diff --git a/index.js b/index.js
index 6a845c3..4434e08 100755
--- a/index.js
+++ b/index.js
@@ -13,7 +13,7 @@ const repl = require("repl")
 const SLP = require("./lib/SLP")
 const clone = require("git-clone")
 
-program.version("4.0.0", "-v, --version")
+program.version("4.2.0", "-v, --version")
 
 program
   .command("new <name>")
diff --git a/lib/ECPair.js b/lib/ECPair.js
new file mode 100644
index 0000000..8530b97
--- /dev/null
+++ b/lib/ECPair.js
@@ -0,0 +1,37 @@
+"use strict";
+var __extends = (this && this.__extends) || (function () {
+    var extendStatics = function (d, b) {
+        extendStatics = Object.setPrototypeOf ||
+            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+        return extendStatics(d, b);
+    };
+    return function (d, b) {
+        extendStatics(d, b);
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+    };
+})();
+Object.defineProperty(exports, "__esModule", { value: true });
+// require deps
+var BITBOXECPair = require("bitbox-sdk/lib/ECPair").default;
+var BITBOXSDK = require("bitbox-sdk");
+var BITBOX = new BITBOXSDK();
+var utils = require("slpjs").Utils;
+var ECPair = /** @class */ (function (_super) {
+    __extends(ECPair, _super);
+    function ECPair() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    ECPair.toSLPAddress = function (ecpair) {
+        try {
+            var slpAddress = utils.toSlpAddress(BITBOX.ECPair.toCashAddress(ecpair));
+            return slpAddress;
+        }
+        catch (err) {
+            return err;
+        }
+    };
+    return ECPair;
+}(BITBOXECPair));
+exports.default = ECPair;
diff --git a/lib/SLP.js b/lib/SLP.js
index 9942f1e..fef0e4a 100644
--- a/lib/SLP.js
+++ b/lib/SLP.js
@@ -16,6 +16,7 @@ var __extends = (this && this.__extends) || (function () {
 var BITBOXSDK = require("bitbox-sdk");
 // import classes
 var Address_1 = require("./Address");
+var ECPair_1 = require("./ECPair");
 var HDNode_1 = require("./HDNode");
 var TokenType1_1 = require("./TokenType1");
 var Utils_1 = require("./Utils");
@@ -31,6 +32,7 @@ var SLP = /** @class */ (function (_super) {
         else
             restURL = "https://rest.bitcoin.com/v2/";
         _this.Address = new Address_1.default(restURL);
+        _this.ECPair = ECPair_1.default;
         _this.HDNode = new HDNode_1.default(restURL);
         _this.TokenType1 = new TokenType1_1.default(restURL);
         _this.Utils = new Utils_1.default(restURL);
diff --git a/package-lock.json b/package-lock.json
index 1fbf5a4..d2fc157 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "slp-sdk",
-  "version": "4.1.0",
+  "version": "4.2.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 081ea52..c556acb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "slp-sdk",
-  "version": "4.1.0",
+  "version": "4.2.0",
   "description": "SLP SDK powered by BITBOX",
   "main": "lib/SLP",
   "scripts": {
diff --git a/src/ECPair.ts b/src/ECPair.ts
new file mode 100644
index 0000000..1a50f09
--- /dev/null
+++ b/src/ECPair.ts
@@ -0,0 +1,20 @@
+// require deps
+const BITBOXECPair = require("bitbox-sdk/lib/ECPair").default
+const BITBOXSDK = require("bitbox-sdk")
+const BITBOX = new BITBOXSDK()
+const utils = require("slpjs").Utils
+
+class ECPair extends BITBOXECPair {
+  static toSLPAddress(ecpair: any): string {
+    try {
+      const slpAddress: string = utils.toSlpAddress(
+        BITBOX.ECPair.toCashAddress(ecpair)
+      )
+      return slpAddress
+    } catch (err) {
+      return err
+    }
+  }
+}
+
+export default ECPair
diff --git a/src/SLP.ts b/src/SLP.ts
index 61dc67a..368ef3d 100644
--- a/src/SLP.ts
+++ b/src/SLP.ts
@@ -6,6 +6,7 @@ import { IConfig } from "./interfaces/SLPInterfaces"
 
 // import classes
 import Address from "./Address"
+import ECPair from "./ECPair"
 import HDNode from "./HDNode"
 import TokenType1 from "./TokenType1"
 import Utils from "./Utils"
@@ -24,6 +25,7 @@ class SLP extends BITBOXSDK {
     else restURL = "https://rest.bitcoin.com/v2/"
 
     this.Address = new Address(restURL)
+    this.ECPair = ECPair
     this.HDNode = new HDNode(restURL)
     this.TokenType1 = new TokenType1(restURL)
     this.Utils = new Utils(restURL)
diff --git a/test/Address.js b/test/Address.js
index 6f25273..b1a5064 100644
--- a/test/Address.js
+++ b/test/Address.js
@@ -1,4 +1,3 @@
-"use strict"
 const assert = require("assert")
 const slp = require("./../lib/SLP")
 const SLP = new slp({
diff --git a/test/ECPair.js b/test/ECPair.js
new file mode 100644
index 0000000..cb3e9bc
--- /dev/null
+++ b/test/ECPair.js
@@ -0,0 +1,21 @@
+const fixtures = require("./fixtures/ECPair.json")
+const assert = require("assert")
+const assert2 = require("chai").assert
+const slp = require("./../lib/SLP")
+const SLP = new slp()
+
+// Used for debugging and iterrogating JS objects.
+const util = require("util")
+util.inspect.defaultOptions = { depth: 1 }
+
+describe("#ECPair", () => {
+  describe("#toSLPAddress", () => {
+    it(`should return slp address for ecpair`, async () => {
+      fixtures.wif.forEach((wif, index) => {
+        const ecpair = SLP.ECPair.fromWIF(wif)
+        const slpAddr = SLP.ECPair.toSLPAddress(ecpair)
+        assert.equal(slpAddr, fixtures.address[index])
+      })
+    })
+  })
+})
diff --git a/test/fixtures/ECPair.json b/test/fixtures/ECPair.json
new file mode 100644
index 0000000..d4c9f52
--- /dev/null
+++ b/test/fixtures/ECPair.json
@@ -0,0 +1,10 @@
+{
+  "wif": [
+    "cUCSrdhu7mCzx4sWqL6irqzprkofxPmLHYgkSnG2WaWVqJDXtWRS",
+    "cNVP2nTzUMFerfpjrTuDgoFGnKAfjZznKomknUVKQSdFHqK5cRc5"
+  ],
+  "address": [
+    "slptest:qq835u5srlcqwrtwt6xm4efwan30fxg9hcqag6fk03",
+    "slptest:qrj9k49drcsk4al8wxn53hnkfvts6ew5jvv32952nh"
+  ]
+}