of writing papers or presenting papers at academic conferences are prohibited. Please use J-Quants Pro if you plan to use it for these purposes.
Can I use the data after I cancel or cancel my subscription?
J-Quants API is a data usage service, not a data sales service, so please delete the data you have acquired up to that point after cancelling your subscription.
In the event of cancellation or withdrawal of subscription, the data acquired up to that point will be handled in accordance with the Terms of Use. Any use of this data for purposes other than personal use after subscription cancellation or withdrawal is prohibited.
After changing plans, is it possible to use the data from the previous plan?
J-Quants API is a data usage service, not a data sales service, so after changing plans, you will not be able to use the data you have previously acquired with a higher plan. Please delete the data acquired under the higher plan.
Can I publish analysis results (charts, etc.) on websites or SNS?
Distributing or sharing raw data directly is prohibited, but sharing analysis results (charts, graphs, reports, etc.) is permitted. However, continuously and repeatedly publishing analysis results is not considered personal use (e.g., repeatedly streaming analysis on YouTube is not considered personal use).
Can I publish analysis results in YouTube videos? Does ad revenue make it commercial use?
Publishing your own analysis results and methods is acceptable. However, avoid displaying raw data in a form viewable by viewers. Continuously distributing analysis results to third parties is not personal use. Ad revenue alone does not immediately constitute 'commercial use,' but the above conditions must be met.