Keybase API

// Keybase API

JS:
var username=prompt("Enter the username:");
var keybase="https://keybase.io/_/api/1.0/user/lookup.json?username="+username;
window.open(keybase, "_blank");

Bookmarklet:
javascript:(function()%7Bvar%20username%3Dprompt(%22Enter%20the%20username%3A%22)%3Bvar%20keybase%3D%22https%3A%2F%2Fkeybase.io%2F_%2Fapi%2F1.0%2Fuser%2Flookup.json%3Fusername%3D%22%2Busername%3Bwindow.open(keybase%2C%20%22_blank%22)%7D)()