Details - HeadDB

Warning: The UUIDs are not real.

Command

/give @p skull 1 3 {display:{Name:"X",Lore:["Skull from HeadDB.org"]},SkullOwner:{Id:"13c01584-b6e8-3e5e-aff8-404345cf4414",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvNWE2Nzg3YmEzMjU2NGU3YzJmM2EwY2U2NDQ5OGVjYmIyM2I4OTg0NWU1YTY2YjVjZWM3NzM2ZjcyOWVkMzcifX19"}]}}}

API Usage

GET https://headdb.org/api/head/13c01584-b6e8-3e5e-aff8-404345cf4414

{
  "name": "X",
  "uuid": "13c01584-b6e8-3e5e-aff8-404345cf4414",
  "value": "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvNWE2Nzg3YmEzMjU2NGU3YzJmM2EwY2U2NDQ5OGVjYmIyM2I4OTg0NWU1YTY2YjVjZWM3NzM2ZjcyOWVkMzcifX19",
  "valueDecoded": {
    "textures": {
      "SKIN": {
        "url": "http://textures.minecraft.net/texture/5a6787ba32564e7c2f3a0ce64498ecbb23b89845e5a66b5cec7736f729ed37"
      }
    }
  },
  "command": "/give @p skull 1 3 {display:{Name:\"X\",Lore:[\"Skull from HeadDB.org\"]},SkullOwner:{Id:\"13c01584-b6e8-3e5e-aff8-404345cf4414\",Properties:{textures:[{Value:\"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvNWE2Nzg3YmEzMjU2NGU3YzJmM2EwY2U2NDQ5OGVjYmIyM2I4OTg0NWU1YTY2YjVjZWM3NzM2ZjcyOWVkMzcifX19\"}]}}}"
}

Minecraft Head Database

GET https://headdb.org/api/head/13c01584-b6e8-3e5e-aff8-404345cf4414