promote google maps api without showing my key

i have a google maps api key. full packet (javascript api - geocoding - streetview another etc..)

Google creates an image on the map (it becomes img src), but my request is not to show the api key when assigning this link, the image page to my potential customer.

Example link below (YOUR_API_KEY part) if you enter the api key, the image will appear, but it is meaningless to throw it like this, if I put the api key, it can also use it..

Click to show image

What is your suggestion?