Boost Mobile does not offer the HTC One as of 2015. The only HTC phones offered through Boost Mobile are the HTC Desire 510 and a certified pre-owned version of the HTC One SV.
The HTC One and the HTC One SV are not the same device. The One SV is a lower-cost device offered on prepaid carriers, while the One is HTC's highest-tier phone. Both phones have LTE and feature Beats Audio, but the One features a larger screen and faster processor than the One SV.
A prepaid version of the HTC One is available from AT&T and T-Mobile.