Plaid

Plaid is the infrastructure layer that connects applications to users' bank accounts. If you've ever linked a bank account inside a fintech app, Venmo, Robinhood, Coinbase, or thousands of others, there's a very good chance Plaid was the technology behind that connection. Plaid provides APIs for account verification, balance checks, transaction history, identity verification, income verification, and asset reports. For custom web application development, Plaid is essential when building anything that touches financial data: expense trackers, lending platforms, budgeting tools, payment apps, or any system that needs to verify a user's bank account or pull in their transaction history. The integration workflow is straightforward, Plaid Link (a drop-in UI component) handles the bank login flow, then your backend uses access tokens to query the Plaid API for whatever financial data you need. The developer experience is excellent, with thorough documentation and a sandbox that simulates every edge case.

From Zero to Standard

Plaid was founded in 2013 by Zach Perret and William Hockey, two college friends who met at Duke University. They originally set out to build a consumer budgeting app, but quickly realized the hardest part wasn't the app itself, it was connecting to bank accounts. Every bank had a different system, different authentication flow, and different data format. So they pivoted and decided to solve that connectivity problem for everyone. The early days were grueling: Perret and Hockey had to manually build integrations to individual banks, often reverse-engineering legacy banking systems that had no modern APIs. They launched Plaid's API in 2013 and slowly gained traction with early fintech startups. Visa attempted to acquire Plaid in 2020 for $5.3 billion, but the deal was blocked by the Department of Justice on antitrust grounds. Plaid remained independent and raised additional funding at a $13.4 billion valuation.

The Technical Edge

When Plaid first started, most banks didn't offer APIs at all. Plaid had to connect to banks by essentially screen-scraping, logging in as the user and reading the HTML of the bank's website to extract account data. This was technically fragile and occasionally broke when banks updated their websites, but it was the only way to build a universal banking data layer at the time. Plaid has since transitioned most connections to direct API integrations with banks through partnerships, but the screen-scraping origin explains why the company had to build such sophisticated data normalization, they were taking wildly inconsistent HTML from thousands of bank websites and turning it into a clean, standardized JSON API. Also, Plaid now connects to over 12,000 financial institutions, and an estimated one in four Americans with a bank account has connected that account through Plaid.

Visit: plaid.com