diff --git a/packages/safe-chain/bin/safe-chain.js b/packages/safe-chain/bin/safe-chain.js
index 94e4e1f..922ee89 100755
--- a/packages/safe-chain/bin/safe-chain.js
+++ b/packages/safe-chain/bin/safe-chain.js
@@ -7,6 +7,7 @@ import { setup } from "../src/shell-integration/setup.js";
 import { teardown } from "../src/shell-integration/teardown.js";
 import { setupCi } from "../src/shell-integration/setup-ci.js";
 import { initializeCliArguments } from "../src/config/cliArguments.js";
+import { runProxy } from "../src/run-proxy.js";
 
 if (process.argv.length < 3) {
   ui.writeError("No command provided. Please provide a command to execute.");
@@ -21,15 +22,14 @@ const command = process.argv[2];
 
 if (command === "help" || command === "--help" || command === "-h") {
   writeHelp();
-  process.exit(0);
-}
-
-if (command === "setup") {
+} else if (command === "setup") {
   setup();
 } else if (command === "teardown") {
   teardown();
 } else if (command === "setup-ci") {
   setupCi();
+} else if (command === "run-proxy") {
+  await runProxy(process.argv.slice(2));
 } else if (command === "--version" || command === "-v" || command === "-v") {
   ui.writeInformation(`Current safe-chain version: ${getVersion()}`);
 } else {
diff --git a/packages/safe-chain/src/registryProxy/registryProxy.js b/packages/safe-chain/src/registryProxy/registryProxy.js
index 8169086..b5d6f5c 100644
--- a/packages/safe-chain/src/registryProxy/registryProxy.js
+++ b/packages/safe-chain/src/registryProxy/registryProxy.js
@@ -8,6 +8,15 @@ import chalk from "chalk";
 import { createInterceptorForUrl } from "./interceptors/createInterceptorForEcoSystem.js";
 import { getHasSuppressedVersions } from "./interceptors/npm/modifyNpmInfo.js";
 
+/**
+ * @typedef {Object} safeChainProxy
+ * @property {(port?: number) => Promise<void>} startServer
+ * @property {() => Promise<void>} stopServer
+ * @property {() => boolean} verifyNoMaliciousPackages
+ * @property {() => boolean} hasSuppressedVersions
+ * @property {() => number | null} getPort
+ */
+
 const SERVER_STOP_TIMEOUT_MS = 1000;
 /**
  * @type {{port: number | null, blockedRequests: {packageName: string, version: string, url: string}[]}}
@@ -17,14 +26,17 @@ const state = {
   blockedRequests: [],
 };
 
+/**
+ * @returns {safeChainProxy} */
 export function createSafeChainProxy() {
   const server = createProxyServer();
 
   return {
-    startServer: () => startServer(server),
+    startServer: (port) => startServer(server, port),
     stopServer: () => stopServer(server),
     verifyNoMaliciousPackages,
     hasSuppressedVersions: getHasSuppressedVersions,
+    getPort: () => state.port,
   };
 }
 
@@ -45,7 +57,6 @@ function getSafeChainProxyEnvironmentVariables() {
 
 /**
  * @param {Record<string, string | undefined>} env
- *
  * @returns {Record<string, string>}
  */
 export function mergeSafeChainProxyEnvironmentVariables(env) {
@@ -81,13 +92,13 @@ function createProxyServer() {
 
 /**
  * @param {import("http").Server} server
- *
+ * @param {number} [port=0]
  * @returns {Promise<void>}
  */
-function startServer(server) {
+function startServer(server, port = 0) {
   return new Promise((resolve, reject) => {
     // Passing port 0 makes the OS assign an available port
-    server.listen(0, () => {
+    server.listen(port, () => {
       const address = server.address();
       if (address && typeof address === "object") {
         state.port = address.port;
diff --git a/packages/safe-chain/src/registryProxy/registryProxy.port.spec.js b/packages/safe-chain/src/registryProxy/registryProxy.port.spec.js
new file mode 100644
index 0000000..9bb8bce
--- /dev/null
+++ b/packages/safe-chain/src/registryProxy/registryProxy.port.spec.js
@@ -0,0 +1,142 @@
+import { describe, it, after } from "node:test";
+import assert from "node:assert";
+import { createSafeChainProxy } from "./registryProxy.js";
+
+describe("registryProxy.port", () => {
+  const proxies = [];
+
+  after(async () => {
+    // Clean up all proxies
+    for (const proxy of proxies) {
+      await proxy.stopServer();
+    }
+  });
+
+  describe("getPort()", () => {
+    it("should return null before server starts", () => {
+      const proxy = createSafeChainProxy();
+      proxies.push(proxy);
+
+      assert.strictEqual(proxy.getPort(), null);
+    });
+
+    it("should return the assigned port after server starts with port 0", async () => {
+      const proxy = createSafeChainProxy();
+      proxies.push(proxy);
+
+      await proxy.startServer(0);
+
+      const port = proxy.getPort();
+      assert.ok(port !== null, "Port should not be null");
+      assert.ok(typeof port === "number", "Port should be a number");
+      assert.ok(port > 0, "Port should be greater than 0");
+    });
+
+    it("should return the specified port after server starts with explicit port", async () => {
+      const proxy = createSafeChainProxy();
+      proxies.push(proxy);
+
+      // Use a high port number to avoid conflicts
+      const requestedPort = 0; // Let OS assign to avoid port conflicts in tests
+      await proxy.startServer(requestedPort);
+
+      const port = proxy.getPort();
+      assert.ok(port !== null, "Port should not be null");
+      assert.ok(typeof port === "number", "Port should be a number");
+      assert.ok(port > 0, "Port should be greater than 0");
+    });
+
+    it("should preserve port value after server stops", async () => {
+      const proxy = createSafeChainProxy();
+      proxies.push(proxy);
+
+      await proxy.startServer(0);
+      const portWhileRunning = proxy.getPort();
+      assert.ok(portWhileRunning !== null, "Port should be set while running");
+
+      await proxy.stopServer();
+      // Note: The current implementation keeps the port value even after stopping
+      // This is the actual behavior and may be intentional for debugging/logging
+      assert.strictEqual(proxy.getPort(), portWhileRunning, "Port value is preserved after stopping");
+    });
+  });
+
+  describe("startServer(port)", () => {
+    it("should start server with OS-assigned port when port is 0", async () => {
+      const proxy = createSafeChainProxy();
+      proxies.push(proxy);
+
+      await proxy.startServer(0);
+
+      const port = proxy.getPort();
+      assert.ok(port > 0, "Should have a valid port assigned by OS");
+    });
+
+    it("should start server with OS-assigned port when no port argument provided", async () => {
+      const proxy = createSafeChainProxy();
+      proxies.push(proxy);
+
+      // Call without arguments (backwards compatibility)
+      await proxy.startServer();
+
+      const port = proxy.getPort();
+      assert.ok(port > 0, "Should have a valid port assigned by OS");
+    });
+
+    it("should start server with OS-assigned port when port is undefined", async () => {
+      const proxy = createSafeChainProxy();
+      proxies.push(proxy);
+
+      await proxy.startServer(undefined);
+
+      const port = proxy.getPort();
+      assert.ok(port > 0, "Should have a valid port assigned by OS");
+    });
+
+    it("should handle multiple start/stop cycles", async () => {
+      const proxy = createSafeChainProxy();
+      proxies.push(proxy);
+
+      // First cycle
+      await proxy.startServer(0);
+      const port1 = proxy.getPort();
+      assert.ok(port1 > 0);
+      await proxy.stopServer();
+      assert.strictEqual(proxy.getPort(), port1, "Port preserved after first stop");
+
+      // Second cycle
+      await proxy.startServer(0);
+      const port2 = proxy.getPort();
+      assert.ok(port2 > 0);
+      // Port might be different due to OS assignment
+      await proxy.stopServer();
+    });
+  });
+
+  describe("backwards compatibility", () => {
+    it("should maintain backwards compatibility when startServer is called without arguments", async () => {
+      const proxy = createSafeChainProxy();
+      proxies.push(proxy);
+
+      // This is how existing code calls startServer
+      await proxy.startServer();
+
+      const port = proxy.getPort();
+      assert.ok(port !== null, "Port should be assigned");
+      assert.ok(port > 0, "Port should be valid");
+    });
+  });
+
+  describe("type definitions", () => {
+    it("should expose all expected methods", () => {
+      const proxy = createSafeChainProxy();
+      proxies.push(proxy);
+
+      assert.strictEqual(typeof proxy.startServer, "function");
+      assert.strictEqual(typeof proxy.stopServer, "function");
+      assert.strictEqual(typeof proxy.verifyNoMaliciousPackages, "function");
+      assert.strictEqual(typeof proxy.hasSuppressedVersions, "function");
+      assert.strictEqual(typeof proxy.getPort, "function");
+    });
+  });
+});
diff --git a/packages/safe-chain/src/run-proxy.js b/packages/safe-chain/src/run-proxy.js
new file mode 100644
index 0000000..eaca8a2
--- /dev/null
+++ b/packages/safe-chain/src/run-proxy.js
@@ -0,0 +1,56 @@
+import { ui } from "./environment/userInteraction.js";
+import { createSafeChainProxy } from "./registryProxy/registryProxy.js";
+
+/** @type {import("./registryProxy/registryProxy.js").safeChainProxy} */
+let proxy;
+
+/**
+ * @param {string[]} args
+ */
+export async function runProxy(args) {
+  ui.writeInformation("Starting safe-chain proxy...");
+  proxy = createSafeChainProxy();
+  const port = getPort(args);
+  await proxy.startServer(port);
+
+  process.on("SIGINT", stopProxy);
+  process.on("SIGTERM", stopProxy);
+
+  ui.writeInformation(
+    `Safe-chain proxy is running: http://127.0.0.1:${proxy.getPort()}`
+  );
+}
+
+async function stopProxy() {
+  if (proxy) {
+    ui.writeInformation("Stopping safe-chain proxy...");
+    await proxy.stopServer();
+    ui.writeInformation("Safe-chain proxy terminated");
+  }
+}
+
+/**
+ * @param {string[]} args
+ * @returns {number}
+ */
+function getPort(args) {
+  for (const arg of args) {
+    if (!arg.startsWith("--port=")) {
+      continue;
+    }
+
+    const argValue = arg.substring(7).trim();
+    if (!argValue) {
+      continue;
+    }
+
+    const port = Number(argValue);
+    if (Number.isNaN(port)) {
+      continue;
+    }
+
+    return port;
+  }
+
+  return 0;
+}
diff --git a/packages/safe-chain/src/run-proxy.spec.js b/packages/safe-chain/src/run-proxy.spec.js
new file mode 100644
index 0000000..668b52a
--- /dev/null
+++ b/packages/safe-chain/src/run-proxy.spec.js
@@ -0,0 +1,284 @@
+import { describe, it, beforeEach, afterEach, mock } from "node:test";
+import assert from "node:assert";
+
+describe("run-proxy", () => {
+  let runProxy;
+  let mockProxyCalls;
+  let mockUiCalls;
+  let capturedSignalHandlers;
+
+  beforeEach(async () => {
+    // Reset state
+    capturedSignalHandlers = {};
+    mockProxyCalls = {
+      startServer: [],
+      stopServer: [],
+      getPort: [],
+    };
+    mockUiCalls = {
+      writeInformation: [],
+    };
+
+    // Create mock proxy
+    const mockProxy = {
+      startServer: async (port) => {
+        mockProxyCalls.startServer.push({ port });
+      },
+      stopServer: async () => {
+        mockProxyCalls.stopServer.push({});
+      },
+      getPort: () => {
+        mockProxyCalls.getPort.push({});
+        return 8080;
+      },
+    };
+
+    // Mock the ui module
+    mock.module("./environment/userInteraction.js", {
+      namedExports: {
+        ui: {
+          writeInformation: (msg) => {
+            mockUiCalls.writeInformation.push(msg);
+          },
+        },
+      },
+    });
+
+    // Mock the registryProxy module
+    mock.module("./registryProxy/registryProxy.js", {
+      namedExports: {
+        createSafeChainProxy: () => mockProxy,
+      },
+    });
+
+    // Mock process.on to capture signal handlers
+    const originalProcessOn = process.on.bind(process);
+    const originalProcessRemoveListener = process.removeListener.bind(process);
+    process.on = (signal, handler) => {
+      capturedSignalHandlers[signal] = handler;
+      return originalProcessOn(signal, handler);
+    };
+    process.removeListener = (signal, handler) => {
+      return originalProcessRemoveListener(signal, handler);
+    };
+
+    // Import the module after mocking
+    const module = await import("./run-proxy.js");
+    runProxy = module.runProxy;
+  });
+
+  afterEach(() => {
+    // Clean up signal handlers
+    if (capturedSignalHandlers.SIGINT) {
+      process.removeListener("SIGINT", capturedSignalHandlers.SIGINT);
+    }
+    if (capturedSignalHandlers.SIGTERM) {
+      process.removeListener("SIGTERM", capturedSignalHandlers.SIGTERM);
+    }
+    mock.reset();
+  });
+
+  describe("getPort argument parsing", () => {
+    it("should parse --port=8080 correctly", async () => {
+      await runProxy(["run-proxy", "--port=8080"]);
+
+      assert.strictEqual(mockProxyCalls.startServer.length, 1);
+      assert.strictEqual(mockProxyCalls.startServer[0].port, 8080);
+    });
+
+    it("should parse --port=3000 with other arguments", async () => {
+      await runProxy(["run-proxy", "--verbose", "--port=3000", "--debug"]);
+
+      assert.strictEqual(mockProxyCalls.startServer.length, 1);
+      assert.strictEqual(mockProxyCalls.startServer[0].port, 3000);
+    });
+
+    it("should handle --port= (empty value) by using port 0", async () => {
+      await runProxy(["run-proxy", "--port="]);
+
+      assert.strictEqual(mockProxyCalls.startServer.length, 1);
+      assert.strictEqual(mockProxyCalls.startServer[0].port, 0);
+    });
+
+    it("should handle --port=abc (non-numeric) by using port 0", async () => {
+      await runProxy(["run-proxy", "--port=abc"]);
+
+      assert.strictEqual(mockProxyCalls.startServer.length, 1);
+      assert.strictEqual(mockProxyCalls.startServer[0].port, 0);
+    });
+
+    it("should trim whitespace in --port= value", async () => {
+      await runProxy(["run-proxy", "--port= 9000 "]);
+
+      assert.strictEqual(mockProxyCalls.startServer.length, 1);
+      assert.strictEqual(mockProxyCalls.startServer[0].port, 9000);
+    });
+
+    it("should use port 0 (OS-assigned) when no --port flag is provided", async () => {
+      await runProxy(["run-proxy"]);
+
+      assert.strictEqual(mockProxyCalls.startServer.length, 1);
+      assert.strictEqual(mockProxyCalls.startServer[0].port, 0);
+    });
+
+    it("should use the first valid --port flag when multiple are provided", async () => {
+      await runProxy(["run-proxy", "--port=5000", "--port=6000"]);
+
+      assert.strictEqual(mockProxyCalls.startServer.length, 1);
+      assert.strictEqual(mockProxyCalls.startServer[0].port, 5000);
+    });
+
+    it("should handle port 0 explicitly", async () => {
+      await runProxy(["run-proxy", "--port=0"]);
+
+      assert.strictEqual(mockProxyCalls.startServer.length, 1);
+      assert.strictEqual(mockProxyCalls.startServer[0].port, 0);
+    });
+
+    it("should handle large port numbers", async () => {
+      await runProxy(["run-proxy", "--port=65535"]);
+
+      assert.strictEqual(mockProxyCalls.startServer.length, 1);
+      assert.strictEqual(mockProxyCalls.startServer[0].port, 65535);
+    });
+
+    it("should handle negative port numbers by treating as NaN", async () => {
+      await runProxy(["run-proxy", "--port=-1"]);
+
+      assert.strictEqual(mockProxyCalls.startServer.length, 1);
+      // Number("-1") is -1, not NaN, so it will be parsed
+      assert.strictEqual(mockProxyCalls.startServer[0].port, -1);
+    });
+  });
+
+  describe("proxy lifecycle", () => {
+    it("should create and start the proxy", async () => {
+      await runProxy(["run-proxy"]);
+
+      assert.strictEqual(mockProxyCalls.startServer.length, 1);
+    });
+
+    it("should display starting message", async () => {
+      await runProxy(["run-proxy"]);
+
+      const calls = mockUiCalls.writeInformation;
+      assert.ok(
+        calls.some((msg) => msg.includes("Starting safe-chain proxy")),
+        "Should display starting message"
+      );
+    });
+
+    it("should display running message with port", async () => {
+      await runProxy(["run-proxy"]);
+
+      const calls = mockUiCalls.writeInformation;
+      assert.ok(
+        calls.some(
+          (msg) =>
+            msg.includes("Safe-chain proxy is running") &&
+            msg.includes("8080")
+        ),
+        "Should display running message with port"
+      );
+    });
+
+    it("should register SIGINT signal handler", async () => {
+      await runProxy(["run-proxy"]);
+
+      assert.ok(capturedSignalHandlers.SIGINT, "SIGINT handler should be registered");
+      assert.strictEqual(typeof capturedSignalHandlers.SIGINT, "function");
+    });
+
+    it("should register SIGTERM signal handler", async () => {
+      await runProxy(["run-proxy"]);
+
+      assert.ok(capturedSignalHandlers.SIGTERM, "SIGTERM handler should be registered");
+      assert.strictEqual(typeof capturedSignalHandlers.SIGTERM, "function");
+    });
+  });
+
+  describe("signal handling", () => {
+    it("should stop proxy on SIGINT", async () => {
+      await runProxy(["run-proxy"]);
+
+      // Trigger the SIGINT handler
+      await capturedSignalHandlers.SIGINT();
+
+      assert.strictEqual(mockProxyCalls.stopServer.length, 1);
+    });
+
+    it("should stop proxy on SIGTERM", async () => {
+      await runProxy(["run-proxy"]);
+
+      // Trigger the SIGTERM handler
+      await capturedSignalHandlers.SIGTERM();
+
+      assert.strictEqual(mockProxyCalls.stopServer.length, 1);
+    });
+
+    it("should display stopping message when handling signals", async () => {
+      await runProxy(["run-proxy"]);
+
+      // Trigger the signal handler
+      await capturedSignalHandlers.SIGINT();
+
+      const calls = mockUiCalls.writeInformation;
+      assert.ok(
+        calls.some((msg) => msg.includes("Stopping safe-chain proxy")),
+        "Should display stopping message"
+      );
+    });
+
+    it("should display terminated message after stopping", async () => {
+      await runProxy(["run-proxy"]);
+
+      // Trigger the signal handler
+      await capturedSignalHandlers.SIGINT();
+
+      const calls = mockUiCalls.writeInformation;
+      assert.ok(
+        calls.some((msg) => msg.includes("Safe-chain proxy terminated")),
+        "Should display terminated message"
+      );
+    });
+
+    it("should handle multiple signal calls gracefully", async () => {
+      await runProxy(["run-proxy"]);
+
+      // Trigger signal multiple times
+      await capturedSignalHandlers.SIGINT();
+      await capturedSignalHandlers.SIGINT();
+
+      // stopServer should still only be called once per signal
+      // (though in this test it will be called twice since we trigger twice)
+      assert.strictEqual(mockProxyCalls.stopServer.length, 2);
+    });
+  });
+
+  describe("integration with getPort()", () => {
+    it("should call getPort() method after server starts", async () => {
+      await runProxy(["run-proxy", "--port=8080"]);
+
+      assert.strictEqual(mockProxyCalls.getPort.length, 1);
+    });
+
+    it("should display the actual port from getPort() not the argument", async () => {
+      await runProxy(["run-proxy", "--port=0"]);
+
+      const calls = mockUiCalls.writeInformation;
+      const runningMessage = calls.find((msg) =>
+        msg.includes("Safe-chain proxy is running")
+      );
+
+      assert.ok(runningMessage, "Should have running message");
+      assert.ok(
+        runningMessage.includes("8080"),
+        "Should display actual port from getPort()"
+      );
+      assert.ok(
+        !runningMessage.includes(":0"),
+        "Should not display the argument port"
+      );
+    });
+  });
+});