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RSQ API vs US Autocomplete

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

APIRSQ APINEW—US AutocompleteREACHABLE—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

RSQ API vs US Autocomplete: common questions

Which is more reliable, RSQ API or US Autocomplete?

On our scheduled checks, US Autocomplete leads on measured uptime — RSQ API at —% versus US Autocomplete 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 RSQ API and US Autocomplete need an API key?

RSQ API needs no key, while US Autocomplete requires a free API key. If you want to start calling without signup, reach for RSQ API first.

Can I call RSQ API and US Autocomplete from the browser?

Only US Autocomplete is browser-friendly — it returns CORS headers over HTTPS. RSQ API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are RSQ API and US Autocomplete free for commercial use?

RSQ API has unclear commercial terms, and US Autocomplete 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.