EtherFi CEO replied: - It’s likely an issue with the upstream card issuer, they are already in contact. - They promise to compensate for any fraudulent charges (standard dispute process, the money is actually just advanced by them and will eventually be charged back). Personal suggestion: If you have alternatives, use another card for now. If not, lower the limit to an acceptable loss (the default limit of $50k is a bit high). This is a common supply chain attack, traditional banks experience this too. My friend once encountered this with a Capital One virtual card they had never used before.