diff --git a/cardano-api/internal/Cardano/Api/Certificate.hs b/cardano-api/internal/Cardano/Api/Certificate.hs
index 14516b35c3..5ba5cbd09a 100644
--- a/cardano-api/internal/Cardano/Api/Certificate.hs
+++ b/cardano-api/internal/Cardano/Api/Certificate.hs
@@ -270,8 +270,8 @@ instance EraCast Certificate where
     case cert  of
       ShelleyRelatedCertificate sourceWit sourceLedgerCert ->
         shelleyToBabbageEraConstraints sourceWit
-          $ inEraFeature targetEra
-              ( inEraFeature targetEra
+          $ eraInEon targetEra
+              ( eraInEon targetEra
                   ( Left $ EraCastError
                       { originalValue = cert
                       , fromEra = shelleyToBabbageEraToCardanoEra sourceWit
@@ -299,8 +299,8 @@ instance EraCast Certificate where
 
       ConwayCertificate sourceWit sourceLedgerCert ->
         conwayEraOnwardsConstraints sourceWit
-          $ inEraFeature targetEra
-              ( inEraFeature targetEra
+          $ eraInEon targetEra
+              ( eraInEon targetEra
                   ( Left $ EraCastError
                       { originalValue = cert
                       , fromEra = conwayEraOnwardsToCardanoEra sourceWit
diff --git a/cardano-api/internal/Cardano/Api/Convenience/Query.hs b/cardano-api/internal/Cardano/Api/Convenience/Query.hs
index f81d613e69..e2bc9c63fa 100644
--- a/cardano-api/internal/Cardano/Api/Convenience/Query.hs
+++ b/cardano-api/internal/Cardano/Api/Convenience/Query.hs
@@ -126,7 +126,7 @@ queryStateForBalancedTx era allTxIns certs = runExceptT $ do
       & onLeft (left . QueryEraMismatch)
 
   drepDelegDeposits <-
-    inEraFeature @ConwayEraOnwards era (pure mempty) $ \_ ->
+    eraInEon @ConwayEraOnwards era (pure mempty) $ \_ ->
       Map.map (fromShelleyLovelace . drepDeposit) <$>
       (lift (queryDRepState qeInMode sbe drepCreds)
           & onLeft (left . QceUnsupportedNtcVersion)
diff --git a/cardano-api/internal/Cardano/Api/Eras.hs b/cardano-api/internal/Cardano/Api/Eras.hs
index 87110ec11c..0389861401 100644
--- a/cardano-api/internal/Cardano/Api/Eras.hs
+++ b/cardano-api/internal/Cardano/Api/Eras.hs
@@ -22,7 +22,7 @@ module Cardano.Api.Eras
 
     -- * IsEon
   , Eon(..)
-  , inEraFeature
+  , eraInEon
   , inEraFeatureMaybe
   , maybeFeatureInEra
 
diff --git a/cardano-api/internal/Cardano/Api/Eras/Core.hs b/cardano-api/internal/Cardano/Api/Eras/Core.hs
index 397e350e54..673bcd1ff0 100644
--- a/cardano-api/internal/Cardano/Api/Eras/Core.hs
+++ b/cardano-api/internal/Cardano/Api/Eras/Core.hs
@@ -31,7 +31,7 @@ module Cardano.Api.Eras.Core
 
     -- * IsEon
   , Eon(..)
-  , inEraFeature
+  , eraInEon
   , inEraFeatureMaybe
   , maybeFeatureInEra
   , featureInShelleyBasedEra
@@ -143,13 +143,13 @@ class Eon (eon :: Type -> Type) where
     -> CardanoEra era -- ^ Era to check
     -> a              -- ^ The value to use
 
-inEraFeature :: ()
+eraInEon :: ()
   => Eon eon
   => CardanoEra era   -- ^ Era to check
   -> a                -- ^ Value to use if the eon does not include the era
   -> (eon era -> a)   -- ^ Function to get the value to use if the eon includes the era
   -> a                -- ^ The value to use
-inEraFeature era no yes =
+eraInEon era no yes =
   inEonEra no yes era
 
 inEraFeatureMaybe :: ()
@@ -158,7 +158,7 @@ inEraFeatureMaybe :: ()
   -> (eon era -> a)   -- ^ Function to get the value to use if the eon includes the era
   -> Maybe a          -- ^ The value to use
 inEraFeatureMaybe era yes =
-  inEraFeature era Nothing (Just . yes)
+  eraInEon era Nothing (Just . yes)
 
 maybeFeatureInEra :: ()
   => Eon eon
diff --git a/cardano-api/src/Cardano/Api.hs b/cardano-api/src/Cardano/Api.hs
index 382d7c97f7..9a69797c34 100644
--- a/cardano-api/src/Cardano/Api.hs
+++ b/cardano-api/src/Cardano/Api.hs
@@ -29,7 +29,7 @@ module Cardano.Api (
 
     -- * Feature support
     Eon(..),
-    inEraFeature,
+    eraInEon,
     inEraFeatureMaybe,
     maybeFeatureInEra,