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MediaCaption API vs YouTube Transcript Search API by Arcmira

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

APIMediaCaption APIDOCS OK100YouTube Transcript Search API by ArcmiraREACHABLE100
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms10132109
P95 · ms21013179
AuthapiKeyapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data license
Free tier10 credits when you sign up
Rate limit60 req/min
In directory since2026-07-182026-10-12
operationalpartialdownno data

MediaCaption API vs YouTube Transcript Search API by Arcmira: common questions

Which is more reliable, MediaCaption API or YouTube Transcript Search API by Arcmira?

Both are neck-and-neck — MediaCaption API and YouTube Transcript Search API by Arcmira 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, MediaCaption API or YouTube Transcript Search API by Arcmira?

MediaCaption API has the lower median latency in our checks — MediaCaption API responds in 1013 ms versus YouTube Transcript Search API by Arcmira at 2109 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 MediaCaption API and YouTube Transcript Search API by Arcmira need an API key?

Both ask you to authenticate — MediaCaption API uses an API key and YouTube Transcript Search API by Arcmira 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 MediaCaption API and YouTube Transcript Search API by Arcmira from the browser?

Yes — both MediaCaption API and YouTube Transcript Search API by Arcmira 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 MediaCaption API and YouTube Transcript Search API by Arcmira free for commercial use?

MediaCaption API allows commercial use on its free tier, and YouTube Transcript Search API by Arcmira 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.