@genmon you could prototype quickly and explore with Google AppSheet. One Google Sheet with 3 worksheets. Put data in sheet 1 and 2 and make a separate AppSheet for both. In sheet 3 make a third dataset populated from the first 2 and then make a separate AppSheet for that. You could even populate back to sheet 1 and 2 from sheet 3. You could build a simple 2 sided market with a market maker dashboard… now imagine sheets 1 and 2 were populated by 3rd party apps and you can still be a market maker with sheet 3.