Api calls

Hi!

Thanks for the plugin, I really needed an inline currency converter.

But it seems that everytime an user open a post with this shortcode, the api gets called.

I’ve made 35 calls to the api so far and I’m only testing the shortcodes in one post (showing on https://openexchangerates.org/account/usage). So when open to the public I’ll get the 1000 limit pretty soon.

I suppose this is not normal. Am I doing something wrong? I haven’t changed much the default settings. The currency code cache is set in the default 24 hours.

Thank you for your help