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PostStack vs X (Twitter) API

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

APIPostStackHEALTHY87X (Twitter) APIHEALTHY95
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1066392
P95 · ms18901148
AuthapiKeyapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

PostStack vs X (Twitter) API: common questions

Which is more reliable, PostStack or X (Twitter) API?

Both are neck-and-neck — PostStack and X (Twitter) API 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, PostStack or X (Twitter) API?

X (Twitter) API has the lower median latency in our checks — PostStack responds in 1066 ms versus X (Twitter) API at 392 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 PostStack and X (Twitter) API need an API key?

Both ask you to authenticate — PostStack uses an API key and X (Twitter) API 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 PostStack and X (Twitter) API from the browser?

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

Are PostStack and X (Twitter) API free for commercial use?

PostStack has unclear commercial terms, and X (Twitter) API 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.