diff --git a/CHANGELOG.md b/CHANGELOG.md
index 06650d76..ef09110d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
-## [1.1.9] - 2021-01-29
+
+## [1.2.1] - 2021-02-05
+
+### Added
+
+- UserEvents support to HTTP request. 
+
+## [1.2.0] - 2021-01-29
 
 ### Added
 
diff --git a/dist/api/HttpServer.js b/dist/api/HttpServer.js
index 22fdad08..c36ba81a 100644
--- a/dist/api/HttpServer.js
+++ b/dist/api/HttpServer.js
@@ -4,9 +4,10 @@ var _api = _interopRequireDefault(require("./routes/api"));
 var _doc = _interopRequireDefault(require("./routes/doc"));
 var _config = _interopRequireDefault(require("../lib/config"));function _interopRequireDefault(obj) {return obj && obj.__esModule ? obj : { default: obj };}
 
-const HttpServer = ({ api, status, log }) => {
+const HttpServer = ({ api, status, log }, send) => {
   const app = (0, _express.default)();
   const httpServer = _http.default.Server(app);
+
   app.set('etag', false);
   app.set('x-powered-by', false);
 
@@ -24,7 +25,7 @@ const HttpServer = ({ api, status, log }) => {
     res.send(data);
   });
 
-  app.use('/api', (0, _api.default)({ log, api }));
+  app.use('/api', (0, _api.default)({ log, api }, send));
 
   if (_config.default.api.exposeDoc) {
     app.use('/doc', (0, _doc.default)({ log, app }));
@@ -32,7 +33,7 @@ const HttpServer = ({ api, status, log }) => {
 
   // 404
   app.use((req, res, next) => res.status(404).send());
-  return httpServer;
+  return { httpServer, app };
 };exports.HttpServer = HttpServer;var _default =
 
 HttpServer;exports.default = _default;
\ No newline at end of file
diff --git a/dist/api/Status.js b/dist/api/Status.js
index 0cb39af4..431b3211 100644
--- a/dist/api/Status.js
+++ b/dist/api/Status.js
@@ -26,7 +26,7 @@ class Status extends _DataCollector.DataCollector {
     return Status.find({}, { timestamp: -1 }, 1).
     then(res => {
       res = res.data[0];
-      delete res._id;
+      if (res) delete res._id;
       return res;
     });
   }
@@ -57,7 +57,7 @@ class Status extends _DataCollector.DataCollector {
       this.getHighestBlock(),
       this.getTotalBlocks()]);
 
-      const status = Object.assign(blocksStatus, {
+      const status = Object.assign(blocksStatus || {}, {
         dbLastBlockReceived: last.number,
         dbLastBlockReceivedTime: last._received,
         dbHighBlock: high.number,
diff --git a/dist/api/UserEventsApi.js b/dist/api/UserEventsApi.js
index 54c1a2dd..a39519d7 100644
--- a/dist/api/UserEventsApi.js
+++ b/dist/api/UserEventsApi.js
@@ -20,6 +20,7 @@ const UserEventsApi = (io, api, { log }) => {
       let result = res.data;
       let req = payload;
       let error = res.error;
+      if (!msg.socketId) return;
       const socket = io.sockets.connected[msg.socketId];
       log.trace(`Sending message to client ${module}.${action} error:${JSON.stringify(error)}`);
       if (socket) socket.emit('data', (0, _apiTools.formatRes)({ module, action, result, req, error }));
diff --git a/dist/api/docs.yaml b/dist/api/docs.yaml
index 02cbd443..29534c65 100644
--- a/dist/api/docs.yaml
+++ b/dist/api/docs.yaml
@@ -79,6 +79,8 @@ definitions:
 
   Response:
     type: object
+    description: Response
+    name: Item
     properties:
       pages:
         type: object
@@ -90,6 +92,7 @@ definitions:
             description: sortable fields
             type: object
           defaultSort:
+            type: object
           sortDir:
             type: boolean
           limit:
@@ -106,6 +109,7 @@ definitions:
           type: object
 
   ResponseList:
+    description: ResponseList
     type: object
     properties:
       pages:
@@ -118,6 +122,7 @@ definitions:
             description: sortable fields
             type: object
           defaultSort:
+            type: object
           sortDir:
             type: boolean
           limit:
diff --git a/dist/api/index.js b/dist/api/index.js
index fffe174b..1f42bb53 100644
--- a/dist/api/index.js
+++ b/dist/api/index.js
@@ -25,13 +25,43 @@ const address = _config.default.api.address || 'localhost';
   status.start();
   txPool.start();
 
+  let userEvents;
+
+  const delayedResult = (res, payload, socket) => {
+    const { params, result, delayed } = res;
+    if (delayed && userEvents) {
+      const registry = delayed.registry || !result.data && delayed.runIfEmpty;
+      if (payload.getDelayed) {
+        const lastBlock = api.getLastBlock();
+        const block = lastBlock ? lastBlock.number : null;
+
+        userEvents.send({
+          action: delayed.action,
+          module: delayed.module,
+          params,
+          socketId: socket ? socket.id : undefined,
+          payload,
+          block,
+          result });
+
+      }
+      res.result.delayed = { fields: delayed.fields, registry };
+    }
+    return res;
+  };
+
+  const send = ({ res, response, payload }) => {
+    const { result } = delayedResult(response, payload);
+    res.send(result);
+  };
+
   // http server
-  const httpServer = (0, _HttpServer.HttpServer)({ api, status, log: _log.default });
+  const { httpServer } = (0, _HttpServer.HttpServer)({ api, status, log: _log.default }, send);
   httpServer.listen(port, address);
   const io = new _socket.default(httpServer);
 
   // start userEvents api
-  const userEvents = (0, _UserEventsApi.default)(io, api, { log: _log.default });
+  userEvents = (0, _UserEventsApi.default)(io, api, { log: _log.default });
 
   io.httpServer.on('listening', () => {
     _log.default.info(`Server listening on: ${address || '0.0.0.0'}:${port}`);
@@ -127,25 +157,9 @@ const address = _config.default.api.address || 'localhost';
     socket.on('data', async payload => {
       try {
         const res = await api.run(payload);
-        const { module, action, params, result, delayed } = res;
-        if (delayed && userEvents) {
-          const registry = delayed.registry || !result.data && delayed.runIfEmpty;
-          if (payload.getDelayed) {
-            const lastBlock = api.getLastBlock();
-            const block = lastBlock ? lastBlock.number : null;
-            userEvents.send({
-              action: delayed.action,
-              module: delayed.module,
-              params,
-              socketId: socket.id,
-              payload,
-              block,
-              result });
-
-          }
-          result.delayed = { fields: delayed.fields, registry };
-        }
-        socket.emit('data', (0, _apiTools.formatRes)({ module, action, result, req: payload }));
+        const req = payload;
+        const { module, action, result } = delayedResult(res, payload, socket);
+        socket.emit('data', (0, _apiTools.formatRes)({ module, action, result, req }));
       } catch (err) {
         _log.default.debug(`Action: ${payload.action}: ERROR: ${err}`);
         _log.default.trace(err);
diff --git a/dist/api/modules/ContractVerification.js b/dist/api/modules/ContractVerification.js
index b9c461e6..45f24fcd 100644
--- a/dist/api/modules/ContractVerification.js
+++ b/dist/api/modules/ContractVerification.js
@@ -2,8 +2,8 @@
 var _StoredConfig = require("../../lib/StoredConfig");
 var _ContractVerifierModule = require("../../services/userEvents/ContractVerifierModule");
 var _Errors = require("../lib/Errors");
-var _mongodb = require("mongodb");
-var _types = require("../../lib/types");
+
+var _types = require("../../lib/types"); // import { ObjectID } from 'mongodb'
 
 class ContractVerification extends _DataCollector.DataCollectorItem {
   constructor(collections, name) {
@@ -58,12 +58,14 @@ class ContractVerification extends _DataCollector.DataCollectorItem {
 
           // TODO Check if has pending verifications
 
-          const { creationCode, code } = data;
+          // const { creationCode, code } = data
+          const { creationCode } = data;
           if (!creationCode) throw new _Errors.Error404('Contract creation data not found');
 
           // Contract verifier payload
           request.bytecode = creationCode;
-          request.deployedBytecode = code;
+          // request.deployedBytecode = code
+          request._id = (0, _ContractVerifierModule.getVerificationId)(request);
           return { data: request };
         } catch (err) {
           return Promise.reject(err);
@@ -130,8 +132,7 @@ class ContractVerification extends _DataCollector.DataCollectorItem {
         try {
           let { id } = params;
           if (!id) throw new Error('Invalid id');
-          const _id = (0, _mongodb.ObjectID)(id);
-          const verification = await this.getOne({ _id });
+          const verification = await this.getOne({ _id: id });
           if (verification && verification.data) {
             const { result, match } = verification.data;
             return { data: { result, match } };
diff --git a/dist/api/modules/VerificationResults.js b/dist/api/modules/VerificationResults.js
index 672ac111..c1c6d0e3 100644
--- a/dist/api/modules/VerificationResults.js
+++ b/dist/api/modules/VerificationResults.js
@@ -45,9 +45,9 @@ class VerificationResults extends _DataCollector.DataCollectorItem {
        *          $ref: '#/responses/NotFound'
        */
       getVerification: async params => {
-        const { address } = params;
+        const { address, fields } = params;
         const query = { address, match: true };
-        return this.getItem(query, params);
+        return this.getOne(query, fields);
       } };
 
   }}exports.VerificationResults = VerificationResults;var _default =
diff --git a/dist/api/routes/api.js b/dist/api/routes/api.js
index 3b46e901..7376a470 100644
--- a/dist/api/routes/api.js
+++ b/dist/api/routes/api.js
@@ -2,28 +2,30 @@
 var _bodyParser = _interopRequireDefault(require("body-parser"));function _interopRequireDefault(obj) {return obj && obj.__esModule ? obj : { default: obj };}
 const router = _express.default.Router();
 
-const Routes = ({ log, api }) => {
-  const getResult = async (api, { module, action, params }) => {
+const Routes = ({ log, api }, send) => {
+  const getResult = async ({ module, action, params }) => {
     try {
-      const { result } = await api.run({ module, action, params });
-      if (!result) throw new Error('Missing result');
-      if (!result.data) throw new Error('Missing data');
-      return result;
+      const response = await api.run({ module, action, params });
+      if (!response.result) throw new Error('Missing result');
+      // if (!result.data) throw new Error('Missing data')
+      return response;
     } catch (err) {
+      log.debug({ module, action, params });
       return Promise.reject(err);
     }
   };
-  const sendResult = async (api, res, { module, action, params }) => {
-    let result;
+  const sendResult = async ({ res, req, next }, payload) => {
+    const { module, action } = payload;
+    let response;
     try {
       if (!!module !== !!action) {
         res.status(400).send();
         return;
       }
-      if (!module && !action) result = api.info();else
-      result = await getResult(api, { module, action, params });
-      if (!result) throw new Error('Empty result');
-      res.send(result);
+      if (!module && !action) response = { result: api.info() };else
+      response = await getResult(payload);
+      if (typeof send === 'function') send({ response, res, req, next, payload });else
+      res.send(response.result);
     } catch (err) {
       res.status(404).send();
       log.error(err);
@@ -35,11 +37,11 @@ const Routes = ({ log, api }) => {
     const { module, action } = params;
     delete params.module;
     delete params.action;
-    return sendResult(api, res, { module, action, params });
+    return sendResult({ res, req, next }, { module, action, params });
   });
 
-  router.post('/', _bodyParser.default.json(), (req, res, next) => {
-    return sendResult(api, res, req.body);
+  router.post('/', _bodyParser.default.json({ limit: '5mb' }), (req, res, next) => {
+    return sendResult({ res, req, next }, req.body);
   });
 
   return router;
diff --git a/dist/lib/collections.js b/dist/lib/collections.js
index b7dcad4b..18f7d3d8 100644
--- a/dist/lib/collections.js
+++ b/dist/lib/collections.js
@@ -257,7 +257,11 @@
 
     {
       key: { match: 1 },
-      name: 'verificationsResultsMatchIndex' }] },
+      name: 'verificationsResultsMatchIndex' },
+
+    {
+      key: { address: 1, match: 1 },
+      name: 'verificationResultAddressMatchIndex' }] },
 
 
 
diff --git a/dist/services/userEvents/ContractVerifierModule.js b/dist/services/userEvents/ContractVerifierModule.js
index 5224fbd6..70f4dcbf 100644
--- a/dist/services/userEvents/ContractVerifierModule.js
+++ b/dist/services/userEvents/ContractVerifierModule.js
@@ -1,6 +1,6 @@
-"use strict";Object.defineProperty(exports, "__esModule", { value: true });exports.ContractVerifierModule = ContractVerifierModule;exports.replaceImport = replaceImport;exports.extractUsedSourcesFromRequest = extractUsedSourcesFromRequest;exports.default = exports.versionsId = void 0;var _socket = _interopRequireDefault(require("socket.io-client"));
+"use strict";Object.defineProperty(exports, "__esModule", { value: true });exports.ContractVerifierModule = ContractVerifierModule;exports.replaceImport = replaceImport;exports.extractUsedSourcesFromRequest = extractUsedSourcesFromRequest;exports.getVerificationId = getVerificationId;exports.default = exports.versionsId = void 0;var _socket = _interopRequireDefault(require("socket.io-client"));
 var _StoredConfig = require("../../lib/StoredConfig");
-var _mongodb = require("mongodb");function _interopRequireDefault(obj) {return obj && obj.__esModule ? obj : { default: obj };}
+var _rskUtils = require("@rsksmart/rsk-utils");function _interopRequireDefault(obj) {return obj && obj.__esModule ? obj : { default: obj };}
 
 // id to store solc versions list on Config collection
 const versionsId = '_contractVerifierVersions';exports.versionsId = versionsId;
@@ -41,7 +41,7 @@ function ContractVerifierModule(db, collections, { url } = {}, { log } = {}) {
           const result = data ? data.result : null;
           let { _id, address } = request;
           if (!_id) throw new Error(`Missing _id {$request}`);
-          _id = (0, _mongodb.ObjectID)(_id);
+          // _id = ObjectID(_id)
           log.debug(`New verification received ${address}`);
           // Update verification
           const match = checkResult(result || {});
@@ -81,11 +81,12 @@ function ContractVerifierModule(db, collections, { url } = {}, { log } = {}) {
       const { data } = result;
       const { module, action } = payload;
       const { address } = data;
-      delete data._id;
+      // delete data._id
+      const { _id } = data;
       if (!address) throw new Error(`Missing address in verification`);
-      let res = await collection.insertOne({ address, request: data, timestamp: Date.now() });
+      let res = await collection.insertOne({ _id, address, request: data, timestamp: Date.now() });
       const id = res.insertedId;
-      if (!id) throw new Error(`Error creating pending verification`);
+      if (!id || id !== _id) throw new Error(`Error creating pending verification`);
       data._id = id;
       log.debug(`Sending verification to verifier ID:${id}`);
       if (!socket.connected) throw new Error('Cannot connect to contract verifier');
@@ -140,6 +141,12 @@ function extractUsedSourcesFromRequest({ source, imports }, { usedSources }) {
     const { contents } = imp;
     return { name, contents };
   });
+}
+
+function getVerificationId({ address }) {
+  if (!(0, _rskUtils.isAddress)(address)) throw new Error(`Invalid address ${address}`);
+  const timestamp = Date.now();
+  return (0, _rskUtils.add0x)((0, _rskUtils.keccak256)(`${address}${timestamp}`));
 }var _default =
 
 ContractVerifierModule;exports.default = _default;
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 719527d0..03b2ad5f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "rsk-explorer-api",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 4da67ffd..3ec3675b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rsk-explorer-api",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "description": "",
   "main": "index.js",
   "scripts": {
diff --git a/public/swagger.json b/public/swagger.json
index 87971e4c..57030fb0 100644
--- a/public/swagger.json
+++ b/public/swagger.json
@@ -1,7 +1,7 @@
 {
   "info": {
     "title": "rsk-explorer-api",
-    "version": "1.2.0",
+    "version": "1.2.1",
     "description": "explorer API Documentation"
   },
   "swagger": "2.0",
@@ -1928,6 +1928,8 @@
     },
     "Response": {
       "type": "object",
+      "description": "Response",
+      "name": "Item",
       "properties": {
         "pages": {
           "type": "object",
@@ -1940,7 +1942,9 @@
               "description": "sortable fields",
               "type": "object"
             },
-            "defaultSort": null,
+            "defaultSort": {
+              "type": "object"
+            },
             "sortDir": {
               "type": "boolean"
             },
@@ -1967,6 +1971,7 @@
       }
     },
     "ResponseList": {
+      "description": "ResponseList",
       "type": "object",
       "properties": {
         "pages": {
@@ -1980,7 +1985,9 @@
               "description": "sortable fields",
               "type": "object"
             },
-            "defaultSort": null,
+            "defaultSort": {
+              "type": "object"
+            },
             "sortDir": {
               "type": "boolean"
             },