diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..32270cb
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,177 @@
+# Based on https://raw.githubusercontent.com/github/gitignore/main/Node.gitignore
+
+# Logs
+
+logs
+_.log
+npm-debug.log_
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Caches 
+
+.cache
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# Runtime data
+
+pids
+_.pid
+_.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+
+lib-cov
+
+# Coverage directory used by tools like istanbul
+
+coverage
+*.lcov
+
+# nyc test coverage
+
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+
+bower_components
+
+# node-waf configuration
+
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+
+build/Release
+
+# Dependency directories
+
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+
+web_modules/
+
+# TypeScript cache
+
+*.tsbuildinfo
+
+# Optional npm cache directory
+
+.npm
+
+# Optional eslint cache
+
+.eslintcache
+
+# Optional stylelint cache
+
+.stylelintcache
+
+# Microbundle cache
+
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+
+.node_repl_history
+
+# Output of 'npm pack'
+
+*.tgz
+
+# Yarn Integrity file
+
+.yarn-integrity
+
+# dotenv environment variable files
+
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+
+.parcel-cache
+
+# Next.js build output
+
+.next
+out
+
+# Nuxt.js build / generate output
+
+.nuxt
+dist
+
+# Gatsby files
+
+# Comment in the public line in if your project uses Gatsby and not Next.js
+
+# https://nextjs.org/blog/next-9-1#public-directory-support
+
+# public
+
+# vuepress build output
+
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+
+.temp
+
+# Docusaurus cache and generated files
+
+.docusaurus
+
+# Serverless directories
+
+.serverless/
+
+# FuseBox cache
+
+.fusebox/
+
+# DynamoDB Local files
+
+.dynamodb/
+
+# TernJS port file
+
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+
+.vscode-test
+
+# yarn v2
+
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+
+# IntelliJ based IDEs
+.idea
+
+# Finder (MacOS) folder config
+.DS_Store
+
+.env.*
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..52a06bf
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,18 @@
+{
+  "editor.formatOnSave": true,
+  "editor.codeActionsOnSave": {
+    "source.fixAll.eslint": "explicit"
+  },
+  "[typescript]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "[javascript]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "[json]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "editor.tabSize": 2,
+  "editor.detectIndentation": false,
+  "files.insertFinalNewline": true
+}
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..9c98c29
--- /dev/null
+++ b/README.md
@@ -0,0 +1,15 @@
+# broadcast-api
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run index.ts
+```
+
+This project was created using `bun init` in bun v1.0.25. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.
diff --git a/bun.lockb b/bun.lockb
new file mode 100755
index 0000000..eb3ffac
Binary files /dev/null and b/bun.lockb differ
diff --git a/index.ts b/index.ts
new file mode 100644
index 0000000..2f98ffc
--- /dev/null
+++ b/index.ts
@@ -0,0 +1,68 @@
+import express, { type Request, type Response } from "express";
+import cors from "cors";
+import dotenv from "dotenv";
+import { xmtpClient } from "./lib/client";
+
+const envPath = `.env.${process.env.NODE_ENV}`;
+dotenv.config({ path: envPath });
+const PORT = process.env.PORT;
+const app = express();
+app.use(express.json());
+app.use(cors());
+
+app.post("/lookup", async (req: Request, res: Response) => {
+  const { address } = req.body;
+  console.log(req.body);
+  if (typeof address !== "string") {
+    console.log(req.body);
+    res.status(400).send("Address must be a string");
+    return;
+  }
+  const client = await xmtpClient;
+  const canMessage = await client.canMessage(address);
+  res.json({ onNetwork: canMessage }).status(200);
+});
+
+app.post("/subscribe", async (req: Request, res: Response) => {
+  const { address, signature } = req.body;
+  if (typeof address !== "string") {
+    res.status(400).send("Address must be a string");
+    return;
+  }
+
+  if (typeof signature !== "string") {
+    res.status(400).send("Signature must be a string");
+    return;
+  }
+  try {
+    const client = await xmtpClient;
+    // TODO: Set Signature on new conversation
+    const conversation = await client.conversations.newConversation(address);
+    await conversation.send("Welcome to Good Morning!");
+    res.status(200).send({ topic: conversation.topic });
+  } catch (err) {
+    console.error(err);
+    res.status(500).send("Internal Server Error");
+  }
+});
+
+app.get("/subscriptions", async (req: Request, res: Response) => {});
+
+app.post("/broadcast", async (req: Request, res: Response) => {
+  const { message } = req.body;
+  // Supporting sending only Text Content, but can be updated to send different types of content
+  if (typeof message !== "string") {
+    res.status(400).send("Message must be a string");
+    return;
+  }
+  const client = await xmtpClient;
+  const conversations = await client.conversations.list();
+  for (const conversation of conversations) {
+    await conversation.send(message);
+  }
+  res.status(200).send("Broadcasted message to all conversations");
+});
+
+app.listen(PORT, () => {
+  console.log(`Listening on port ${PORT}...`);
+});
diff --git a/lib/client.ts b/lib/client.ts
new file mode 100644
index 0000000..67e0e04
--- /dev/null
+++ b/lib/client.ts
@@ -0,0 +1,14 @@
+import { Wallet } from "ethers";
+import { Client, type XmtpEnv } from "@xmtp/xmtp-js";
+import { GrpcApiClient } from "@xmtp/grpc-api-client";
+import { FsPersistence } from "@xmtp/fs-persistence";
+
+const signer = process.env.KEY
+  ? new Wallet(process.env.KEY)
+  : Wallet.createRandom();
+
+export const xmtpClient = Client.create(signer, {
+  // apiClientFactory: GrpcApiClient.fromOptions,
+  basePersistence: new FsPersistence("/tmp/xmtp"),
+  env: process.env.XMTP_ENV as XmtpEnv,
+});
diff --git a/lib/listSubscribers.ts b/lib/listSubscribers.ts
new file mode 100644
index 0000000..9c368fa
--- /dev/null
+++ b/lib/listSubscribers.ts
@@ -0,0 +1,13 @@
+import { xmtpClient } from "./client";
+
+interface Subscriber {
+  address: string;
+  canMessage: boolean;
+}
+
+export const listSubscribers = async (): Promise<Subscriber[]> => {
+  const client = await xmtpClient;
+
+  return [];
+  // subscribers: conversation.subscribers,
+};
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..5706461
--- /dev/null
+++ b/package.json
@@ -0,0 +1,27 @@
+{
+  "name": "broadcast-api",
+  "module": "index.ts",
+  "type": "module",
+  "scripts": {
+    "start": "bun run index.ts",
+    "dev": "bun --env.NODE_ENV=dev --watch run index.ts"
+  },
+  "devDependencies": {
+    "@types/bun": "latest",
+    "@types/cors": "^2.8.17",
+    "@types/express": "^4.17.21"
+  },
+  "peerDependencies": {
+    "typescript": "^5.0.0"
+  },
+  "dependencies": {
+    "@xmtp/fs-persistence": "^0.0.4",
+    "@xmtp/grpc-api-client": "^0.2.4",
+    "@xmtp/xmtp-js": "^11.5.1",
+    "cors": "^2.8.5",
+    "dotenv": "^16.4.5",
+    "ethers": "^6.12.0",
+    "express": "^4.19.2",
+    "viem": "^2.9.29"
+  }
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..dcd8fc5
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,22 @@
+{
+  "compilerOptions": {
+    "lib": ["ESNext"],
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    /* Linting */
+    "skipLibCheck": true,
+    "strict": true,
+    "noFallthroughCasesInSwitch": true,
+    "forceConsistentCasingInFileNames": true
+  }
+}