asciified is a small webapp that gives you the ability to create figlets using the figlet package. You can either use this webapp and copy the figlet you like or you can also use the API I exposed for you. Make HTTP GET requests to /api/v2 and set the text parameter.
Example:

/api/v2/ascii?text=ASCII+art

Optionally you can set the font parameter to specify the output font (the available fonts are the ones you see in this page).
Example:

/api/v2/ascii?text=ASCII+art&font=Trek