PaidWord Intelligence API
List related words
GET/words/{word}/relatedMember key
A word's synonyms then related words, closest first, with their open names.
Synonyms (levels 0 and 1) then related words (level 2), closest first. Neighbours with a deny class are left out.
AccessA member key (Founder or Investor) or a paid RapidAPI subscription to this API.
BillingOne call.
PlanInvestor plan. A Founder key answers 403
plan_required.FormatsJSON
Keep a key on a server: a page a visitor loads shows it to everyone.
Request
wordstringRequiredPathThe catalog slug, the word, or wrd_<id>.
limitintegerOptionalQueryRows, 1 to 50.
fieldsstringOptionalQueryComma-separated top-level keys to keep; an unknown key answers 400 unsupported_field.
curl -X GET "https://api.unique.domains/v1/words/harbor/related" \ -H "Authorization: Bearer YOUR_MEMBER_KEY"
const response = await fetch("https://api.unique.domains/v1/words/harbor/related", {
method: "GET",
headers: {
"Authorization": "Bearer YOUR_MEMBER_KEY",
},
});
const data = await response.json();
console.log(data);import requests
response = requests.get(
"https://api.unique.domains/v1/words/harbor/related",
headers={
"Authorization": "Bearer YOUR_MEMBER_KEY",
},
)
print(response.json())req, err := http.NewRequest("GET", "https://api.unique.domains/v1/words/harbor/related", nil)
if err != nil {
panic(err)
}
req.Header.Set("Authorization", "Bearer YOUR_MEMBER_KEY")
res, err := http.DefaultClient.Do(req)$ch = curl_init();
curl_setopt_array($ch, [
CURLOPT_URL => "https://api.unique.domains/v1/words/harbor/related",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_CUSTOMREQUEST => "GET",
CURLOPT_HTTPHEADER => [
"Authorization: Bearer YOUR_MEMBER_KEY",
],
]);
$response = curl_exec($ch);uri = URI("https://api.unique.domains/v1/words/harbor/related")
request = Net::HTTP::Get.new(uri)
request["Authorization"] = "Bearer YOUR_MEMBER_KEY"
response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(request) }Response
wordstringslugstring | nullrelationstringopenNamesinteger | nullOpen to register plus for sale; null: not counted yet.
Errors
{
"data": [
{
"word": "port",
"slug": "port",
"relation": "synonym",
"openNames": 6
}
],
"meta": {
"asOf": "2026-11-05T08:00:00Z",
"cursor": null,
"limit": null
},
"links": {
"self": "https://api.unique.domains/v1/words/harbor/related",
"next": null,
"register": null,
"product": null,
"dataset": null
}
}
ChatGPT
Claude
Gemini
Grok
Perplexity