GMS, which was acquired by Bragg Gaming in 2017, has been granted a vendor license by the New Jersey Division of Gaming Enforcement, allowing it to direct users from its site to New Jersey sportsbooks.
The approval signals further expansion in the US for Bragg Gaming following entry in 2019, which saw the group sign a deal with New York-based Seneca Gaming, in partnership with Kambi.
That helped Bragg record a 30% year-on-year increase in revenue for Q3 2019.
GMS Managing Director Rick Waterlow said: "We are thrilled to receive this vendor license and to partner with New Jersey-licensed operators.
"Our parent company Bragg Gaming Group holds a wealth of data on acquiring gaming customers, which can be fed into the GMS website in the US."
It was a strong 2019 for sports betting in New Jersey, with sports wagering gross revenue increasing 55% to $32.9m year-on-year for the month of November, when the latest figures were published. Full-year figures are expected to be released soon.