If you wish to file a complaint in relation to a crypto asset service provider (CASP), we advise you primarily to contact the complaints department of the CASP in question.
If your complaint is not resolved through that channel, and if your complaint relates to a Belgian CASP under the supervision of the FSMA, you can contact the FSMA. Complaints have an important signalling function for the FSMA as a supervisory authority. The FSMA will assess your complaint and, where necessary, take action. Please note that the FSMA cannot intervene in a dispute between you and your CASP, nor can it, in principle, give you any information covered by professional secrecy.
If your complaint concerns a CASP authorized by an authority of another Member State of the European Union, you should contact the competent authority in that Member State. The list of competent authorities in the other Member States is available on the website of the European Securities and Markets Authority (ESMA). The FSMA is not competent to handle complaints of this nature.