Web tunnels are one of those tools that, once you start using them, you wonder how you ever got by without them. At their core, they do something simple: expose your local development server to the public internet through a secure URL. But the ways developers put that capability to work are remarkably varied. Here are ten real-world use cases we see every day.

1. Stripe Webhook Testing

Payment integration is notoriously difficult to test locally. Stripe sends webhooks — HTTP POST requests — to a URL you specify when events like successful payments, refunds, or subscription changes occur. The problem? Stripe can't reach `localhost:3000`. The traditional workaround is deploying to a staging server every time you change your webhook handler. With a web tunnel, you create a public URL pointing at your local server, paste it into Stripe's webhook configuration, and test payment flows in real time. You can watch webhook payloads arrive in your terminal, set breakpoints in your IDE, and iterate in seconds instead of minutes. When you're done, the tunnel expires and the endpoint vanishes.

2. GitHub/GitLab Webhook Testing

The same pattern applies to Git platform webhooks. Whether you're building a CI/CD bot, a deployment automation tool, or a code review assistant, you need GitHub or GitLab to send events to your server when pushes, pull requests, or issues are created. Setting up a tunnel lets you develop and debug these integrations locally with real webhook payloads, complete with proper signatures and headers. No more deploying to a server just to test if your push handler correctly parses the commit SHA.

3. Slack Bot Development

Slack's Events API and interactive components require a publicly accessible URL. When a user mentions your bot, Slack sends an HTTP request to your configured endpoint. During development, you need that endpoint to be your local machine. A tunnel gives your Slack bot a stable public URL while you develop. You can test slash commands, interactive messages, modal submissions, and event subscriptions — all while running your bot locally with hot reload. The development feedback loop goes from "deploy, wait, test, repeat" to "save, test, repeat."

4. Client Demos

You're on a Zoom call with a client and want to show them the feature you've been working on. It's running on your laptop, not deployed anywhere. Without a tunnel, your options are screen sharing (laggy, no interaction) or scrambling to deploy (risky, time-consuming). With a tunnel, you share a URL in the chat and the client interacts with your application directly in their browser. They can click buttons, fill forms, and experience the feature exactly as it will work in production. For 25¢, you've turned your laptop into a demo server.

5. Mobile App Testing

If you're building a React Native or Flutter app that communicates with a local API, you know the pain of testing on physical devices. The device can't reach `localhost` on your development machine (unless you're on the same network and configure IP addresses manually). A web tunnel gives your mobile app a real HTTPS URL to hit, so you can test API calls, authentication flows, and real-time features from your phone or tablet — even if you're on a different network. This is especially valuable for testing on cellular connections to see how your app handles real-world latency.

6. OAuth Callback Testing

OAuth providers like Google, Facebook, and GitHub require you to register a redirect URI — the URL users are sent to after authentication. During development, you need this to point at your local server. Some providers allow `localhost` redirect URIs, but many don't, and even those that do sometimes behave differently than production. A tunnel gives you a proper HTTPS URL to use as your OAuth callback, letting you test the full authentication flow end-to-end. No more "it works in production but not locally" surprises.

7. QA Team Testing

Your feature branch is ready for testing, but deploying it to a shared staging environment would conflict with other developers' work. Instead of setting up a separate preview environment (which takes time and resources), you spin up a tunnel pointing at your local feature branch. Share the URL with your QA team and they can test immediately. They get a real, interactive environment running the exact code from your branch. When QA signs off, you close the tunnel and merge with confidence.

8. Pair Programming

Remote pair programming often relies on screen sharing or VS Code Live Share. But sometimes your pairing partner needs to interact with the running application — not just see the code. A tunnel lets you share your local development server so your partner can open the app in their own browser, test interactions, and provide feedback. Combined with a code-sharing tool, this creates a complete remote collaboration environment. Both developers can see code changes and immediately test them in the running app.

9. IoT Device Communication

IoT development often involves devices that need to send data to a server — sensor readings, status updates, or event notifications. During development, your server runs locally but your IoT device is on a different network (or a cellular connection). A tunnel bridges this gap, giving your IoT device a public endpoint to send data to. You can test MQTT callbacks, HTTP sensor payloads, and device registration flows without deploying your backend. This is invaluable for rapid prototyping with Arduino, Raspberry Pi, or ESP32 devices.

10. CI/CD Debugging

When a CI/CD pipeline fails and you can't reproduce the issue locally, sometimes you need the pipeline to interact with a local service. Maybe you need the pipeline to hit a local API to test an integration, or you need to temporarily expose a local database for a migration test. A tunnel lets you create that bridge between your CI/CD environment and your local machine. Set up the tunnel, configure the pipeline to use the tunnel URL, run the failing step, and debug in real time. Once you've identified the issue, the tunnel auto-expires and there's no cleanup needed.

Getting Started

Every one of these use cases works with 25cent.cloud's web tunnels. Create a tunnel from your dashboard, point it at any local port, and you get a public HTTPS URL in seconds. No agents to install, no configuration files to manage, no daemons running in the background. Set a timer from 1 to 24 hours, and the tunnel cleans itself up when you're done. Each hour costs just one quarter — 25¢ to turn your laptop into a public server.