Went live with my first shot at a new market tool, hope this will help all new/experienced players. You can read more on the website but the TLDR is a site that calculates the best items to trade per region every day.
Parse the buy order returns into a humanly logical format, not just the raw return, and for the love of god use digit group separators! 11111111111111111111111111 is a lot harder to read than 11,111,111,111,111,111,111,111,111.
The TypeIDs can be useful for some people. Using a 5-8 digit number vs what could be a 40-50 character long name is easier for a few things. Additionally, sales taxes and broker fees are highly variable character to character. Having a margin value instead would be able to show people whether it falls below their minimum spread levels. For example, I dont bother with anything less than 7%, or I stall out my price changes on things I have listed, and wait for the market to bounce back in my favor. Mind, that 7% does also cover both sides of the transaction.