as a condition to using services you are required to open an account with 500px and select a password and username and to provide registration information. the registration information you provide must be accurate complete and current at all times.
you do not have to provide your legal name except for paid accounts for billing purposes and you can use the service with a pseudonym.
The service allows you to use pseudonyms
Pseudonyms allowed
{'500px.me', '500px.net', '500px.org', '500px.com'}
You do not have to provide your legal name (except for paid accounts for billing purposes) and you can use the service with a pseudonym.