The latest articles on Forem by Guilherme (@guilherme_641bb701e38bc6b). https://forem.com/guilherme_641bb701e38bc6b https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3688944%2F6fc128f8-2d3b-4af9-b428-1afc147304b0.png https://forem.com/guilherme_641bb701e38bc6b en Guilherme Thu, 01 Jan 2026 20:52:53 +0000 https://forem.com/guilherme_641bb701e38bc6b/how-i-built-a-self-hosted-address-validation-tool-with-fastapi-docker-to-save-2000year-1p69 https://forem.com/guilherme_641bb701e38bc6b/how-i-built-a-self-hosted-address-validation-tool-with-fastapi-docker-to-save-2000year-1p69 <p>Hi everyone! </p> <p>As developers, we know how expensive SaaS APIs can get. Address validation is one of those silent killers—it starts cheap, but as your app grows, you find yourself paying $100, $500, or even $2,000 a month just to verify where your users live.</p> <p>I decided to fix this for my own projects, and today I'm sharing the result: <strong>Global Address Finder PRO</strong>.</p> <h2> Why Self-Hosted? </h2> <p>By self-hosting your address validation, you get:</p> <ol> <li> <strong>Zero latency:</strong> The data is right there in your infrastructure.</li> <li> <strong>Data Privacy:</strong> Your user addresses never leave your server.</li> <li> <strong>Fixed Cost:</strong> No more "pay-per-request" anxiety.</li> </ol> <h2> The Tech Stack </h2> <p>I chose these tools for maximum performance:</p> <ul> <li> <strong>FastAPI:</strong> Because it's lightning-fast and provides automatic Swagger docs.</li> <li> <strong>Redis:</strong> Used as a high-speed cache layer for instant lookups.</li> <li> <strong>Docker:</strong> So you can deploy the entire stack with a single command.</li> </ul> <h2> How it works </h2> <p>The tool is designed to be a "drop-in" replacement for more expensive services. You spin up the container, and you're ready to go in under 5 minutes.</p> <h3> 🚀 Get Early Bird Access </h3> <p>I’ve just launched the PRO version for developers who want to own their infrastructure. It's currently available for a one-time payment of <strong>$29</strong> (Early Bird).</p> <p><strong>You can check it out here:</strong> [Global Address Finder PRO on Ko-fi] <a href="https://ko-fi.com/s/f997d5ec2f" rel="noopener noreferrer">https://ko-fi.com/s/f997d5ec2f</a></p> <p>I'm looking for <strong>honest feedback</strong>! </p> <ul> <li>Does this stack fit your workflow?</li> <li>What regions would you like to see supported next?</li> </ul> <p>Let's chat in the comments!</p> python fastapi selfhosted docker