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.
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.