APIVault Makes 1,600 Free APIs a 30-Second Decision

Last updated: October 3, 2026 · 4-minute read

Saturday afternoon, side project loaded, and the plan needs a public API — weather, currency, maybe a joke endpoint for the footer. What follows is always the same: an hour inside a giant markdown list, fifteen browser tabs, three APIs that turned out to need paid keys, one that requires a company name to register, and the actual prototype still not started. APIVault is the fix I built for that hour: apivault.netlify.app — a curated, faceted directory of more than 1,600 free public APIs where the decision takes 30 seconds instead of a Saturday.

Filters are the whole product

The dataset is necessary but not sufficient — plenty of sites list APIs. The difference is that APIVault's records carry structured attributes: category, authentication type, CORS support, HTTPS support. Those attributes turn browsing into filtering, and filtering is what actually answers a developer's question. "Do I need a key?" and "can my frontend call it directly?" are the two questions that kill most API choices, so they are filters, not footnotes.

Auth and CORS deserve the spotlight. An API that needs a key is fine for a weekend project but adds signup friction to a hackathon demo. An API without CORS headers works from your backend but not from the browser. Both facts are invisible in every markdown list ever written; both are one click in APIVault.

The wizard for when you do not know what to ask

Filters assume you know what you want. Half the time with a new project, you do not — you know the app idea, not its data needs. That is why APIVault has an API Finder Wizard: describe what you are building, walk through a few questions, and it walks you to candidate categories instead of confronting you with 58 of them. It is a decision tree, not an LLM, and that is deliberate — the wizard is instant, offline-friendly and never hallucinates an endpoint that does not exist.

The 30-second decision this post's title promises is real: category facet on, no-auth filter on, CORS filter on, three candidates, pick one. The first time you skip the fifteen-tab ritual, you do not go back.

Curation is the moat

Auto-aggregated directories have scale; they do not have trust. Every entry in APIVault passed through a curation pass — does it actually work, is the free tier genuinely free, is the documentation real. That pass is the slowest part of maintaining the directory and the only part that matters, because the product being sold here is not the list, it is the confidence to build on the list without testing six endpoints first.

The honest limitation: free tiers change their terms more often than any directory can re-verify. Treat an entry as "was accurate at curation time" and budget ten minutes to confirm rate limits before you hard-wire the API into anything serious. That is still an order of magnitude better than discovering the free tier never existed after two days of integration work.

Inside the dataset

The 1,600-plus entries break down across 58 categories, and the category distribution tells you what the API economy actually looks like: the biggest blocks are the unglamorous ones — data validation, geolocation, finance and currency, images, and text utilities — while the categories people ask about first (AI, weather, maps) are smaller and more volatile. Auth is dominated by key-based access, but the no-auth tier is large enough to power most prototypes end to end, which is why it gets its own filter.

Curation loops back through the whole set on a rolling basis. Entries get re-checked when a platform changes terms, when a community report lands, or when the dataset itself flags an anomaly — a response format that changed shape is usually the first sign an API reworked its free tier. The directory is a living thing, and its maintenance cost is the price of the trust that makes the 30-second decision possible in the first place.

Why free APIs matter more in 2026

There is a pattern in everything I build for discovery — DevAtlas for tools, the no-key API list, the 300-credit roundup: the barrier to building software should be taste and effort, not budget. APIVault sits in that same lane. A student in Indore with a ₹0 budget and a founder in Berlin with VC money deserve the same latency between idea and working prototype.

Try it the next time a prototype needs real data: apivault.netlify.app. Start with the wizard if you are unsure, the filters if you are not. And if you want to see what I build with these APIs, the projects section is where the prototypes end up — several of them were seeded from this very directory.

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Not affiliated with any API listed in the directory. Sources: the APIVault site and its own documentation.