Related Keywords API
Discover semantically related keywords and variations with volume, CPC, and difficulty. Build topical authority from $0.03/call.
Discover keywords that are semantically related to your seed term. These aren't just variations — they're terms that searchers also look for, helping you build comprehensive topic coverage.
Try it live
Fill in the fields and hit Run to see a real response.
{
"ok": true,
"data": [
{
"keyword": "email automation",
"searchVolume": 8100,
"cpc": 3.2,
"difficulty": 52
},
{
"keyword": "drip campaign",
"searchVolume": 4400,
"cpc": 2.8,
"difficulty": 45
},
{
"keyword": "newsletter platform",
"searchVolume": 3600,
"cpc": 4.1,
"difficulty": 48
}
]
}Features
Use cases
Topic Cluster Building
Map the full semantic landscape around any topic to create interlinked content that search engines reward.
Internal Linking Strategy
Discover related terms across your content to build contextual internal links that boost page authority.
Content Gap Analysis
Find related topics your site hasn't covered yet — opportunities competitors are already ranking for.
Semantic SEO
Enrich your pages with semantically related terms that signal topical authority to search engines.
FAQ Generation
Identify the questions and related searches real users have, then build FAQ sections that capture featured snippets.
Quick start
Copy this snippet and start making calls.
const res = await fetch('https://api.yepapi.com/v1/seo/keywords/related', {
method: 'POST',
headers: {
'x-api-key': 'YOUR_API_KEY',
'Content-Type': 'application/json',
},
body: JSON.stringify({
"keyword": "email marketing",
"limit": 50,
"location_code": 2840,
"language": "en"
}),
});
const data = await res.json();
console.log(data);What developers say
“Switched from SerpAPI and cut our SERP costs by 80%. Same data quality, way simpler billing.”
“One API key for AI models, SERP data, and web scraping. Saved us from managing 4 separate providers.”
“The $5 free credit let us prototype our entire rank tracking feature before committing. No other API does that.”
Frequently asked questions
Discover keywords that are semantically related to your seed term. These aren't just variations — they're terms that searchers also look for, helping you build comprehensive topic coverage.
Each API call costs $0.02 (+$0.02 per 100 results). No monthly minimums or subscriptions — you only pay for what you use.
Sign up for a free API key, then send a POST request to /v1/seo/keywords/related. Check the code example above for a ready-to-use snippet in JavaScript, cURL, or Python.
YepAPI bundles SEO, AI, and web scraping APIs under one key with no monthly minimums. You get lower per-call pricing, a unified dashboard, and one billing account instead of managing multiple providers.
Ready to integrate?
Get your API key and start making calls in 30 seconds. $5 free credit on signup — no credit card required.
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