Free from aistudio.google.com/apikey. This key gets embedded in your website's own source code so the widget can call it directly — anyone could technically view and copy it. That's a low-risk trade for a free-tier key (nothing to bill), which is why Gemini is the recommended choice here.
The bot only answers using what you put here — it's told to say "I'm not sure, please contact us" for anything else, to avoid making things up.
Protects your embedded API key from runaway cost/quota use — once a visitor hits this in one browser, the widget tells them to contact you directly instead of calling the AI again until the next day.
Paste the downloaded snippet right before </body> on any page of your website. It calls the AI provider directly from each visitor's browser using the key above — there's no server, nothing to host, and nothing of yours goes through MigaBuilder.