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Head to head · Keyword data · October 2026 research run

Keywords Everywhere API + MCP vs Similarweb

Keywords Everywhere API + MCP scores 47.2 (D) on agent readiness against Similarweb's 46 (D), and leads in 4 of 7 scored categories. Similarweb leads on schema & documentation, agent ergonomics and security & auth. Both do keyword data.

Best SEO and search visibility data for AI agents · All 45 seo comparisons

Keywords Everywhere API + MCPKeywords Everywhere (Axeman Technology Solutions LLP) · HTTP API D47.2/100#836 of 950 SimilarwebSimilarweb Ltd. · HTTP API D46/100#858 of 950

Which one, for what

Keywords Everywhere API + MCP D

Good for An agent that needs Google Keyword Planner volume, CPC and competition for lists of keywords at a low price per keyword, plus keyword ideas and a quick view of a site's ranking keywords, traffic estimate and top backlinks.

Ahead on

  • Reliability, 42 against 35
  • Payments & pricing, 20 against 5
  • Maintenance & community, 63 against 33
  • Transparency & trust, 68 against 60

Watch for

No free credits or trial. Data calls need an annual plan, from $84 for 100,000 credits that expire after a year

Similarweb D

Good for Traffic and engagement estimates, traffic channel mix and keyword click data for domains an agent doesn't own, with app, company and retail data on the same key.

Ahead on

  • Schema & documentation, 63 against 48
  • Agent ergonomics, 67 against 54
  • Security & auth, 52 against 47

Watch for

API and MCP access need a Business, Enterprise or API-only plan bought through sales. The FAQ says there's no API test without a subscription

Score by category

CategoryWeight this runKeywords Everywhere API + MCPSimilarwebEdge
Reliability16%204235Keywords Everywhere API + MCP +7
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.24863Similarweb +15
Agent ergonomics13%16.25467Similarweb +13
Security & auth14%17.54752Similarweb +5
Payments & pricing10%12.5205Keywords Everywhere API + MCP +15
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86333Keywords Everywhere API + MCP +30
Transparency & trust7%8.86860Keywords Everywhere API + MCP +8
Negative events≤1500
Total47.2 · D46 · D

Facts side by side

FactKeywords Everywhere API + MCPSimilarweb
KindHTTP APIHTTP API
VendorKeywords Everywhere (Axeman Technology Solutions LLP)Similarweb Ltd.
Hosted endpointhttps://api.keywordseverywhere.comhttps://api.similarweb.com
TransportsHTTP, Streamable HTTPHTTP
AuthOAuth or keyOAuth or key
PricingPaidPaid
Price for keyword data$0.0008 per recordnot published
x402nono
LicenceProprietary service under the Keywords Everywhere Terms of Service. The vendor's n8n community node on npm is MITProprietary service under Similarweb's terms of use
Tools exposed14none
Read-only variant documentedyesno
llms.txtnoyes
MCP registrycom.keywordseverywhere/keywords-everywherenot listed
Last release2026-09-102026-09-24
Terms last updated2023-05-302025-03-19
Privacy policy last updated2025-08-152026-06-30
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessnot found in the textyes
Terms restrict benchmarkingnot found in the textyes
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waivernot found in the textnot found in the text
Popularity7 npm/wknone

Verdicts

Keywords Everywhere API + MCP

Fourteen read-only lookups with a published credit cost each, available over REST and a hosted MCP server listed in the official registry. Data needs an annual plan from $84, with no trial. No OpenAPI file, no REST rate limit and no API changelog were found, and the status page shows outages on seven of the last 90 days.

Similarweb

The V5 API returns traffic estimates, keyword clicks and SERP positions with selectable metrics, and the hosted MCP server accepts OAuth with a read scope. Access needs a Business, Enterprise or API-only subscription sold through sales, with no API trial, public price per credit or public status page found.

Before you call either

Keywords Everywhere API + MCP

  1. Send the key as Authorization: Bearer <key> to https://api.keywordseverywhere.com/v1. The same key works on the MCP server
  2. Call GET /v1/account/credits (free) before a large pull. A short balance returns 402 with 402 Insufficient Credits
  3. Set num on domain, URL and backlink lookups. It accepts 1 to 10,000 and every returned row is charged 1, 2 or 5 credits
  4. Batch up to 100 keywords in one get_keyword_data call and set country. Without it the figures are global
  5. Keep MCP use under 120 tool calls a minute per account, and wait a minute after a Too many requests error

Similarweb

  1. Send the key in the api-key header. The capabilities endpoint documents ?api_key= in the URL, which puts the secret in logs
  2. Stay under 10 requests a second. A 429 can also mean the monthly credit allowance is spent, so call /capabilities (free) before retrying
  3. Pass domains in lower case without www. or a path. The docs list 401 as data not found for a malformed domain
  4. Request only the metrics, countries and months needed. Credits multiply across domains, metrics, countries and periods, and daily granularity costs about 30 times monthly
  5. Website keywords accept monthly granularity for the last three months only, and position isn't returned for worldwide

Questions

Which is better for AI agents, Keywords Everywhere API + MCP or Similarweb?

Keywords Everywhere API + MCP scores 47.2 (D) on agent readiness against Similarweb's 46 (D), and leads in 4 of 7 scored categories. Similarweb leads on schema & documentation, agent ergonomics and security & auth.

Do Keywords Everywhere API + MCP and Similarweb need an API key?

Both take an API key or an OAuth sign-in.

Can an agent call Keywords Everywhere API + MCP and Similarweb without installing anything?

Yes. Keywords Everywhere API + MCP has a hosted endpoint at https://api.keywordseverywhere.com and Similarweb at https://api.similarweb.com.

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