It may have been Chatex if you subscribed to a service that offered access to multiple AI model families in one place. Chatex is an independent AI aggregator and is not affiliated with or endorsed by OpenAI, Anthropic, Google, or the providers behind those model families.
Check for the bank statement descriptor WWW.CHATEX.AI and search your inbox for the subject Your Pro plan is ready. Those are the fastest ways to confirm whether the charge belongs to Chatex.
If you still are not sure, use the support page and choose Billing / charge. The flow will ask for the same identifiers our team uses to confirm whether it was a Chatex purchase.