hello, i can confirm that the service is up and running and all invoices are paid and will be paid. We have a fulfilment rate of 100% (including your 310 euros, you should have received a receipt by email, pls check your spam filter). Since for privacy reasons we run our own mail servers and dont use google mails can get lost easily / blocked.
In case you dont receive a reply within 24 hours, just go to the chat on the website, there should be somebody replying at nearly all times.
-Exchange rate is always based on Kraken
-The service takes over exchange rate risk
-The purpose of the service is to make sure that the bill gets paid and that the invoice payers are trusted
I want to emphasize that it is a DECENTRALIZED system where users pay bills for other users and this means that payments are NOT instant. They will take a few days (Sepa takes 2 days, not counting weekends etc). However, the services makes sure that the invoice gets paid in time.