Is there a way to benchmark additional allowances and benefits within the start-up community? Things like shift allowance, night shift allowance, on-call allowance, etc. What fundamentals do the use for ops and non-ops role?

you can purchase from Mercer and Aon

I am looking for some free resources.

you have to find the companies in your region, or competitors and do research by contacting or networking or reading the JD, websites