diff --git a/src/rinha_2025.gleam b/src/rinha_2025.gleam
index 102d6d4..d3f3c84 100644
--- a/src/rinha_2025.gleam
+++ b/src/rinha_2025.gleam
@@ -12,29 +12,37 @@ import valkyrie
 import web/server
 import web/web
 
-pub fn main() -> Nil {
-  let redis_host = util.get_env_var("REDIS_CONN", "localhost")
-  let providers_env = util.get_env_var("PROVIDERS", "")
-  let assert Ok(processor_time) =
-    util.get_env_var("PROCESSOR_TIME", "100")
-    |> int.parse
-
-  let providers =
-    providers_env
+fn get_providers() -> List(provider.ProviderConfig) {
+  util.get_env_var("PROVIDERS", "")
     |> string.split(",")
-    |> list.filter(fn(url) { "" != url })
-    |> list.map(fn(url) {
-      let provider_name = case string.contains(url, contain: "default") {
-        True -> "default"
-        _ -> "fallback"
-      }
+    |> list.filter_map(fn(url) {
+      use <- bool.guard(when: "" == url, return: Error("invalid"))
+
+      use <- bool.guard(
+        when: string.contains(url, contain: "default"),
+        return: Ok(#(url, "default"))
+      )
+
+      Ok(#(url, "fallback"))
+    })
+    |> list.map(fn(data) {
+      let #(url, provider) = data
       provider.ProviderConfig(
         url: url,
         min_response_time: -1,
-        name: provider_name,
+        name: provider,
       )
     })
-  let has_providers = list.length(providers) > 0
+}
+
+pub fn main() -> Nil {
+  let redis_host = util.get_env_var("REDIS_CONN", "localhost")
+  let assert Ok(processor_time) =
+    util.get_env_var("PROCESSOR_TIME", "100")
+    |> int.parse
+  let providers = get_providers()
+
+  let has_providers = providers != []
 
   let #(valkey_pool_name, valkey_pool) =
     redis.create_supervised_pool(redis_host)