What are the best bitcoin exchanges in Brazil?

Can you provide me with a list of the most reputable and reliable Bitcoin exchanges in Brazil? I'm looking for an exchange that offers a secure platform, low transaction fees, and a variety of payment options. I'm also interested in knowing if these exchanges are compliant with local regulations and if they offer customer support in Portuguese. Additionally, I'd like to know if there are any particular features or services that make them stand out from the competition. Thank you in advance for your assistance.