The ENUBET Collaboration is developing a technology to reduce by one order of magnitude the uncertainty on fluxes in conventional neutrino beam. The ENUBET beamline exploits the large angle production of positrons from $K^+ \rightarrow e^+ \pi^0 \nu_e$ in the decay tunnel to monitor the associated production of $\nu_e$. This method provides the $\nu_e$ rate at source at the 1% level. In this talk, we will summarize the results during the first year of the project and plans up to completion (2021).