diff --git a/spago.dhall b/spago.dhall
index 8efaaaf..df7a943 100644
--- a/spago.dhall
+++ b/spago.dhall
@@ -17,13 +17,16 @@ to generate this file without the comments in this block.
   , "console"
   , "effect"
   , "either"
+  , "foreign"
   , "http-methods"
+  , "lists"
   , "maybe"
   , "media-types"
   , "prelude"
   , "psci-support"
   , "simple-json"
   , "strings"
+  , "transformers"
   ]
 , packages = ./packages.dhall
 , sources = [ "src/**/*.purs" ]
diff --git a/src/GraphQL.purs b/src/GraphQL.purs
index a94b9cc..e6acad2 100644
--- a/src/GraphQL.purs
+++ b/src/GraphQL.purs
@@ -50,7 +50,7 @@ type ParsingErrorInfo =
   , jsonParsingError :: NonEmptyList ForeignError
   }
 
-type GraphQLClient'
+type GraphQLClient''
   (operation :: GraphQL)
   (gql :: Symbol)
   (i :: Row Type)
@@ -72,7 +72,27 @@ type GraphQLClient'
 type GraphQLClient =
   forall (operation :: GraphQL)
     (gql :: Symbol) (i :: Row Type) (o :: Row Type) (m :: Type -> Type) (e :: Type)
-   . GraphQLClient' operation gql i o m e
+   . GraphQLReqRes operation gql i o
+  => IsSymbol gql
+  => JSON.WriteForeign { | i }
+  => JSON.ReadForeign { | o }
+  => MonadAff m
+  => MonadThrow e m
+  => (NetworkErrorInfo -> e)
+  -> (ParsingErrorInfo -> e)
+  -> Gql operation
+  -> Record i
+  -> m { | o }
+
+type GraphQLClientAff =
+  forall (operation :: GraphQL) (gql :: Symbol) (i :: Row Type) (o :: Row Type)
+   . GraphQLReqRes operation gql i o
+  => IsSymbol gql
+  => JSON.WriteForeign { | i }
+  => JSON.ReadForeign { | o }
+  => Gql operation
+  -> Record i
+  -> Aff { | o }
 
 graphQL
   :: Endpoint
diff --git a/test/Main.purs b/test/Main.purs
index 0a035b3..ae29621 100644
--- a/test/Main.purs
+++ b/test/Main.purs
@@ -1,12 +1,13 @@
 module Test.Main where
 
 import Prelude
+
 import Data.Foldable (for_)
 import Data.Maybe (Maybe(..))
 import Effect (Effect)
 import Effect.Aff (Milliseconds(..), launchAff_)
 import Effect.Class.Console as Log
-import GraphQL.FunDeps (class GraphQLReqRes, Gql(..), GraphQL, GraphQLClient, graphQL)
+import GraphQL.FunDeps (class GraphQLReqRes, Gql(..), GraphQL, GraphQLClientAff, graphQL)
 import Test.Spec (describe, it)
 import Test.Spec.Reporter.Console (consoleReporter)
 import Test.Spec.Runner (defaultConfig, runSpec')
@@ -48,7 +49,7 @@ instance graphqlReactFinlandConference ::
         }
     )
 
-client :: GraphQLClient
+client :: GraphQLClientAff
 client = graphQL "https://api.react-finland.fi/graphql" []
 
 main ∷ Effect Unit