Quick take. Segpay is a U.S.-domiciled (Florida) adult payment processor with mid-2000s tenure and a reputation for responsive account-manager support relative to the larger CCBill / Epoch options. Typical fee range 10–13%, rolling reserve 10–15%, supports the major adult CMS billing integrations out of the box.
Who it fits. Mid-tier subscription paysite operators ($5K–$500K monthly volume) who value an actual account manager you can email and get a same-day response from. Operators wanting a third processor in the rotation alongside CCBill and Epoch for redundancy.
Deep dive: our full Segpay review covers fee structure, integration options, alternatives, and the situations where Segpay either is or is not the right choice. Read that before applying.
Related: full adult payment processors comparison, Mastercard SMR program (required registration for adult merchants regardless of which processor you pick).