Makeup
Makeup Information

Genetic conditions, genes, chromosomes and mtDNA data.
MedlinePlus Genetics API is a free Health API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Find information about programmatic retrieval of selected data from MedlinePlus Genetics via API. Learn about available data files and how to use these services.
Details from medlineplus.gov.

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The MedlinePlus Genetics API is provided by MedlinePlus: MedlinePlus Genetics Data Files & API (medlineplus.gov). Find information about programmatic retrieval of selected data from MedlinePlus Genetics via API. Learn about available data files and how to use these services.
Yes. The MedlinePlus Genetics API is listed in the Health 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 MedlinePlus Genetics API requires no authentication, so you can start making requests without signing up.
CORS support for the MedlinePlus Genetics API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The MedlinePlus Genetics API is served over HTTPS, so it's safe to use in production.