US Autocomplete
US Autocomplete — free tier with API key
AUTH APIKEYCORS ✓AGENT ✓HTTPS ✓COMMERCIAL ?
US Autocomplete exposes a free-tier JSON API. Register for an API key if required; we verified a public or demo endpoint.
CHECK TIER · REACHABILITY
We probe without your API key. A 401/403 auth wall means the server is up — not a full health pass.
Uptime history
99.02%90d reachable
98.3%30d reachable
6hLast check · since JUL 8 · server OK
Live response samplecaptured by our last successful check
GET https://us-autocomplete-pro.api.smarty.com/lookup?key=YOUR+EMBEDDED+KEY+HERE\u0026search=123+mai\u0026include_only_cities=chicago%2Cil\u0026include_only_states=mi\u0026prefer_states=il
{
"errors": [
{
"id": 1611079217,
"message": "Authentication required (1611079217)"
}
]
}Call itcurl · fetch · python
curl "https://us-autocomplete-pro.api.smarty.com/lookup?key=YOUR+EMBEDDED+KEY+HERE\u0026search=123+mai\u0026include_only_cities=chicago%2Cil\u0026include_only_states=mi\u0026prefer_states=il"const res = await fetch("https://us-autocomplete-pro.api.smarty.com/lookup?key=YOUR+EMBEDDED+KEY+HERE\u0026search=123+mai\u0026include_only_cities=chicago%2Cil\u0026include_only_states=mi\u0026prefer_states=il");
const data = await res.json();
console.log(data);import requests
res = requests.get("https://us-autocomplete-pro.api.smarty.com/lookup?key=YOUR+EMBEDDED+KEY+HERE\u0026search=123+mai\u0026include_only_cities=chicago%2Cil\u0026include_only_states=mi\u0026prefer_states=il")
print(res.json())Auth wall reachable — GET /lookup?key=YOUR+EMBEDDED+KEY+HERE\u0026search=123+mai\u0026include_only_cities=chicago%2Cil\u0026include_only_states=mi\u0026prefer_states=il (key stripped)683 mschecked 6h ago
GET
/lookup?key=YOUR+EMBEDDED+KEY+HERE\u0026search=123+mai\u0026include_only_cities=chicago%2Cil\u0026include_only_states=mi\u0026prefer_states=ilPROBEDUS Autocomplete — free tier with API key
GET
/lookup?limit=5Lookup — documented GET route.
GET
/lookup?page=1Lookup — documented GET route.
Machine-readable spec
We probe without your API key. A 401/403 auth wall means the server is up — not a full health pass. Export includes every documented route below.
Response-shape history
Stable. No schema drift observed since monitoring began — the response shape has not changed under our checks.
US Autocomplete: common questions
Is US Autocomplete free to use?
Yes — US Autocomplete is a free developer tools API. Free tier: Free tier — API key required. Whether the free tier allows commercial use is unclear — check the provider docs.
Does US Autocomplete need an API key?
Yes — US Autocomplete needs a free API key, which you pass on each request. Rate limits: Unpublished.
Can I call US Autocomplete from the browser?
Yes — US Autocomplete returns CORS headers over HTTPS, so front-end code can fetch it directly with no backend proxy. Use the fetch snippet on this page, or hit "Run live" to try it now.
Is US Autocomplete up right now?
As of our last scheduled check, US Autocomplete is healthy with 99.02% uptime over 90 days and a 683 ms median response. We re-probe it every sweep — the status badge and uptime chart above always show the latest.