diff --git a/lib/actions/message-actions.js b/lib/actions/message-actions.js
--- a/lib/actions/message-actions.js
+++ b/lib/actions/message-actions.js
@@ -1,9 +1,7 @@
 // @flow
 
-import invariant from 'invariant';
 import * as React from 'react';
 
-import type { CallSingleKeyserverEndpointResultInfo } from '../keyserver-conn/call-single-keyserver-endpoint.js';
 import {
   extractKeyserverIDFromIDOptional,
   extractKeyserverIDFromID,
@@ -183,12 +181,6 @@
     callKeyserverEndpoint: CallKeyserverEndpoint,
   ): ((input: SendTextMessageInput) => Promise<SendMessageResult>) =>
   async input => {
-    let resultInfo;
-    const getResultInfo = (
-      passedResultInfo: CallSingleKeyserverEndpointResultInfo,
-    ) => {
-      resultInfo = passedResultInfo;
-    };
     const { threadID, localID, text, sidebarCreation } = input;
     let payload = { threadID, localID, text };
     if (sidebarCreation) {
@@ -201,19 +193,10 @@
     const responses = await callKeyserverEndpoint(
       'create_text_message',
       requests,
-      {
-        getResultInfo,
-      },
-    );
-    const resultInterface = resultInfo?.interface;
-    invariant(
-      resultInterface,
-      'getResultInfo not called before callKeyserverEndpoint resolves',
     );
     return {
       id: responses[keyserverID].newMessageInfo.id,
       time: responses[keyserverID].newMessageInfo.time,
-      interface: resultInterface,
     };
   };
 
@@ -242,12 +225,6 @@
     callKeyserverEndpoint: CallKeyserverEndpoint,
   ): ((input: SendMultimediaMessageInput) => Promise<SendMessageResult>) =>
   async input => {
-    let resultInfo;
-    const getResultInfo = (
-      passedResultInfo: CallSingleKeyserverEndpointResultInfo,
-    ) => {
-      resultInfo = passedResultInfo;
-    };
     const { threadID, localID, mediaMessageContents, sidebarCreation } = input;
     let payload = { threadID, localID, mediaMessageContents };
     if (sidebarCreation) {
@@ -260,17 +237,10 @@
     const responses = await callKeyserverEndpoint(
       'create_multimedia_message',
       requests,
-      { getResultInfo },
-    );
-    const resultInterface = resultInfo?.interface;
-    invariant(
-      resultInterface,
-      'getResultInfo not called before callKeyserverEndpoint resolves',
     );
     return {
       id: responses[keyserverID].newMessageInfo.id,
       time: responses[keyserverID].newMessageInfo.time,
-      interface: resultInterface,
     };
   };
 
@@ -294,12 +264,6 @@
     input: LegacySendMultimediaMessageInput,
   ) => Promise<SendMessageResult>) =>
   async input => {
-    let resultInfo;
-    const getResultInfo = (
-      passedResultInfo: CallSingleKeyserverEndpointResultInfo,
-    ) => {
-      resultInfo = passedResultInfo;
-    };
     const { threadID, localID, mediaIDs, sidebarCreation } = input;
     let payload = { threadID, localID, mediaIDs };
     if (sidebarCreation) {
@@ -312,17 +276,10 @@
     const responses = await callKeyserverEndpoint(
       'create_multimedia_message',
       requests,
-      { getResultInfo },
-    );
-    const resultInterface = resultInfo?.interface;
-    invariant(
-      resultInterface,
-      'getResultInfo not called before callKeyserverEndpoint resolves',
     );
     return {
       id: responses[keyserverID].newMessageInfo.id,
       time: responses[keyserverID].newMessageInfo.time,
-      interface: resultInterface,
     };
   };
 
@@ -342,13 +299,6 @@
     callKeyserverEndpoint: CallKeyserverEndpoint,
   ): ((input: SendReactionMessageRequest) => Promise<SendMessageResult>) =>
   async input => {
-    let resultInfo;
-    const getResultInfo = (
-      passedResultInfo: CallSingleKeyserverEndpointResultInfo,
-    ) => {
-      resultInfo = passedResultInfo;
-    };
-
     const keyserverID = extractKeyserverIDFromID(input.threadID);
     const requests = {
       [keyserverID]: {
@@ -363,19 +313,10 @@
     const responses = await callKeyserverEndpoint(
       'create_reaction_message',
       requests,
-      { getResultInfo },
     );
-
-    const resultInterface = resultInfo?.interface;
-    invariant(
-      resultInterface,
-      'getResultInfo not called before callKeyserverEndpoint resolves',
-    );
-
     return {
       id: responses[keyserverID].newMessageInfo.id,
       time: responses[keyserverID].newMessageInfo.time,
-      interface: resultInterface,
     };
   };
 
diff --git a/lib/keyserver-conn/call-single-keyserver-endpoint.js b/lib/keyserver-conn/call-single-keyserver-endpoint.js
--- a/lib/keyserver-conn/call-single-keyserver-endpoint.js
+++ b/lib/keyserver-conn/call-single-keyserver-endpoint.js
@@ -36,9 +36,6 @@
   // null timeout means no timeout, which is the default for
   // defaultPerformHTTPMultipartUpload
   +timeout: ?number, // in milliseconds
-  // getResultInfo will be called right before callSingleKeyserverEndpoint
-  // successfully resolves and includes additional information about the request
-  +getResultInfo: (resultInfo: CallSingleKeyserverEndpointResultInfo) => mixed,
   +performHTTPMultipartUpload: boolean | PerformHTTPMultipartUpload,
   // onProgress and abortHandler only work with performHTTPMultipartUpload
   +onProgress: (percent: number) => void,
@@ -48,11 +45,6 @@
   +urlPrefixOverride: string,
 }>;
 
-export type CallSingleKeyserverEndpointResultInfoInterface = 'socket' | 'REST';
-export type CallSingleKeyserverEndpointResultInfo = {
-  +interface: CallSingleKeyserverEndpointResultInfoInterface,
-};
-
 export type CallSingleKeyserverEndpointResponse = Partial<{
   +cookieChange: ServerSessionChange,
   +currentUserInfo: CurrentUserInfo,
@@ -114,9 +106,7 @@
     !options?.urlPrefixOverride
   ) {
     try {
-      const result = await socketAPIHandler({ endpoint, input });
-      options?.getResultInfo?.({ interface: 'socket' });
-      return result;
+      return socketAPIHandler({ endpoint, input });
     } catch (e) {
       if (endpointIsSocketOnly(endpoint)) {
         throw e;
@@ -245,7 +235,6 @@
   if (error) {
     throw new ServerError(error, payload);
   }
-  options?.getResultInfo?.({ interface: 'REST' });
   return json;
 }
 
diff --git a/lib/types/message-types.js b/lib/types/message-types.js
--- a/lib/types/message-types.js
+++ b/lib/types/message-types.js
@@ -143,7 +143,6 @@
 } from './messages/update-relationship.js';
 import { rawUpdateRelationshipMessageInfoValidator } from './messages/update-relationship.js';
 import { type RelativeUserInfo, type UserInfos } from './user-types.js';
-import type { CallSingleKeyserverEndpointResultInfoInterface } from '../keyserver-conn/call-single-keyserver-endpoint.js';
 import { values } from '../utils/objects.js';
 import { tID, tNumber, tShape, tUserID } from '../utils/validation-utils.js';
 
@@ -606,7 +605,6 @@
 export type SendMessageResult = {
   +id: string,
   +time: number,
-  +interface: CallSingleKeyserverEndpointResultInfoInterface,
 };
 
 export type SendMessagePayload = {
@@ -614,7 +612,6 @@
   +serverID: string,
   +threadID: string,
   +time: number,
-  +interface: CallSingleKeyserverEndpointResultInfoInterface,
 };
 
 export type SendTextMessageRequest = {
diff --git a/native/chat/reaction-message-utils.js b/native/chat/reaction-message-utils.js
--- a/native/chat/reaction-message-utils.js
+++ b/native/chat/reaction-message-utils.js
@@ -104,7 +104,6 @@
             serverID: result.id,
             threadID,
             time: result.time,
-            interface: result.interface,
           };
         } catch (e) {
           Alert.alert(
diff --git a/native/input/input-state-container.react.js b/native/input/input-state-container.react.js
--- a/native/input/input-state-container.react.js
+++ b/native/input/input-state-container.react.js
@@ -410,7 +410,6 @@
         serverID: result.id,
         threadID,
         time: result.time,
-        interface: result.interface,
       };
     } catch (e) {
       const copy = cloneError(e);
@@ -650,7 +649,6 @@
         serverID: result.id,
         threadID: messageInfo.threadID,
         time: result.time,
-        interface: result.interface,
       };
     } catch (e) {
       const copy = cloneError(e);
diff --git a/web/chat/reaction-message-utils.js b/web/chat/reaction-message-utils.js
--- a/web/chat/reaction-message-utils.js
+++ b/web/chat/reaction-message-utils.js
@@ -9,7 +9,6 @@
   sendReactionMessageActionTypes,
 } from 'lib/actions/message-actions.js';
 import { useModalContext } from 'lib/components/modal-provider.react.js';
-import type { CallSingleKeyserverEndpointResultInfoInterface } from 'lib/keyserver-conn/call-single-keyserver-endpoint.js';
 import type { ReactionInfo } from 'lib/selectors/chat-selectors';
 import {
   dmOperationSpecificationTypes,
@@ -106,14 +105,11 @@
           });
           const serverID: string = result.id;
           const time: number = result.time;
-          const interfaceInfo: CallSingleKeyserverEndpointResultInfoInterface =
-            result.interface;
           return {
             localID,
             serverID,
             threadID,
             time,
-            interface: interfaceInfo,
           };
         } catch (e) {
           pushModal(
diff --git a/web/input/input-state-container.react.js b/web/input/input-state-container.react.js
--- a/web/input/input-state-container.react.js
+++ b/web/input/input-state-container.react.js
@@ -584,7 +584,6 @@
         serverID: result.id,
         threadID,
         time: result.time,
-        interface: result.interface,
       };
     } catch (e) {
       const copy = cloneError(e);
@@ -1446,7 +1445,6 @@
         serverID: result.id,
         threadID: messageInfo.threadID,
         time: result.time,
-        interface: result.interface,
       };
     } catch (e) {
       const copy = cloneError(e);