Contacts
There is one way to reach us — support on the site. The people who answer are the people who build the service.
Support
The chat button is on every page, and there is a support page too. Describe the question in your own words; if it is about an exchange, include its code.
Ticket code
Every ticket has its own code. Keep it: it takes you back to the conversation from another device — no account, no email, no password.
A question about a specific exchange
Quote the exchange code and we will find the operation. Write while the exchange is fresh: a day after it settles the record is stripped and there is nothing left to look into.
Why there is no phone or email
Support on the site asks you for neither a number nor a mailbox — and creates no second place where your data sits. The same principle as everywhere else in the service.