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Stock Sentiment API vs NASA APOD

Same instrument, two spec sheets — measured, not claimed.

APIStock Sentiment APIUNMONITORED—NASA APODHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedPublic domain (US Gov)
Free tierFree tier — API key may be required for production1,000 req/hour with free key
Rate limitUnpublishedDEMO_KEY: 30/hour, 50/day
In directory since2026-07-052026-05-02
operationalpartialdownno data

Stock Sentiment API vs NASA APOD: common questions

Which is more reliable, Stock Sentiment API or NASA APOD?

Only NASA APOD is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do Stock Sentiment API and NASA APOD need an API key?

Both ask you to authenticate — Stock Sentiment API uses an API key and NASA APOD 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 Stock Sentiment API and NASA APOD from the browser?

Yes — both Stock Sentiment API and NASA APOD 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 Stock Sentiment API and NASA APOD free for commercial use?

Stock Sentiment API has unclear commercial terms, and NASA APOD 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.