Beeceptor vs Wandbox

Beeceptor lets you spin up a mock REST endpoint at a custom subdomain in seconds, define rule-based JSON, XML, plain-text, or binary responses through a no-code rule builder, and inspect the live requests hitting it in real time. It also doubles as an HTTP proxy for intercepting and rewriting responses from a real backend during development. The free tier needs no signup or API key — 50 requests/day per endpoint with up to 3 rules — with paid plans from $10/month unlocking private endpoints, higher volume, and CI/CD integration.

Wandbox is a free "social compilation service" built by melpon and kikairoya, offering 175 compiler configurations across 35 languages — from mainstream C++, Python, Rust, and Go to niche picks like Lazy K and Pony — including nightly HEAD builds of GCC and Clang. Its REST API needs no key: POST source code, a compiler ID, and options to /api/compile.json (or the /ndjson variant for streamed output) and get back compile/runtime output plus a permanent shareable permalink, while /api/list.json enumerates every compiler and its supported switches. The project was rewritten in 2024–2026 from a legacy Ruby backend to Rust (feline) and Remix (canine), which is why the old kennel2/API.rst docs path 404s — the live API endpoints themselves are unchanged.