Basic Calculator

Hi All,

Happy 2017, I hope everyone is having a good time.
I am a software developer and I like giving back to the community. I started investing recently and I developed a simple calculator API that might be able to help out some beginners to calculate the break even share price using Degiro.

This might be a useless tool for some but potentially a useful tool for others.
MOD: Feel free to delete if this is not allowed or move if I am posting in the wrong section.

This API currently only works for US shares.
It requires 3 input from the end-user: Share Price, Share Count and Type
It will return the break even values to the end users.

Full API link example:
https://investment-calculator-api.appspot.com/_ah/api/calculator/v1/degiro?share_price=107.750&share_count=10&type=US

Replace:
investment-calculator-api.appspot.com/_ah/api/calculator/v1/degiro?share_price={price}&share_count={count}&type=US

Expected Results:
{
"break_even_share_price_change": 0.108,
"break_even_share_price_percentage_change": 0.1,
"total_fees": 1.08,
"portfolio_value": 1077.5,
"type": "US",
"share_price": 107.75,
"portfolio_value_after_fees": 1076.42,
"share_count": "10",
"break_even_share_price": 107.858,
"kind": "calculator#calculatorItem",
"etag": "\"K2NXo111zMaHxkNJ8ETkW3bYbPc/poGMX2hpguWLiu8hwsUwOSe1G2o\""
}

I am also able to provide the source code.

Regards
RS