diff --git a/package-lock.json b/package-lock.json
index bff848cb..51ebf965 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "fluence",
-  "version": "0.7.9",
+  "version": "0.7.24",
   "lockfileVersion": 1,
   "requires": true,
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@@ -185,6 +185,17 @@
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       }
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+    "@wasm-tool/wasm-pack-plugin": {
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+      "resolved": "https://registry.npmjs.org/@wasm-tool/wasm-pack-plugin/-/wasm-pack-plugin-1.0.1.tgz",
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+      "dev": true,
+      "requires": {
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+        "command-exists": "^1.2.7",
+        "watchpack": "^1.6.0"
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@@ -836,6 +847,12 @@
         "multicast-dns-service-types": "^1.1.0"
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+      "resolved": "https://registry.npmjs.org/boolbase/-/boolbase-1.0.0.tgz",
+      "integrity": "sha1-aN/1++YMUes3cl6p4+0xDcwed24=",
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       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -1045,6 +1062,16 @@
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+      "resolved": "https://registry.npmjs.org/camel-case/-/camel-case-3.0.0.tgz",
+      "integrity": "sha1-yjw2iKTpzzpM2nd9xNy8cTJJz3M=",
+      "dev": true,
+      "requires": {
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+        "upper-case": "^1.1.1"
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       "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
@@ -1183,6 +1210,15 @@
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+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.2.3.tgz",
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+      "dev": true,
+      "requires": {
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@@ -1234,6 +1270,12 @@
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     },
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+      "resolved": "https://registry.npmjs.org/command-exists/-/command-exists-1.2.9.tgz",
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+    },
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       "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
@@ -1504,6 +1546,24 @@
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+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/css-select/-/css-select-1.2.0.tgz",
+      "integrity": "sha1-KzoRBTnFNV8c2NMUYj6HCxIeyFg=",
+      "dev": true,
+      "requires": {
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+        "css-what": "2.1",
+        "domutils": "1.5.1",
+        "nth-check": "~1.0.1"
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+    "css-what": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/css-what/-/css-what-2.1.3.tgz",
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+      "dev": true
+    },
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@@ -1725,12 +1785,64 @@
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+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/dom-converter/-/dom-converter-0.2.0.tgz",
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+      "dev": true,
+      "requires": {
+        "utila": "~0.4"
+      }
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+    "dom-serializer": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-0.2.2.tgz",
+      "integrity": "sha512-2/xPb3ORsQ42nHYiSunXkDjPLBaEj/xTwUO4B7XCZQTRk7EBtTOPaygh10YAAh2OI1Qrp6NWfpAhzswj0ydt9g==",
+      "dev": true,
+      "requires": {
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+        "entities": "^2.0.0"
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+          "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-2.0.2.tgz",
+          "integrity": "sha512-wFwTwCVebUrMgGeAwRL/NhZtHAUyT9n9yg4IMDwf10+6iCMxSkVq9MGCVEH+QZWo1nNidy8kNvwmv4zWHDTqvA==",
+          "dev": true
+        }
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       "dev": true
     },
+    "domelementtype": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-1.3.1.tgz",
+      "integrity": "sha512-BSKB+TSpMpFI/HOxCNr1O8aMOTZ8hT3pM3GQ0w/mWRmkhEDSFJkkyzz4XQsBV44BChwGkrDfMyjVD0eA2aFV3w==",
+      "dev": true
+    },
+    "domhandler": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-2.4.2.tgz",
+      "integrity": "sha512-JiK04h0Ht5u/80fdLMCEmV4zkNh2BcoMFBmZ/91WtYZ8qVXSKjiw7fXMgFPnHcSZgOo3XdinHvmnDUeMf5R4wA==",
+      "dev": true,
+      "requires": {
+        "domelementtype": "1"
+      }
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+    "domutils": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/domutils/-/domutils-1.5.1.tgz",
+      "integrity": "sha1-3NhIiib1Y9YQeeSMn3t+Mjc2gs8=",
+      "dev": true,
+      "requires": {
+        "dom-serializer": "0",
+        "domelementtype": "1"
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+    },
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@@ -1833,6 +1945,12 @@
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+      "resolved": "https://registry.npmjs.org/entities/-/entities-2.0.3.tgz",
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@@ -2951,6 +3069,98 @@
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     },
+    "html-minifier": {
+      "version": "3.5.21",
+      "resolved": "https://registry.npmjs.org/html-minifier/-/html-minifier-3.5.21.tgz",
+      "integrity": "sha512-LKUKwuJDhxNa3uf/LPR/KVjm/l3rBqtYeCOAekvG8F1vItxMUpueGd94i/asDDr8/1u7InxzFA5EeGjhhG5mMA==",
+      "dev": true,
+      "requires": {
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+        "clean-css": "4.2.x",
+        "commander": "2.17.x",
+        "he": "1.2.x",
+        "param-case": "2.1.x",
+        "relateurl": "0.2.x",
+        "uglify-js": "3.4.x"
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+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.17.1.tgz",
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+          "dev": true
+        }
+      }
+    },
+    "html-webpack-plugin": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/html-webpack-plugin/-/html-webpack-plugin-3.2.0.tgz",
+      "integrity": "sha1-sBq71yOsqqeze2r0SS69oD2d03s=",
+      "dev": true,
+      "requires": {
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+        "lodash": "^4.17.3",
+        "pretty-error": "^2.0.2",
+        "tapable": "^1.0.0",
+        "toposort": "^1.0.0",
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+          "dev": true
+        },
+        "emojis-list": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/emojis-list/-/emojis-list-2.1.0.tgz",
+          "integrity": "sha1-TapNnbAPmBmIDHn6RXrlsJof04k=",
+          "dev": true
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+        "json5": {
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+          "resolved": "https://registry.npmjs.org/json5/-/json5-0.5.1.tgz",
+          "integrity": "sha1-Hq3nrMASA0rYTiOWdn6tn6VJWCE=",
+          "dev": true
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+          "resolved": "https://registry.npmjs.org/loader-utils/-/loader-utils-0.2.17.tgz",
+          "integrity": "sha1-+G5jdNQyBabmxg6RlvF8Apm/s0g=",
+          "dev": true,
+          "requires": {
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+            "json5": "^0.5.0",
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+      "resolved": "https://registry.npmjs.org/htmlparser2/-/htmlparser2-3.10.1.tgz",
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+        "domhandler": "^2.3.0",
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+      "resolved": "https://registry.npmjs.org/lower-case/-/lower-case-1.1.4.tgz",
+      "integrity": "sha1-miyr0bno4K6ZOkv31YdcOcQujqw=",
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@@ -5060,6 +5276,15 @@
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@@ -5232,6 +5457,15 @@
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@@ -5566,6 +5800,15 @@
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+      "resolved": "https://registry.npmjs.org/pretty-error/-/pretty-error-2.1.1.tgz",
+      "integrity": "sha1-X0+HyPkeWuPzuoerTPXgOxoX8aM=",
+      "dev": true,
+      "requires": {
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@@ -5997,6 +6250,12 @@
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+        "dom-converter": "^0.2",
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@@ -6996,6 +7285,12 @@
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+      "resolved": "https://registry.npmjs.org/toposort/-/toposort-1.0.7.tgz",
+      "integrity": "sha1-LmhELZ9k7HILjMieZEOsbKqVACk=",
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     "uint8arrays": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/uint8arrays/-/uint8arrays-1.1.0.tgz",
@@ -7357,6 +7676,12 @@
       "integrity": "sha512-aZwGpamFO61g3OlfT7OQCHqhGnW43ieH9WZeP7QxN/G/jS4jfqUkZxoryvJgVPEcrl5NL/ggHsSmLMHuH64Lhg==",
       "dev": true
     },
+    "upper-case": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/upper-case/-/upper-case-1.1.3.tgz",
+      "integrity": "sha1-9rRQHC7EzdJrp4vnIilh3ndiFZg=",
+      "dev": true
+    },
     "uri-js": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
@@ -7437,6 +7762,22 @@
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
+    "util.promisify": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.0.tgz",
+      "integrity": "sha512-i+6qA2MPhvoKLuxnJNpXAGhg7HphQOSUq2LKMZD0m15EiskXUkMvKdF4Uui0WYeCUGea+o2cw/ZuwehtfsrNkA==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.2",
+        "object.getownpropertydescriptors": "^2.0.3"
+      }
+    },
+    "utila": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/utila/-/utila-0.4.0.tgz",
+      "integrity": "sha1-ihagXURWV6Oupe7MWxKk+lN5dyw=",
+      "dev": true
+    },
     "utils-merge": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
diff --git a/package.json b/package.json
index c54358b7..c36c8d3e 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
     "test-ts": "ts-mocha -p tsconfig.json src/**/*.spec.ts",
     "package:build": "NODE_ENV=production webpack && tsc",
     "compile": "tsc",
-    "start": "webpack-dev-server",
+    "start": "webpack-dev-server -p",
     "build": "webpack"
   },
   "author": "Fluence Labs",
@@ -45,6 +45,9 @@
     "typescript": "3.9.5",
     "webpack": "4.43.0",
     "webpack-cli": "3.3.11",
-    "webpack-dev-server": "3.11.0"
+    "webpack-dev-server": "3.11.0",
+    "@wasm-tool/wasm-pack-plugin": "1.0.1",
+    "html-webpack-plugin": "^3.2.0",
+    "text-encoding": "^0.7.0"
   }
 }
diff --git a/src/call_service.ts b/src/call_service.ts
new file mode 100644
index 00000000..1f28bf0b
--- /dev/null
+++ b/src/call_service.ts
@@ -0,0 +1,61 @@
+import {getService, registerService} from "./globalState";
+
+interface CallServiceResult {
+    ret_code: number,
+    result: string
+}
+
+export class Service {
+
+    serviceId: string;
+    functions: Map<string, (args: string) => string> = new Map();
+
+    constructor(serviceId: string) {
+        this.serviceId = serviceId;
+    }
+
+    registerFunction(fnName: string, fn: (args: string) => string) {
+        this.functions.set(fnName, fn);
+    }
+
+    call(fnName: string, args: string): CallServiceResult {
+        let fn = this.functions.get(fnName)
+        if (fn) {
+            try {
+                let result = fn(args)
+                return {
+                    ret_code: 0,
+                    result
+                }
+            } catch (err) {
+                return {
+                    ret_code: 1,
+                    result: JSON.stringify(err)
+                }
+            }
+
+        } else {
+            let errorMsg = `Error. There is no function ${fnName}`
+            return {
+                ret_code: 1,
+                result: errorMsg
+            }
+        }
+    }
+}
+
+let logger = new Service("logger")
+logger.registerFunction("logger", (args: string) => {
+    console.log("logger service: " + args)
+    return ""
+})
+registerService(logger);
+
+export function call_service(service_id: string, fn_name: string, args: string): string {
+    let service = getService(service_id)
+    if (service) {
+        return JSON.stringify(service.call(fn_name, args))
+    } else {
+        return `Error. There is no service ${service_id}`
+    }
+}
diff --git a/src/fluenceClient.ts b/src/fluenceClient.ts
index 91d4fc4f..69b2a59c 100644
--- a/src/fluenceClient.ts
+++ b/src/fluenceClient.ts
@@ -20,6 +20,9 @@ import * as PeerId from "peer-id";
 import Multiaddr from "multiaddr"
 import {FluenceConnection} from "./fluenceConnection";
 import {Subscriptions} from "./subscriptions";
+import * as stepper from "../stepper";
+
+const WASM = stepper.loadWasm();
 
 export class FluenceClient {
     readonly selfPeerId: PeerId;
@@ -61,7 +64,14 @@ export class FluenceClient {
 
         return (particle: Particle) => {
             // call all subscriptions for a new call
-            _this.subscriptions.applyToSubscriptions(particle);
+            if (!_this.subscriptions.applyToSubscriptions(particle)) {
+                // if there is no subscription, use Stepper
+                WASM.then((w) => {
+                    let stepperOutcomeStr = w.invoke(particle.init_peer_id, particle.script, JSON.stringify(particle.data))
+                    let stepperOutcome: StepperOutcome = JSON.parse(stepperOutcomeStr);
+                    console.log(stepperOutcome)
+                })
+            }
         }
     }
 
diff --git a/src/globalState.ts b/src/globalState.ts
new file mode 100644
index 00000000..4205cdb9
--- /dev/null
+++ b/src/globalState.ts
@@ -0,0 +1,12 @@
+import {Service} from "./call_service";
+
+// TODO put state with wasm file in each created FluenceClient
+let services: Map<string, Service> = new Map();
+
+export function registerService(service: Service) {
+    services.set(service.serviceId, service)
+}
+
+export function getService(serviceId: string): Service | undefined {
+    return services.get(serviceId)
+}
diff --git a/src/particle.ts b/src/particle.ts
index 0c4146d4..0e961d55 100644
--- a/src/particle.ts
+++ b/src/particle.ts
@@ -35,7 +35,9 @@ export async function build(peerId: PeerId, script: string, data: object, ttl?:
     let id = genUUID();
     let currentTime = (new Date()).getTime();
 
-    ttl = ttl ?? DEFAULT_TTL;
+    if (ttl) {
+        ttl = DEFAULT_TTL
+    }
 
     let particle: Particle = {
         id: id,
diff --git a/src/stepperOutcome.ts b/src/stepperOutcome.ts
new file mode 100644
index 00000000..3c8cde48
--- /dev/null
+++ b/src/stepperOutcome.ts
@@ -0,0 +1,5 @@
+interface StepperOutcome {
+    ret_code: number,
+    data: string,
+    next_peer_pks: string[]
+}
diff --git a/src/subscriptions.ts b/src/subscriptions.ts
index 431ddac6..f1802edd 100644
--- a/src/subscriptions.ts
+++ b/src/subscriptions.ts
@@ -41,11 +41,11 @@ export class Subscriptions {
      * A particle will be applied if id of the particle was subscribed earlier.
      * @param particle
      */
-    applyToSubscriptions(particle: Particle) {
-        // if subscription return true - delete it from subscriptions
+    applyToSubscriptions(particle: Particle): boolean {
         let callback = this.subscriptions.get(particle.id)
         if (callback) {
             callback(particle);
+            return true;
         } else {
             if (Number(particle.timestamp) + particle.ttl > Date.now()) {
                 console.log("Old particle received. 'ttl' is ended.");
@@ -53,6 +53,7 @@ export class Subscriptions {
                 console.log("External particle received. 'Stepper' needed on client. Unimplemented.");
             }
             console.log(particle);
+            return false;
         }
     }
 }
diff --git a/stepper.d.ts b/stepper.d.ts
new file mode 100644
index 00000000..81451045
--- /dev/null
+++ b/stepper.d.ts
@@ -0,0 +1 @@
+export function loadWasm(): Promise<typeof import('./pkg')>
diff --git a/stepper.js b/stepper.js
new file mode 100644
index 00000000..0f357f75
--- /dev/null
+++ b/stepper.js
@@ -0,0 +1,3 @@
+export async function loadWasm() {
+    return import('./pkg')
+}
diff --git a/tsconfig.json b/tsconfig.json
index 56a537cd..58cb1a42 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -13,7 +13,7 @@
     "allowSyntheticDefaultImports": true,
     "resolveJsonModule": true,
     "pretty": true,
-    "target": "es2018",
+    "target": "esnext",
     "module": "commonjs",
     "moduleResolution": "node",
     "declaration": true,
diff --git a/webpack.config.js b/webpack.config.js
index 2c58a228..d8606735 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -1,6 +1,7 @@
 const path = require('path');
 const webpack = require('webpack');
-const { CleanWebpackPlugin } = require('clean-webpack-plugin');
+const HtmlWebpackPlugin = require('html-webpack-plugin');
+const WasmPackPlugin = require("@wasm-tool/wasm-pack-plugin");
 
 const production = (process.env.NODE_ENV === 'production');
 
@@ -28,7 +29,16 @@ const config = {
         fs: 'empty'
     },
     plugins: [
-        new CleanWebpackPlugin(),
+        new HtmlWebpackPlugin(),
+        new WasmPackPlugin({
+            // TODO use another path somehow
+            crateDirectory: path.resolve(__dirname, "../../../aquamarine"),
+            outDir:path.resolve(__dirname, "./pkg")
+        }),
+        new webpack.ProvidePlugin({
+            TextDecoder: ['text-encoding', 'TextDecoder'],
+            TextEncoder: ['text-encoding', 'TextEncoder']
+        })
     ]
 };