diff --git a/src/clients/directory/presence.rs b/src/clients/directory/presence.rs
index 65148097e6..77e114aaa5 100644
--- a/src/clients/directory/presence.rs
+++ b/src/clients/directory/presence.rs
@@ -11,10 +11,10 @@ pub struct CocoPresence {
 #[derive(Deserialize, Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct MixNodePresence {
-    host: String,
-    pub_key: String,
-    layer: u64,
-    last_seen: i64,
+    pub host: String,
+    pub pub_key: String,
+    pub layer: u64,
+    pub last_seen: i64,
 }
 
 #[derive(Deserialize, Serialize)]
diff --git a/src/clients/directory/requests/presence_mixnodes_post.rs b/src/clients/directory/requests/presence_mixnodes_post.rs
index e69de29bb2..4bb0686ba3 100644
--- a/src/clients/directory/requests/presence_mixnodes_post.rs
+++ b/src/clients/directory/requests/presence_mixnodes_post.rs
@@ -0,0 +1,87 @@
+use crate::clients::directory::presence::MixNodePresence;
+use reqwest::Response;
+
+pub struct Request {
+    base_url: String,
+    path: String,
+}
+
+pub trait PresenceMixNodesPoster {
+    fn new(base_url: String) -> Self;
+    fn post(&self, presence: MixNodePresence) -> Result<Response, reqwest::Error>;
+}
+
+impl PresenceMixNodesPoster for Request {
+    fn new(base_url: String) -> Self {
+        Request {
+            base_url,
+            path: "/api/presence/mixnodes".to_string(),
+        }
+    }
+
+    fn post(&self, presence: MixNodePresence) -> Result<Response, reqwest::Error> {
+        let url = format!("{}{}", self.base_url, self.path);
+        let client = reqwest::Client::new();
+        let p = client.post(&url).json(&presence).send()?;
+        Ok(p)
+    }
+}
+
+#[cfg(test)]
+mod metrics_get_request {
+    use super::*;
+
+    #[cfg(test)]
+    use mockito::mock;
+
+    #[cfg(test)]
+    mod on_a_400_status {
+        use super::*;
+
+        #[test]
+        fn it_returns_an_error() {
+            let _m = mock("POST", "/api/presence/mixnodes")
+                .with_status(400)
+                .create();
+            let req = Request::new(mockito::server_url());
+            let presence = fixtures::new_presence();
+            let result = req.post(presence);
+            assert_eq!(400, result.unwrap().status());
+            _m.assert();
+        }
+    }
+
+    #[cfg(test)]
+    mod on_a_200 {
+        use super::*;
+        #[test]
+        fn it_returns_a_response_with_201() {
+            let json = r#"{
+                          "ok": true
+                      }"#;
+            let _m = mock("POST", "/api/presence/mixnodes")
+                .with_status(201)
+                .with_body(json)
+                .create();
+            let req = Request::new(mockito::server_url());
+            let presence = fixtures::new_presence();
+            let result = req.post(presence);
+            assert_eq!(true, result.is_ok());
+            _m.assert();
+        }
+    }
+
+    #[cfg(test)]
+    mod fixtures {
+        use crate::clients::directory::presence::MixNodePresence;
+
+        pub fn new_presence() -> MixNodePresence {
+            MixNodePresence {
+                host: "foo.com".to_string(),
+                pub_key: "abc".to_string(),
+                last_seen: 666,
+                layer: 1,
+            }
+        }
+    }
+}