Yes you can pay someone with a starter check.
The starter check is a real check and works just like a regular check and the starter check has your account number and routing number on it.
So when you write the starter check the person can take it to their bank and cash it or deposit it like a normal check.
The only difference between a starter check and a regular check is that usually the starter check does not have your name or address on the check.
That means that some places may not want to accept the starter check such as Walmart.
But most people will take a starter check for payment.