RCSB PDB
3D structures of proteins and nucleic acids

Decodes base64 encoding and parses it to return a solution to the calculation in JSON.
Remote Calc API is a free Science & Math API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
A simple web service to implement a calculator built using Python/Django. The service offers an endpoint that reads a string input and parses it. it decodes the base64 encoding and interprets it by...
Details from github.com.

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3D structures of proteins and nucleic acids
The Remote Calc API is provided by elizabethadegbaju (github.com). A simple web service to implement a calculator built using Python/Django. The service offers an endpoint that reads a string input and parses it. it decodes the base64 encoding and interprets it by...
Yes. The Remote Calc API is listed in the Science & Math 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 Remote Calc API requires no authentication, so you can start making requests without signing up.
Yes. The Remote Calc API supports CORS, so front-end JavaScript can call it directly.
Yes. The Remote Calc API is served over HTTPS, so it's safe to use in production.