The International Organization of Securities Commissions (IOSCO) is a global body that brings together securities regulators from around the world. It sets standards for securities markets and works to promote their efficiency, transparency, and stability. The IOSCO has issued a set of principles that provide guidance to securities regulators on the regulation and supervision of market intermediaries, including forex brokers.

1. Authorization and Registration: Forex brokers should be authorized and registered with the relevant regulatory authorities in the jurisdictions where they operate. They should also comply with the regulations and requirements of those authorities.
2. Segregation of Client Assets: Forex brokers should maintain separate accounts for their own funds and client funds. Client funds should be held in trust accounts that are separate from the broker's own accounts.
3. Disclosure: Forex brokers should provide their clients with clear and accurate information about the risks and costs associated with forex trading. They should also disclose any conflicts of interest that may arise from their business activities.
4. Suitability: Forex brokers should ensure that the products and services they offer are suitable for their clients. They should also have policies and procedures in place to assess the suitability of their clients for forex trading.
5. Fair Treatment of Clients: Forex brokers should treat their clients fairly and not engage in any unfair or deceptive practices. They should also have policies and procedures in place to handle client complaints and disputes.
6. Risk Management: Forex brokers should have robust risk management systems in place to manage the risks associated with forex trading. This includes monitoring market volatility and liquidity, setting appropriate leverage limits, and having adequate capital reserves.
7. Compliance: Forex brokers should comply with all relevant laws, regulations, and standards, and should have internal controls and procedures in place to ensure compliance.