The safety and security of our customer data are our highest priorities. Our API clients are using HTTPS (TLSv1, TLSv1.1, TLSv1.2) to send your data to our servers and you can choose to use TLS to query our indices as well.
We have performed a professional penetration testing in the past and have bug bounty program on HackerOne that helps us ensure ongoing security.
We're always looking for advice to help improve our documentation! Please let us know what's working (or what's not!) - we're constantly iterating thanks to the feedback we receive.