APIStack in 2 minutes
A quick tour: find an API, run it live with your own key, test anything in the Playground, connect AI agents over MCP, and start free.
Video tutorials
Learn APIStack in minutes
8 short walkthroughs, about 10 minutes in total. Everything on screen is the real site and real API results.
Get started
The platform, your first call, and the Playground.
Getting started: account, API key and first call
Create a free account, find your API key, run a real request and see it counted in your usage.
Playground tutorial: test any API without code
Pick an API, edit the request, add query parameters, send it, read the response and copy it as cURL.
API tutorials
Real requests and the real results they return.
Validate emails: typos, fake domains, disposable inboxes
Check syntax, MX records, disposable domains and typo suggestions like gmial.com → gmail.com, with a risk score.
Count business days excluding holidays
Working days across Christmas in the US, and a due date after Japan's Golden Week, with the holidays listed.
Loan payments and total interest in one call
Monthly payment, total interest and the first and last payment split for any amount, rate and term.
Check SSL certificate expiry for any domain
Issuer, validity dates, days until expiry and covered names, so certificates never expire by surprise.
AI agents
Connect APIStack to Claude, Cursor, VS Code and your own agents.
Give your AI agent 100+ tools with one MCP URL
Connect APIStack to Claude Code, Cursor, VS Code or your own agent, with a real agent run.
Try it yourself
The free plan includes 1,000 calls a month. No credit card needed.
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