httpSMS vs PaperClean
Same instrument, two spec sheets — measured, not claimed.
httpSMS vs PaperClean: common questions
Which is more reliable, httpSMS or PaperClean?
On our scheduled checks, PaperClean leads on measured uptime — httpSMS at —% versus PaperClean at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Do httpSMS and PaperClean need an API key?
Both ask you to authenticate — httpSMS uses an API key and PaperClean uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.
Can I call httpSMS and PaperClean from the browser?
Yes — both httpSMS and PaperClean send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.
Are httpSMS and PaperClean free for commercial use?
httpSMS has unclear commercial terms, and PaperClean has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.