Have we measured or found evidence of a detectable origin point of the big bang?
There is no single origin point.

Before the big bang, the entire universe was contained in an extremely dense singularity - there was no "space" for the universe to expand into, the very fabric of spacetime was contained entirely in the singularity. There is no single "origin point" in the universe where the big bang took place where we'd see the entire universe receding from us. Rather, from any point in the universe we can see everything else receding. The big bang happened everywhere, since the whole universe, including space itself, came from that singularity.