Integrate GPTs into a wordpress website (accessible to non GPT Plus Chat subscribers)

I've created several custom GPTs and would like to integrate them into a Wordpress site. I want these GPTs to be accessible to everyone, even to people who don't have a Chat GPT Plus account. Perhaps this is possible via APIs?

We're not talking about integrating ChatGPT here, but rather well-defined GPTs that I've created and trained.

I own the website and a ChatGPT account with secret key creation.