Error calling Market Stack API from GPT

Hello, I am trying to build a custom GPT, with an action. I am calling “market stack” API. I have a basic subscription, and have tested the calls using curl and they work fine and register in my market stack dashboard. I know the basic subscription doesn’t allow real time calls, but it’s fine for historic data.

I wrote the schema, and tested the end points and they worked fine. I searched for historic prices in the preview window and it asked to start the action, it ran and gave the information back and summarised it, so far so good. After I updated it, it won’t work, it keeps saying it can’t find the api key.

It’s driving me mad, can anybody look at my schema and help please or advise what might be wrong?

Thanks!