How to Connect Software Without APIs

Not every system has a public API. In fact, the majority of data on the internet lives behind login walls, inside portals, and within systems that were never built to talk to other software. Legacy utilities, government portals, insurance carriers, ERP platforms, HR systems — most of these operate without any developer-accessible endpoint.

So what do you do when you need to connect to a system that doesn't have an API?

Why the API Gap Exists

APIs are expensive to build and maintain. Not every organization has the engineering capacity or business incentive to expose their data programmatically. Some systems are decades old and were built in eras before APIs were standard. Others simply don't prioritize developer access as part of their business model.

This means many critical data sources remain accessible only through their front-end interfaces — the same pages a human user would interact with.

Option 1: Wait for an Official API

Sometimes waiting is the right call — but it often isn't. API roadmaps at large companies move slowly, and there's no guarantee a public API will ever ship for the specific functionality you need. In fast-moving product environments, waiting isn't a strategy.

Option 2: Build Your Own Web Automation

Screen scraping and browser automation (tools like Selenium, Puppeteer, or Playwright) can technically access any web-based system. But building and maintaining your own automation is harder than it looks:

• Websites change constantly. A redesign or even a minor CSS update can break your entire script.
• Authentication is complex. MFA, CAPTCHA, session tokens, and anti-bot detection all stand between your script and the data.
• Maintenance never ends. The script you build today needs ongoing monitoring, debugging, and revision.
• Scaling is painful. Running automation across thousands of users introduces performance and reliability challenges most teams aren't built to handle.

Option 3: Use a Browser-Native Agent Platform

A more reliable approach is to use a purpose-built platform designed specifically for connecting to login-gated systems. This is what Deck does.

Instead of building one-off automation scripts, Deck provides a unified API that gives your product access to any web system — regardless of whether it has an official API. The platform handles everything that makes web automation hard:

• Authentication: Deck manages login flows, MFA, CAPTCHA, and session handling for over 100,000 portals.
• Resilience: Deck's agents are self-healing — they adapt to UI changes automatically.
• Security: All sessions are user-permissioned and run in a secure, compliant environment.
• Reads and writes: Deck supports both data extraction and actions like form submissions, payment updates, and document uploads.

How It Works in Practice

Imagine you need to connect your product to a utility provider's billing portal. There's no API. The only access point is through the provider's website. With Deck:

1. The user authorizes the connection through a consent flow.
2. Deck logs in using the user's credentials in a secure browser session.
3. Deck navigates to the billing section, extracts the relevant data, and returns it as structured JSON.
4. If the portal layout changes, Deck detects the change and adapts automatically.

From your product's perspective, it looks and behaves like a standard API call — even though there's no API on the other side.

When Does This Approach Make Sense?

• You need to access a system that doesn't have an API — utility, insurance, government, legacy enterprise
• You've already tried building your own automation and it keeps breaking
• You need to support many different portals and can't maintain custom code for each one
• Your product involves user-permissioned access to their own accounts
• You need bidirectional access — not just reading data, but also submitting actions

Final Thought

The API gap is real, but it's not a dead end. Modern platforms are built to bridge the space between what APIs offer and what the web actually contains. When you connect to software the way a user would — through the front door, with permission, and with reliable infrastructure — you unlock a much larger world of data and automation than APIs alone can provide.