diff --git a/src/spootnik/reporter/alert.clj b/src/spootnik/reporter/alert.clj
index 88a604c..3506de0 100644
--- a/src/spootnik/reporter/alert.clj
+++ b/src/spootnik/reporter/alert.clj
@@ -6,12 +6,8 @@
   (:import (java.time Instant)))
 
 (defprotocol Alert
-  (send! [client alert]
-    "Sends `alert`, conforming to `:spootnik.reporter/alert`, via `client` to
-    alertmanager instance")
-  (msend! [client alerts]
-    "Sends `alerts` in bulk, conforming to `:spootnik.reporter/alerts`, via
-    `client` to alertmanager instance"))
+  (-send! [client alert])
+  (-msend! [client alerts]))
 
 (s/def ::named (s/or :k ident? :s string?))
 
@@ -46,9 +42,6 @@
 (defn ->alert
   [{:as alert :keys [name labels annotations generator-url delay-after-ms]
     :or {delay-after-ms (* 60 1000 15)}}]
-  (when-not (s/valid? :spootnik.reporter/alert alert)
-    (ex/ex-incorrect! "Invalid alert format"
-                      (s/explain-data :spootnik.reporter/alert alert)))
   (let [t (Instant/now)]
     (cond-> {:startsAt (str t)
              :endsAt (str (.plusMillis t (* delay-after-ms)))
@@ -67,12 +60,32 @@
 
 (defrecord AlephClient [])
 
+(s/def :spootnik.reporter.alert.client/server string?)
+(s/def :spootnik.reporter.alert/client
+  (s/keys :req-un [:spootnik.reporter.alert.client/server]))
+
 (extend-protocol Alert
   AlephClient
-  (msend! [client alerts]
-    @(http/post "/api/v2/alerts"
+  (-msend! [client alerts]
+    @(http/post (format "%s/api/v2/alerts" (:server client))
                 (into {:body (alerts-body alerts)
                        :headers {"Content-Type" "application/json; charset=utf-8"}}
                       client)))
-  (send! [client alert]
-    (msend! client [alert])))
+  (-send! [client alert]
+    (-msend! client [alert])))
+
+(defn send!
+  "Sends `alert`, conforming to `:spootnik.reporter/alert`, via `client` to
+  alertmanager instance"
+  [client alert]
+  (ex/assert-spec-valid :spootnik.reporter.alert/client client)
+  (ex/assert-spec-valid :spootnik.reporter/alert alert)
+  (-send! client alert))
+
+(defn msend!
+  "Sends `alerts` in bulk, conforming to `:spootnik.reporter/alerts`, via `client`
+  to alertmanager instance"
+  [client alerts]
+  (ex/assert-spec-valid :spootnik.reporter.alert/client client)
+  (ex/assert-spec-valid :spootnik.reporter/alerts alerts)
+  (-msend! client alerts))