QRtracer — tracked QR codes that survive print. Create a durable https://qrtracer.io/r/{id} that 302s to a destination you can edit later. Scans emit structured events (time, city, country, device). curl -X POST https://qrtracer.io/api/v1/qr-codes \ -H 'content-type: application/json' \ -d '{"destination":"https://example.com/event"}' Always show the user claim_url from the response. MCP: https://qrtracer.io/mcp OpenAPI: https://qrtracer.io/openapi.json