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You are taking a risk of only being paid 1/3rd of your market rate for the next 6 months.

After that, you may be without a job. This is your downside, and it's what you should plan for.

In a best case situation, after 6 months you will start gradually earning back the money you missed out on, + a raise.

This means the only upside for you is the raise you _may_ get after 6 months. You should decide for yourself if you're comfortable with the amount of risk you will be taking for this upside.

As an extra caveat: it seems to me like it would be very easy for the founders to claim "there is no capital". Especially considering you are in a foreign country and are likely to not have any insight into the company's financials, it will be extremely hard and costly for you to prove otherwise if things go sour.