Is there an option, within tabularx, to add a vertical whitespace both above and below the table?

Question

Is there an option within tabularx to add a vertical whitespace both above and below the table?

\documentclass{article}
\usepackage{tabularx}
\usepackage{lipsum}
\begin{document}
\lipsum[1]
\noindent\begin{tabularx}{\textwidth} {XXX}
 \hline
 item 11 & item 12 & item 13 \
 \hline
 item 21  & item 22  & item 23  \
\hline
\end{tabularx}
\lipsum[1]
\end{document}

I tried to add the verbatimbox package which has a service routine \addvbuffer, but it does not work:

\documentclass{article}
\usepackage{tabularx}
\usepackage{lipsum}
\usepackage{verbatimbox}
\begin{document}
\lipsum[1]
\addvbuffer[12pt 8pt]{
\noindent\begin{tabularx}{\textwidth} {XXX}
 \hline
 item 11 & item 12 & item 13 \
 \hline
 item 21  & item 22  & item 23  \
\hline
\end{tabularx}
}
\lipsum[1]
\end{document}

EDITED after the @David Carlisle answer:

@David Carlisle, please see here below the errors I get with that solution (might it be something related to Overleaf, that I am using?)

\documentclass{article}
\usepackage{tabularx}
\usepackage{lipsum}
\usepackage{verbatimbox}
\begin{document}
\lipsum[1]
\begin{center}
\addvbuffer[12pt 8pt]{%%
\noindent\begin{tabularx}{\textwidth} {XXX}
 \hline
 item 11 & item 12 & item 13 \
 \hline
 item 21  & item 22  & item 23  \
\hline
\end{tabularx}%%
}
\end{center}
\lipsum[1]
\end{document}

I get the following errors:

Answer 1

Note you have 7 errors in that file so you shouldn't even look at the layout shown in the pdf which can never be relied on after an error.

tabularx, like tabular does no spacing at all, it is just like a big letter X so remove the \noindent and replace by (say)

\begin{center}
\begin{tabularx}... 
...
\end[center}

The center environment will supply the spacing specified by your documentclass for vertical display constructs.

or in this case place it aroundthe \addvbuffer` (I don't know what that does)

note the missing % added.

\documentclass{article}
\usepackage{tabularx}
\usepackage{lipsum}
\usepackage{verbatimbox}
\begin{document}
\lipsum[1]
\begin{center}
\addvbuffer[12pt 8pt]{%%
\noindent\begin{tabularx}{\textwidth} {XXX}
 \hline
 item 11 & item 12 & item 13 \
 \hline
 item 21  & item 22  & item 23  \
\hline
\end{tabularx}%%
}
\end{center}
\lipsum[1]
\end{document}