FYI : i found that the google repo is more easy to integrate :
https://developers.google.com/webfonts/docs/developer_api
thank you for your answers anyway

it is an iPad app, so the user can not simply go to the website and download the font.
I was looking to integrate the search engine of dafont and show the result within my app.
This is usually done via API, where the website can be requested via predefined query and put its answer into xml file.

You are right that the fonts must be declared into the app, but they are not obligatory embedded.
I can imagine a process where the user has to download the fonts at runtime, and after licences fee for exemple.

My question was more about API, as I haven't seen automatical integration of dafont.
I think I can also ask webmaster at dafont.com

edit : in fact, I don't even need to declare all the fonts in the app, as I can add them at runtime with :
https://github.com/zynga/FontLabel

even if I don't include the fonts by default but help my users to discover them ?

not quite that :
> An editor for iPad, can you be a little bit more specific ?
it is a nice text editor to create nice illustrations, like infographics.
The user can put text, image and shapes and display them to look nice.

> let me synthesize this. You want to make people pay for fonts they can download legally for free here, am I right ?
it is not the paying system that is important but the ability to request and download those fonts automagically.
As it is a commercial product, I want to respect the licence from the original author and give them the fee they are entitled to, like with the "Donate to author" button

Erwann

Hello,

I came here looking for API to integrate into a ios application.
I have developped an editor for iPad and I would like to extand the provided font of the device.

Is it something you have plan to do ?
It would be great if my users could search for some specific fonts on dafont, and pay to download the fonts they like.

Cheers,
Erwann