  We present a map between the tree-level Standard Model Effective Theory
(SMEFT) in the Warsaw basis and massive on-shell amplitudes. As a first step,
we focus on the electroweak sector without fermions. We describe the Feynman
rules for a particular choice of input scheme and compare them with the 3-point
massive amplitudes in the broken phase. Thereby we fix an on-shell basis which
allows us to study scattering amplitudes with recursion relations. We hope to
open up new avenues of exploration to a complete formulation of massive EFTs in
the on-shell language.
