Normalized historical records and 25 daily-updated reference series.
49 Gallery Historical Data API is a free Open Data API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
免注册、免费调用、返回 JSON。
Details from api.181649.com.

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Yes. The 49 Gallery Historical Data API is listed in the Open Data category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The 49 Gallery Historical Data API requires no authentication, so you can start making requests without signing up.
Yes. The 49 Gallery Historical Data API supports CORS, so front-end JavaScript can call it directly.
Yes. The 49 Gallery Historical Data API is served over HTTPS, so it's safe to use in production.