Beyond Google's Favicon Trick: A Real Logo API

Google's unofficial favicon service, commonly accessed via a URL like google.com/s2/favicons, is a convenient trick developers use to grab a small site icon without any setup. It was never published as a supported API, has no documented uptime commitment, no rate-limit guarantees, and no terms of service covering commercial use -- Google can change or remove it at any time without notice. For a side project or internal tool that's an acceptable risk. For a fintech app displaying company branding to real customers, depending on an unofficial, unsupported endpoint is a fragile foundation for something users see on every screen.

Favicons are designed to be tiny -- typically 16x16 or 32x32 pixels, meant for a browser tab, not a UI element. Stretched into a larger logo slot on a trading dashboard, portfolio card, or bank selection screen, a favicon looks visibly pixelated, especially on high-DPI mobile screens. logostream.dev serves 100% SVG logos instead, which scale cleanly to any size a UI needs -- from a compact ticker row to a full-width hero image -- without the blurriness a stretched 32x32 favicon shows once it's larger than its native resolution. That difference is especially visible on modern retina displays, where a low-resolution favicon that looked acceptable a few years ago now reads as clearly out of place next to sharper interface elements.

A favicon endpoint only ever accepts a domain -- there's no way to query it by ticker, ISIN, or WKN, so any application needing to resolve a stock or fund by its financial identifier has to first find that company's domain through a separate step. logostream.dev accepts domain lookups too, but adds ticker, ISIN, and WKN as equally first-class parameters, so a fintech app can query directly with whichever identifier it already has on hand -- no separate domain-lookup step required before the logo request can even be made. Removing that lookup step also removes a place where the mapping between a security and its domain can silently go stale or wrong.