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diff --git a/lib/Web/OpenWeatherMap/API.hs b/lib/Web/OpenWeatherMap/API.hs
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+++ b/lib/Web/OpenWeatherMap/API.hs
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+{-|
+Direct API functions.
+For API key (a.k.a appid) refer to <http://openweathermap.org/appid>.
+-}
+
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE TypeOperators #-}
+
+module Web.OpenWeatherMap.API (
+  weatherByName,
+  weatherByCoord
+) where
+
+import Data.Proxy (Proxy(..))
+
+import Servant.API ((:>), (:<|>)(..), JSON, Get, QueryParam)
+import Servant.Client (client)
+import Servant.Common.Req (ClientM)
+
+import Web.OpenWeatherMap.Types.CurrentWeather (CurrentWeather)
+
+
+type GetCurrentWeather = AppId :> Get '[JSON] CurrentWeather
+type AppId = QueryParam "appid" String
+
+type API
+     = "weather" :> QueryParam "q" String :> GetCurrentWeather
+  :<|> "weather" :> QueryParam "lat" Double :> QueryParam "lon" Double
+                 :> GetCurrentWeather
+
+-- | Request current weather in the city.
+weatherByName
+  :: Maybe String  -- ^ City name, e. g. \"Moscow\" or \"Moscow,ru\".
+  -> Maybe String  -- ^ API key.
+  -> ClientM CurrentWeather
+
+-- | Request current weather at the geographic coordinates (in decimal degrees).
+weatherByCoord
+  :: Maybe Double  -- ^ Latitude, e. g. 55.7522200 for Moscow.
+  -> Maybe Double  -- ^ Longitude, e. g. 37.6155600 for Moscow.
+  -> Maybe String  -- ^ API key.
+  -> ClientM CurrentWeather
+
+weatherByName :<|> weatherByCoord = client (Proxy :: Proxy API)
+