# Keywords Everywhere API + MCP vs Similarweb

> Keywords Everywhere scores 47.2 (D) to Similarweb's 46 (D) for keyword data. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/keywords-everywhere-vs-similarweb
- Markdown: https://www.anchorterminal.com/compare/keywords-everywhere-vs-similarweb.md (~2,550 tokens)
- Slim: https://www.anchorterminal.com/compare/keywords-everywhere-vs-similarweb.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/keywords-everywhere-vs-similarweb.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

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.

- Keywords Everywhere API + MCP: grade D, 47.2/100, rank #836 of 950. Markdown https://www.anchorterminal.com/tools/keywords-everywhere.md · JSON https://www.anchorterminal.com/api/v1/tools/keywords-everywhere.json
- Similarweb: grade D, 46/100, rank #858 of 950. Markdown https://www.anchorterminal.com/tools/similarweb.md · JSON https://www.anchorterminal.com/api/v1/tools/similarweb.json
- Best SEO and search visibility data for AI agents: https://www.anchorterminal.com/best/seo/index.md
- All 45 seo comparisons: https://www.anchorterminal.com/compare/seo/index.md

## 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

| Category | Weight | Keywords Everywhere API + MCP | Similarweb | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 42 | 35 | Keywords Everywhere API + MCP +7 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 48 | 63 | Similarweb +15 |
| Agent ergonomics | 13% (16.2 this run) | 54 | 67 | Similarweb +13 |
| Security & auth | 14% (17.5 this run) | 47 | 52 | Similarweb +5 |
| Payments & pricing | 10% (12.5 this run) | 20 | 5 | Keywords Everywhere API + MCP +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 63 | 33 | Keywords Everywhere API + MCP +30 |
| Transparency & trust | 7% (8.8 this run) | 68 | 60 | Keywords Everywhere API + MCP +8 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **47.2 · D** | **46 · D** | |

## Facts side by side

| Fact | Keywords Everywhere API + MCP | Similarweb |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Keywords Everywhere (Axeman Technology Solutions LLP) | Similarweb Ltd. |
| Hosted endpoint | `https://api.keywordseverywhere.com` | `https://api.similarweb.com` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Paid | Paid |
| Price for keyword data | $0.0008 per record | not published |
| x402 | no | no |
| Licence | Proprietary service under the Keywords Everywhere Terms of Service. The vendor's n8n community node on npm is MIT | Proprietary service under Similarweb's terms of use |
| Tools exposed | 14 | none |
| Read-only variant documented | yes | no |
| llms.txt | no | yes |
| MCP registry | `com.keywordseverywhere/keywords-everywhere` | not listed |
| Last release | 2026-09-10 | 2026-09-24 |
| Terms last updated | 2023-05-30 | 2025-03-19 |
| Privacy policy last updated | 2025-08-15 | 2026-06-30 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 7 npm/wk | none |

## 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.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/keywords-everywhere-vs-similarweb.json, and with the fewest tokens: https://www.anchorterminal.com/compare/keywords-everywhere-vs-similarweb.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "keywords-everywhere", "b": "similarweb"}`. From a terminal: `anchor compare keywords-everywhere similarweb`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/keywords-everywhere.json and https://www.anchorterminal.com/api/v1/tools/similarweb.json

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