QR code vs Wandbox

goQR.me's QR code API, served from api.qrserver.com rather than the marketing domain, offers two commands: create-qr-code renders a PNG, SVG, or EPS QR image from a data string, while read-qr-code decodes an existing QR image (by URL or upload) and returns the result as JSON. Run by Foundata GmbH, it imposes no request limit beyond reserving the right to reject abusive traffic, and it logs only the requesting referrer/IP, never the QR content itself.

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.