Node.js as necessary requirement

Please, I would like to ask, whether Node.js is really necessary requirement for using your api, as this is listed. I'm using codeignator php framework and would like to use simple api calls with curl. Are there some special dependencies that require node.js? Or is it just preferable framework and your api is also usable in python, php etc.? I have no issue with npm, but node.js as only solution seems to me a bit limiting. Thank you.