diff --git a/README.md b/README.md
index c2410c7..55eebc5 100644
--- a/README.md
+++ b/README.md
@@ -50,9 +50,11 @@ molecules/
 └── icp/
 ├── └── icp-auth
 └── ton/
-├── └── ton-auth
+├── └── ton-auth/
+└── massa/
+    └── massa-auth
 └── near/
-    └── n-view-state
+└── └── n-view-state
 └── ark/
 ├── ├── resolve
 ├── └── state
@@ -73,6 +75,7 @@ molecules/
 | TRON (`trx`) | `trx.molecule.sh` | `trx-auth` | 🟩 |
 | Internet Protocol (`ICP`) | `icp.molecule.sh` | `icp-auth` |  🟩 |
 | TON (`ton`) | `ton.molecule.sh` | `ton-auth` |  🟩 |
+| Massa (`massa`) | `massa.molecule.sh` | `massa-auth` |  🟩 |
 | NEAR (`near`) | `near.molecule.sh` | `n-view-state` | 🟩 |
 | Ark Protocol (`ark`) | `ark.molecule.sh` | `state` `resolve` `soark/domain` | 🟩/🟨 
 | Randomization (`rand`) | `rand.molecule.sh` | `generate` | 🟩/🟨 |
@@ -109,6 +112,8 @@ The following EXM contracts integrate [molecule.sh](http://molecule.sh) atoms to
 
 - TON authentication: Simple name registry contract. [example](./examples/ton-signing/wtf.md)
 
+- Massa authentication: Simple name registry contract. [example](./examples/massa-signing/wtf.md)
+
 - Getting [Ark Protocol](https://ark.decent.land) identity object. [example](./examples/ark-resolving/wtf.md)
 
 - GPT3 integration in a smart contract. [example](./examples/gpt3/wtf.md) 
diff --git a/examples/massa-signing/contract.js b/examples/massa-signing/contract.js
new file mode 100644
index 0000000..6e8fe95
--- /dev/null
+++ b/examples/massa-signing/contract.js
@@ -0,0 +1,42 @@
+export async function handle(state, action) {
+  const input = action.input;
+
+  const names = state.names;
+  const signatures = state.signatures;
+  const verification_message = state.verification_message;
+  const massa_molecule_endpoint = state.massa_molecule_endpoint;
+
+  if (input.function === "register") {
+    const name = input.name;
+    const caller = input.caller;
+    const signature = input.signature;
+
+    ContractAssert(name.trim().length, "error invalid name");
+    ContractAssert(!(name in names), "name already registered");
+    ContractAssert(caller && signature, "missing required arguments");
+    ContractAssert(
+      !signatures.includes(signature),
+      "error signed message used"
+    );
+
+    const message = btoa(verification_message);
+    const res = await _moleculeSignatureVerification(caller, message, signature);
+    state.names[res.address] = `${name.trim()}.massa`;
+    signatures.push(signature);
+
+    return { state };
+  }
+
+  async function _moleculeSignatureVerification(caller, message, signature) {
+    try {
+      const isValid = await EXM.deterministicFetch(
+        `${massa_molecule_endpoint}/massa-auth/${caller}/${message}/${signature}`
+      );
+      ContractAssert(isValid.asJSON()?.result, "unauthorized caller");
+      return isValid.asJSON();
+    } catch (error) {
+      throw new ContractError("molecule res error");
+    }
+  }
+}
+
diff --git a/examples/massa-signing/contract.json b/examples/massa-signing/contract.json
new file mode 100644
index 0000000..45e297f
--- /dev/null
+++ b/examples/massa-signing/contract.json
@@ -0,0 +1,7 @@
+{
+	"names": {},
+	"signatures": [],
+	"verification_message": "hello world",
+	"massa_molecule_endpoint": "http://massa.molecule.sh"
+}
+
diff --git a/examples/massa-signing/wtf.md b/examples/massa-signing/wtf.md
new file mode 100644
index 0000000..4ec7fc9
--- /dev/null
+++ b/examples/massa-signing/wtf.md
@@ -0,0 +1,25 @@
+## About
+The EXM contract below is an example implementation of a contract that uses [Massa.net](https://massa.net) for contract's caller authentication (`action.caller`), empowered by `massa-auth` atom of `massa` molecule.
+
+#### Contract
+- Live deployment: [EDzDQDgaStQEGmuDH9X1DxQGY5o7F11Jyj4AYSFL9MI](https://api.exm.dev/read/EDzDQDgaStQEGmuDH9X1DxQGY5o7F11Jyj4AYSFL9MI)
+- source code: [./contract.js](./contract.js)
+
+## Prerequisites
+
+- EXM SDK
+```console
+npm i -g @execution-machine/sdk
+```
+
+- EXM API token ID: visit [exm.dev](https://exm.dev)
+
+## Iteracting with the contract
+To register a `name` in the contract example, you have first to sign with your wallet the message used for verification in the contract's example which is `hello world` 
+
+`signature` and caller (`publicKey`) should be both passed under base58 encoding format.
+
+#### EXM CLI
+```console
+exm function:write EDzDQDgaStQEGmuDH9X1DxQGY5o7F11Jyj4AYSFL9MI --input '{"function": "register", "name": "buildooor", "signature": "$MASSA_SIGNATURE", "caller": "$MASSA_PUBLIC_KEY"}' --token EXM_TOKEN_ID
+```
diff --git a/examples/ton-signing/wtf.md b/examples/ton-signing/wtf.md
index 516950f..95dfe76 100644
--- a/examples/ton-signing/wtf.md
+++ b/examples/ton-signing/wtf.md
@@ -1,5 +1,5 @@
 ## About
-The EXM contract below is an example implementation of a contract that uses TON network [ICP](https://ton.org) for contract's caller authentication (`action.caller`), empowered by `ton-auth` atom of `ton` molecule.
+The EXM contract below is an example implementation of a contract that uses TON network for contract's caller authentication (`action.caller`), empowered by `ton-auth` atom of `ton` molecule.
 
 #### Contract
 - Live deployment: [lpLm1AKAhY-AZPMFwXVOLkMe7UDtaoNiG3keNMJEapg](https://api.exm.dev/read/lpLm1AKAhY-AZPMFwXVOLkMe7UDtaoNiG3keNMJEapg)
diff --git a/package.json b/package.json
index ca3ea60..eace64a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "molecule",
-  "version": "0.1.5",
+  "version": "0.1.6",
   "type": "module",
   "description": "reusable EXM components and helper functions for a faster development",
   "main": "./src/api.js",
diff --git a/src/api.js b/src/api.js
index 824c2a4..3df8464 100644
--- a/src/api.js
+++ b/src/api.js
@@ -18,6 +18,7 @@ import { isSubstrateSigner } from "./molecules/substrate/atoms/verifySigner.js";
 import { isTrxSigner } from "./molecules/trx/atoms/verifySigner.js";
 import { isIcpSigner } from "./molecules/icp/atoms/verifySigner.js";
 import { isTonSigner } from "./molecules/ton/atoms/verifySigner.js";
+import { isMassaSigner } from "./molecules/massa/atoms/verifySigner.js";
 import { readNearOracleState } from "./molecules/near/atoms/read-contract.js";
 import base64url from "base64url";
 
@@ -180,6 +181,22 @@ app.get("/ton-auth/:pubkey/:message/:signature", async (req, res) => {
   }
 });
 
+app.get("/massa-auth/:pubkey/:message/:signature", async (req, res) => {
+  try {
+    res.setHeader("Content-Type", "application/json");
+
+    assert.equal(checkSubdomain(req, "massa"), true);
+    const { pubkey, message, signature } = req.params;
+    const response = await isMassaSigner(message, pubkey, signature);
+    res.send(response);
+    return;
+  } catch (error) {
+    console.log(error)
+    res.send({ result: false, address: null });
+    return;
+  }
+});
+
 app.get("/n-view-state/:network/:address", async (req, res) => {
   try {
     res.setHeader("Content-Type", "application/json");
diff --git a/src/molecules/massa/atoms/verifySigner.js b/src/molecules/massa/atoms/verifySigner.js
new file mode 100644
index 0000000..ad123cb
--- /dev/null
+++ b/src/molecules/massa/atoms/verifySigner.js
@@ -0,0 +1,14 @@
+import { MOLECULE_API_ENDPOINT } from "../../../utils/constants.js"
+import axios from "axios";
+
+export async function isMassaSigner(message, pubkey, signature) {
+  try {
+    const result = await axios.get(
+      `${MOLECULE_API_ENDPOINT}/massa/${pubkey}/${message}/${signature}`
+    );
+
+    return result?.data;;
+  } catch (error) {
+    return { result: false, address: null };
+  }
+}
diff --git a/src/molecules/ton/atoms/verifySigner.js b/src/molecules/ton/atoms/verifySigner.js
index 258009c..c7c1bfd 100644
--- a/src/molecules/ton/atoms/verifySigner.js
+++ b/src/molecules/ton/atoms/verifySigner.js
@@ -1,10 +1,10 @@
-import { TONWEB_ENDPOINT } from "../utils/constants.js";
+import { MOLECULE_API_ENDPOINT } from "../../../utils/constants.js";
 import axios from "axios";
 
 export async function isTonSigner(message, pubkey, signature) {
   try {
     const result = await axios.get(
-      `${TONWEB_ENDPOINT}/${pubkey}/${message}/${signature}`
+      `${MOLECULE_API_ENDPOINT}/tonweb/${pubkey}/${message}/${signature}`
     );
 
     return result?.data;;
diff --git a/src/molecules/ton/utils/constants.js b/src/molecules/ton/utils/constants.js
deleted file mode 100644
index 930c74c..0000000
--- a/src/molecules/ton/utils/constants.js
+++ /dev/null
@@ -1 +0,0 @@
-export const TONWEB_ENDPOINT = `https://tonweb-wrapper.herokuapp.com/tonweb`;
\ No newline at end of file
diff --git a/src/utils/constants.js b/src/utils/constants.js
index 1cf538b..465f3d6 100644
--- a/src/utils/constants.js
+++ b/src/utils/constants.js
@@ -10,6 +10,9 @@ export const MOLECULES = [
   "icp",
   "ton",
   "near",
+  "massa",
   "substrate",
   "rand",
 ];
+
+export const MOLECULE_API_ENDPOINT = `https://molecule-apis-wrapper.herokuapp.com`;