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UnifAPI pricing and alternatives: related keywords API, POST /seo/keywords/ideas

UnifAPI's sitellms.txtBest related keywords API in 2026: pricing comparedUnifAPI: related keywords API alternatives

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100% complete: all 6 key fields we checkSee the 6 fields
$1.00per 1,000 keywordsHalf of the 72 plans we rank by price cost $0.80 per 1,000 keywords or less. This plan is cheaper than 25% of the 72 plans.Mangools's $15 monthly plan is the cheapest paid plan per 1,000 keywords: $0.0001. Mangools charges for each page of results. We count 10,000 keywords on each page to get the $0.0001 price.Mangools, DataForSEO and SE Ranking are the best related keywords API providers in our benchmark.
Plan: Pay-as-you-go one of UnifAPI's 3 plans
Call: POST /seo/keywords/ideas one of UnifAPI's 3 calls for this API
API: Related keywords API one of UnifAPI's 68 APIs

About this item

  • Freshness. We don't know how fresh this plan's data is.
  • All 6 key fields we check. Search volume, Monthly trend, Cost per click, Competition, Keyword difficulty, Search intent.
  • A balance you top up. You pay any amount. You spend the whole balance on calls.
  • One call. You send keywords to POST /seo/keywords/ideas. The call returns keywords like each one you send.
  • Anyone can get it. Keep data: no limit. Use data: with conditions.

UnifAPI: related keywords API alternatives

We list other providers' plans closest to this plan in price per 1,000 keywords.

This planUnifAPI, top-up, Pay-as-you-go, POST /seo/keywords/ideasAhrefs, $129 monthly, Lite, GET /v3/keywords-explorer/related-terms, Related termsKeywords Everywhere, $168 yearly, Silver, POST /v1/get_related_keywordsSpyFu, $119 monthly, Pro + AI, GET /apis/keyword_api/v2/related/getAlsoBuysAdsForKeywordsMoz, $500 monthly
$ per 1,000 keywords$1.00$0.645$0.84$1.00$1.00
Completeness100%50%0%67%0%
Billingpay firstmonthlyyearlymonthlymonthly
Payany amount$129$168$119$500
Enough foras many as you pay for200,000 results a month200,000 results a year40,000 results a month500,000 results a month
Freshnessunknownunknownunknown1 monthunknown
Who can get itanyoneanyone with an Ahrefs account, only workspace owners and admins create API keysanyone 13 or over with a Keywords Everywhere accountanyoneanyone

Every related keywords API provider we score, ranked

Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-01.

  1. api.unifapi.com/openapi.json
  2. docs.unifapi.com/api/seo/keywords/ideas/post
  3. docs.unifapi.com/rate-limits
  4. unifapi.com/apis/linkedin
  5. unifapi.com/apis/seo/keywords/ideas/post
  6. unifapi.com/legal/acceptable-use-policy
  7. unifapi.com/legal/terms-of-service
  8. unifapi.com/pricing
  9. unifapi.com/pricing.md

Product details

The key fields this plan's answer can hold, then each filled column in its row on the sheet.

  • Search volume
  • Monthly trend
  • Cost per click
  • Competition
  • Keyword difficulty
  • Search intent
Price
$ per 1,000 keywords$1.00
Perresult
Billingpay first
Charges
Also pays forfrom the same budget: 324 other calls
Not found
$ per 1,000$50.00
In their words
Their pitchExpand seed keywords into related search terms that fall into the same product or service categories, each with search volume, CPC, competition, keyword difficulty, and search intent for SEO and content research.
Data
Keep datano limit
Use dataYou agree not to use our services for any unlawful purpose or in any way that could damage, disable, or impair the service. Prohibited activities include but are not limited to: Violating any applicable laws or regulations, Infringing on intellectual property rights, Transmitting malicious code or harmful content, Attempting to gain unauthorized access to systems, Interfering with or disrupting the service. [...] You may not use our services to: [...] Send unsolicited bulk messages (spam) [...] Circumvent any access controls or usage limits [...]. Public data has different legal postures depending on jurisdiction and platform. We provide the technical access, you're responsible for downstream use.
Plan
Expiresnever
Rate limit
Per second1
Batch200
The call
You sendkeywords. Optional: location, language, limit, offset, offset_token, closely_variants, ignore_synonyms, include_serp_info, view
MethodPOST
Path/seo/keywords/ideas
About the plan
PlanPay-as-you-go
Who can get itanyone
The 24 fields the plan's answer can hold

seed keywords, location, language, view, total results, offset, offset token, keyword, search volume, CPC, competition, competition level, keyword difficulty, search intent, alternative search intents, low top of page bid, high top of page bid, words count, detected language, search volume trend, SERP item types, SERP results count, monthly searches, last updated at

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