Merge pull request #4339 from JEONSEWON/JEONSEWON-patch-1

Add CheckAPI to Monitoring section

README.md

@@ -549,6 +549,7 @@ This list results from Pull Requests, reviews, ideas, and work done by 1600+ peo
   * [Bencher](https://bencher.dev/) - A continuous benchmarking tool suite to catch CI performance regressions. Free for all public projects.
   * [BugBug](https://bugbug.io/) - Lightweight test automation tool for web applications. It is easy to learn and doesn't require coding. You can run unlimited tests on your own computer for free. You also get cloud monitoring and CI/CD integration for an additional monthly fee.
   * [checkbot.io](https://www.checkbot.io/) - Browser extension that tests if your website follows 50+ SEO, speed and security best practices. Free tier for smaller websites.
+  *   * [CheckAPI](https://checkapi.io) - API health monitoring with Silent Failure Detection — validates response body via JSON Path assertions and regex, not just HTTP status codes. Free plan includes 10 monitors, 5-minute intervals, all 5 alert channels (Email, Slack, Telegram, Discord, Webhook), and is free for commercial use with no time limit.
   * [Checkly](https://checklyhq.com) - Code-first synthetic monitoring for modern DevOps. Monitor your APIs and apps at a fraction of the price of legacy providers. Powered by a Monitoring as Code workflow and Playwright. Generous free tier for devs.
   * [CORS-Tester](https://cors-error.dev/cors-tester/) - A free tool for developers and API testers to check if an API is CORS-enabled for a given domain and identify gaps. Get actionable insights.
   * [cypress.io](https://www.cypress.io/) - Fast, easy and reliable testing for anything that runs in a browser. Cypress Test Runner is always free and open-source with no restrictions and limitations. Cypress Dashboard is free for open-source projects for up to 5 users.