Regardless of the payment method, it is generally accepted that selling OSRS gold is legal as long as the seller does not violate any terms of service set by Jagex. Some people sell OSRS gold in exchange for real-world currency, while others sell it for in-game items or currency. Additionally, it is essential to note that the legal status of OSRS gold may vary from country to country. In general, however, it is considered legal to sell OSRS gold as long as the seller does not violate any terms of service set by Jagex, the company that owns and operates Old School RuneScape. There is no definitive answer to this question as the legality of selling OSRS gold depends on several factors.