Startup Idea: Startup Idea for a Multichannel Online Selling Platform

Startup idea to develop a software that simplifies online selling on different platforms like Craigslist, eBay, Offerup, and Letgo. Key features would include automatic relistings, price drops, sales tracking, crossposting, and a report of amount currently listed.

I sell on craigslist. I would pay for a software program that would allow me to manage my listings more effectively. Automatic re-listings and price drops would be extremely helpful. So would a running tally of amount currently listed, as well as a way to keep track of monthly sales. I would also love the ability to crosspost to offerup, letgo, ebay, etc. Automatic relistings alone would save me more than an hour a day.