NASA APOD vs USGS Water Services
Same instrument, two spec sheets — measured, not claimed.
NASA APOD vs USGS Water Services: common questions
Which is more reliable, NASA APOD or USGS Water Services?
On our scheduled checks, USGS Water Services leads on measured uptime — NASA APOD at —% versus USGS Water Services 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 NASA APOD and USGS Water Services need an API key?
USGS Water Services needs no key, while NASA APOD requires a free API key. If you want to start calling without signup, reach for USGS Water Services first.
Can I call NASA APOD and USGS Water Services from the browser?
Yes — both NASA APOD and USGS Water Services 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 NASA APOD and USGS Water Services free for commercial use?
NASA APOD allows commercial use on its free tier, and USGS Water Services allows commercial use on its free tier. 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.