Use StellarID.io to power federated Stellar addresses for your domain without having to set up a federation server or database.
Add a domain by clicking the green "Add a new domain" button. Input a domain you own in the text box that appears and submit.
Add a stellar.toml file to your site at https://yourdomain.com/.well-known/stellar.toml that points to "https://stellarid.io/federation/".
It's important that you use your naked domain for the toml file URL - Stellar clients will not look for it under your www subdomain.
Modify your stellar.toml file/page to enable CORS - cross-origin resource sharing.
You can do this by adding "Access-Control-Allow-Origin: *" to the HTTP header.