If there was an agreement between you and the recruiter that he/she would pay you some sum of money for taking the job, that agreement should be enforceable. (It might violate the recruiter's agreement with the hiring company, so the hirer might have a cause of action against the recruiter, but that does not affect you directly.)However, issues to bear in mind:1) If the agreement was oral, it can be very difficult to prove what the agreement was for.2) If it comes out (e.g. during litigation) that you had this agreement with the recruiter, since it almost certainly is against the policy of the company which hired you, you may well be terminated from your job.