Any latex web services with an API?

the Online LaTeX Equation Editor is perfect for this.

EG:

uses the following markup:

![equation using Online Equation Editor]
(https://latex.codecogs.com/gif.latex?x&space;=&space;\frac{4}{5}+\pi\Omega\int_{2\pi}^{\infty}{5\left\(\frac{\tau+3}{2}\right\)d\omega})

note that you will need to escape parentheses with a backslash, eg: \left\( stuff \right\)

If you look through the editor API documentation you might figure out that you can change the format from gif to png by changing the api url endpoint from /gif.latex to /png.latex.

There's also options to set a white background by using \bg_white:

![equation using Online Equation Editor] 
(https://latex.codecogs.com/gif.latex?\bg_white&space;x&space;=&space;\frac{4}{5}+\pi\Omega\int_{2\pi}^{\infty}{5\left\(\frac{\tau+3}{2}\right\)d\omega})

See also this meta.stackexchange answer and this tex.stackexchange answer. I'm sure there are many more answers that point to this tool and implement it in different ways. IE: instead of using the url to generate a gif or png using markdown notation, or you could use html markup and bypass markdown or you could just drag the image over to your post.

I'm looking for the same thing and Latex Online seems to be the closest thing to what we need.

You just need to setup the server by yourself.

EDIT

I've written my own little Sinatra app for this: https://github.com/codegestalt/sinatratex