Interface math calculator
How many interfaces does point-to-point actually cost you, against routing through a layer? Run it on your own estate size.
Count everything: ERP, CRM, WMS, billing, the data platform, each partner EDI link, the reporting tool nobody owns.
Fully loaded, including the people who get pulled in when a partner feed breaks on a Sunday.
Point-to-point
66
interfaces to build, test and own
Through a layer
12
and one place to govern them
At 12 systems, point-to-point means 54 more interfaces than routing through a layer.
At a conservative 24 hours of upkeep per interface per year, that is 1,296 hours — about ₹77,76,000 a year, before anyone builds anything new.
The upkeep figure is an assumption, not a measurement — change it in your head if yours is different. The interface counts are not assumptions: n(n−1)/2 against n is arithmetic, and it is why estates that grew one urgent project at a time become impossible to change.
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