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RSQ API vs VATlayer

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

APIRSQ APIHEALTHY91VATlayerHEALTHY93
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms783473
P95 · ms13872118
AuthnoneapiKey
CORSyesno
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

RSQ API vs VATlayer: common questions

Which is more reliable, RSQ API or VATlayer?

Both are neck-and-neck — RSQ API and VATlayer each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, RSQ API or VATlayer?

VATlayer has the lower median latency in our checks — RSQ API responds in 783 ms versus VATlayer at 473 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do RSQ API and VATlayer need an API key?

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

Can I call RSQ API and VATlayer from the browser?

Neither sends browser-friendly CORS headers reliably, so call RSQ API and VATlayer from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are RSQ API and VATlayer free for commercial use?

RSQ API has unclear commercial terms, and VATlayer 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.