While order placement won’t be in scope, we have worked on a platform that calculates live gsec yields basis best bid and ask prices to make gsec buy/sell decisions.
Would be great to hear what else can be added on this page to make it more useful!
(Tip: Test during market hours for live prices).
And with some basic understanding of yield curves, the tool also helps you understand that the gsec mentioned below was actually not underpriced, given the maturity.