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Abstract API vs US Autocomplete

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

APIAbstract APIHEALTHY89US AutocompleteREACHABLE99
Uptime · 30d
Uptime · 90d99.02%99.02%
Uptime · 30d98.3%98.3%
P50 · ms700683
P95 · ms16561917
AuthapiKeyapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key may be required for productionFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Abstract API vs US Autocomplete: common questions

Which is more reliable, Abstract API or US Autocomplete?

Both are neck-and-neck — Abstract API and US Autocomplete each measure 99.02% 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, Abstract API or US Autocomplete?

US Autocomplete has the lower median latency in our checks — Abstract API responds in 700 ms versus US Autocomplete at 683 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 Abstract API and US Autocomplete need an API key?

Both ask you to authenticate — Abstract API uses an API key and US Autocomplete 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 Abstract API and US Autocomplete from the browser?

Yes — both Abstract API and US Autocomplete 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 Abstract API and US Autocomplete free for commercial use?

Abstract 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.