This offer is no longer active as Eurobet has shut down all US accounts:

Dear Affiliates/Partners,

Please be advised that in the light of recent actions by US regulators, Eurobet has regretfully taken the decision to cease taking any business through its websites from U.S. residents with immediate effect. U.S. residents will no longer be able to transact with our websites and all accounts held by U.S. residents have now been closed.
We would therefore ask you to stop advertising our brand name with immediate effect if your website is addressed to a US audience.

Please see below the contents of an email which has been sent to all of Eurobet's US customers:
<<Please be advised that in the light of recent actions by US regulators, Eurobet has regretfully taken the decision to cease taking any business through its websites from U.S. residents with immediate effect. U.S. residents will no longer be able to transact with our websites and all accounts held by U.S. residents have now been closed.
We are contacting you because we believe that, based on the personal details you have provided us, you are a US resident and therefore affected by this decision.
Where we already have your payment details we will refund any outstanding balance using that method within 7 days from today. If we do not have the necessary details please contact us on +44 1483 773 224or via email at uscustomerservice@eurobet.com to confirm how you wish any existing balances on your account should be repaid including the appropriate financial details. We commit to processing such refund with 7 days of receiving your payment instructions.
On behalf of the entire Eurobet team we apologise for the inconvenience caused and thank you for your previous
custom.>>
We would like to thank you for all your continued support and assistance and we apologise for any incovenience this might cause.

If you need further clarification do not hesitate to contact us.