diff --git a/src/main/java/org/prebid/server/bidder/mobkoi/MobkoiBidder.java b/src/main/java/org/prebid/server/bidder/mobkoi/MobkoiBidder.java
index 97cd481b235..dbf82da1b4f 100644
--- a/src/main/java/org/prebid/server/bidder/mobkoi/MobkoiBidder.java
+++ b/src/main/java/org/prebid/server/bidder/mobkoi/MobkoiBidder.java
@@ -24,8 +24,6 @@
 import org.prebid.server.util.BidderUtil;
 import org.prebid.server.util.HttpUtil;
 
-import java.net.URI;
-import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
@@ -60,11 +58,9 @@ public Result<List<HttpRequest<BidRequest>>> makeHttpRequests(BidRequest bidRequ
             return Result.withError(BidderError.badInput(e.getMessage()));
         }
 
-        final String selectedEndpointUrl = resolveEndpoint(extImpMobkoi.getAdServerBaseUrl());
-
         return Result.withValue(BidderUtil.defaultRequest(
                 modifyBidRequest(bidRequest, modifiedFirstImp),
-                selectedEndpointUrl,
+                endpointUrl,
                 mapper));
     }
 
@@ -91,19 +87,6 @@ private Imp modifyImp(Imp firstImp, ExtImpMobkoi extImpMobkoi) {
                     + "req.imp[0].ext.Bidder.placementId");
     }
 
-    // url is already validated with `bidder-params` json schema
-    private String resolveEndpoint(String customUri) {
-        if (customUri == null) {
-            return endpointUrl;
-        }
-        try {
-            final URI uri = new URI(customUri);
-            return uri.resolve("/bid").toString();
-        } catch (IllegalArgumentException | URISyntaxException e) {
-            return endpointUrl;
-        }
-    }
-
     private static BidRequest modifyBidRequest(BidRequest bidRequest, Imp modifiedFirstImp) {
         final User user = modifyUser(bidRequest.getUser());
         final List<Imp> imps = updateFirstImpWith(bidRequest.getImp(), modifiedFirstImp);
diff --git a/src/main/java/org/prebid/server/proto/openrtb/ext/request/mobkoi/ExtImpMobkoi.java b/src/main/java/org/prebid/server/proto/openrtb/ext/request/mobkoi/ExtImpMobkoi.java
index 0faa3d1efc8..ac8009a76d2 100644
--- a/src/main/java/org/prebid/server/proto/openrtb/ext/request/mobkoi/ExtImpMobkoi.java
+++ b/src/main/java/org/prebid/server/proto/openrtb/ext/request/mobkoi/ExtImpMobkoi.java
@@ -8,7 +8,4 @@ public class ExtImpMobkoi {
 
     @JsonProperty("placementId")
     String placementId;
-
-    @JsonProperty("adServerBaseUrl")
-    String adServerBaseUrl;
 }
diff --git a/src/main/resources/static/bidder-params/mobkoi.json b/src/main/resources/static/bidder-params/mobkoi.json
index 8286229b035..6858a48a679 100644
--- a/src/main/resources/static/bidder-params/mobkoi.json
+++ b/src/main/resources/static/bidder-params/mobkoi.json
@@ -7,11 +7,6 @@
     "placementId": {
       "type": "string",
       "description": "Placement ID"
-    },
-    "adServerBaseUrl": {
-      "type": "string",
-      "description": "Mobkoi's ad server url",
-      "pattern": "^https?://[^.]+\\.mobkoi\\.com$"
     }
   }
 }
diff --git a/src/test/java/org/prebid/server/bidder/mobkoi/MobkoiBidderTest.java b/src/test/java/org/prebid/server/bidder/mobkoi/MobkoiBidderTest.java
index 1c98d21a3ca..7d46ce2a0a8 100644
--- a/src/test/java/org/prebid/server/bidder/mobkoi/MobkoiBidderTest.java
+++ b/src/test/java/org/prebid/server/bidder/mobkoi/MobkoiBidderTest.java
@@ -63,7 +63,7 @@ public void makeHttpRequestsShouldReturnErrorWhenRequestHasInvalidExtImpression(
     @Test
     public void makeHttpRequestsShouldReturnErrorWhenRequestHasMissingTagIdAndPlacementId() {
         // given
-        final ObjectNode mobkoiExt = impExt(null, null);
+        final ObjectNode mobkoiExt = impExt(null);
         final BidRequest bidRequest = givenBidRequest(impBuilder -> impBuilder.ext(mobkoiExt));
 
         // when
@@ -79,7 +79,7 @@ public void makeHttpRequestsShouldReturnErrorWhenRequestHasMissingTagIdAndPlacem
     @Test
     public void makeHttpRequestsShouldAddPlacementIdOnlyInFirstImpressionTagId() {
         // given
-        final ObjectNode mobkoiExt = impExt("pid", null);
+        final ObjectNode mobkoiExt = impExt("pid");
         final Imp givenImp1 = givenImp(impBuilder -> impBuilder.ext(mobkoiExt));
         final Imp givenImp2 = givenImp(identity());
         final BidRequest bidRequest = BidRequest.builder().imp(asList(givenImp1, givenImp2)).build();
@@ -95,48 +95,6 @@ public void makeHttpRequestsShouldAddPlacementIdOnlyInFirstImpressionTagId() {
                 .containsExactly("pid", null);
     }
 
-    @Test
-    public void makeHttpRequestsShouldUseConstructorEndpointWhenNoCustomEndpointIsDefinedInMobkoiExtension() {
-        // given
-        final ObjectNode mobkoiExt = impExt("pid", null);
-        final BidRequest bidRequest = givenBidRequest(impBuilder -> impBuilder.ext(mobkoiExt));
-
-        // when
-        final Result<List<HttpRequest<BidRequest>>> results = target.makeHttpRequests(bidRequest);
-
-        // then
-        assertThat(results.getValue()).extracting(HttpRequest::getUri).containsExactly("https://test.endpoint.com/bid");
-        assertThat(results.getErrors()).isEmpty();
-    }
-
-    @Test
-    public void makeHttpRequestsShouldConstructWithDefaultEndpointWhenTheCustomURLIsInvalidInMobkoiExtension() {
-        // given
-        final ObjectNode mobkoiExt = impExt("pid", "invalid URI");
-        final BidRequest bidRequest = givenBidRequest(impBuilder -> impBuilder.ext(mobkoiExt));
-
-        // when
-        final Result<List<HttpRequest<BidRequest>>> result = target.makeHttpRequests(bidRequest);
-
-        // then
-        assertThat(result.getValue()).extracting(HttpRequest::getUri).containsExactly("https://test.endpoint.com/bid");
-        assertThat(result.getErrors()).isEmpty();
-    }
-
-    @Test
-    public void makeHttpRequestsShouldUseCustomEndpointWhenDefinedInMobkoiExtension() {
-        // given
-        final ObjectNode mobkoiExt = impExt("pid", "https://custom.endpoint.com");
-        final BidRequest bidRequest = givenBidRequest(impBuilder -> impBuilder.ext(mobkoiExt));
-
-        // when
-        final Result<List<HttpRequest<BidRequest>>> result = target.makeHttpRequests(bidRequest);
-
-        // then
-        assertThat(result.getValue()).extracting(HttpRequest::getUri).containsExactly("https://custom.endpoint.com/bid");
-        assertThat(result.getErrors()).isEmpty();
-    }
-
     @Test
     public void makeHttpRequestsShouldOverrideUserExtAndSetConsent() {
         // given
@@ -235,11 +193,11 @@ private static BidRequest givenBidRequest(
     }
 
     private static Imp givenImp(UnaryOperator<Imp.ImpBuilder> impCustomizer) {
-        return impCustomizer.apply(Imp.builder().id("imp_id").ext(impExt("placementIdValue", null))).build();
+        return impCustomizer.apply(Imp.builder().id("imp_id").ext(impExt("placementIdValue"))).build();
     }
 
-    private static ObjectNode impExt(String placementId, String adServerBaseUrl) {
-        return mapper.valueToTree(ExtPrebid.of(null, ExtImpMobkoi.of(placementId, adServerBaseUrl)));
+    private static ObjectNode impExt(String placementId) {
+        return mapper.valueToTree(ExtPrebid.of(null, ExtImpMobkoi.of(placementId)));
     }
 
     private static BidResponse givenBidResponse(UnaryOperator<Bid.BidBuilder> bidCustomizer) {