The QR Generator API was supposed to be the boring one in my toolkit: POST a string, get an image back. No parsers, no pagination, no file formats. It turned out to have the most physical-world failure mode of anything I run. A few weeks after I packaged it ( https://x402.freeq.one/tools/qr_generator.html ), an agent building conference tickets embedded my QR codes straight into a PDF layout — flush against the ticket art, no padding. On my preview page every code scanned instantly. On the pr...