Amazon API Gateway
Create, maintain, and secure REST, HTTP, and WebSocket APIs at any scale with a fully managed AWS service.
Visit site12 Platforms · Checked July 2026
APIContext (formerly APImetrics)
Synthetic, end-to-end API monitoring that simulates the full customer journey and provides meaningful metrics for hard-to-monitor APIs.
Visit siteAssertible
Automated QA tools to test and monitor your web services across deployments and environments.
Visit siteBlazeMeter
An API and performance load-testing service by Perforce that provides real-time reporting across 20+ open-source frameworks.
Visit sitehttpbin
Provides an array of HTTP API endpoint responses that are useful for testing or debugging front ends that send requests.
Visit siteIBM API Connect
An enterprise-grade platform for creating, securing, managing, sharing, monetizing, and analyzing custom APIs on-premises and on the cloud.
Visit siteJSONPlaceholder
A free online REST API you can use whenever you need fake data — serving roughly 3 billion requests each month.
Visit siteLoader.io
A free load-testing service that lets you stress test your web apps and APIs with thousands of concurrent connections.
Visit siteMockable
A simple, configurable service to mock out RESTful API or SOAP web services — no sign-up required.
Visit siteMockbin (by Zuplo)
Spin up a fixed-response API endpoint in seconds and inspect every request sent to it — free and open source.
Visit siteBlazeMeter API Monitoring (formerly Runscope)
24/7 API reliability monitoring that validates contracts, uptime, and latency from cloud or private locations.
Visit siteSwagger Explore (formerly Swagger Inspector)
Test API endpoints and verify responses with a free, simple client that anyone on the team can master.
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