# SE Ranking API + MCP vs Similarweb

> SE Ranking API + MCP scores 50.9 (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 seo keywords. Category scores, facts, verdicts and agent notes…

- Canonical: https://www.anchorterminal.com/compare/se-ranking-vs-similarweb
- Markdown: https://www.anchorterminal.com/compare/se-ranking-vs-similarweb.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/se-ranking-vs-similarweb.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/se-ranking-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

SE Ranking API + MCP scores 50.9 (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 seo keywords.

- SE Ranking API + MCP: grade D, 50.9/100, rank #681 of 842. Markdown https://www.anchorterminal.com/tools/se-ranking.md · JSON https://www.anchorterminal.com/api/v1/tools/se-ranking.json
- Similarweb: grade D, 46/100, rank #762 of 842. Markdown https://www.anchorterminal.com/tools/similarweb.md · JSON https://www.anchorterminal.com/api/v1/tools/similarweb.json

## Which one, for what

### SE Ranking API + MCP (D)

Good for: An agent that needs keyword, backlink, domain and AI search visibility data at a published price per call, or that manages rank tracking projects for an SE Ranking customer.

Ahead on:
- Reliability, 51 against 35
- Payments & pricing, 40 against 5
- Maintenance & community, 79 against 33
- Transparency & trust, 71 against 60

Watch for: No scoped or read-only keys. The MCP docs say a key has the same access as the account, including Project API deletes

### 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 58
- Agent ergonomics, 67 against 58
- Security & auth, 52 against 21

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 | SE Ranking API + MCP | Similarweb | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 51 | 35 | SE Ranking API + MCP +16 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 58 | 63 | Similarweb +5 |
| Agent ergonomics | 13% (16.2 this run) | 58 | 67 | Similarweb +9 |
| Security & auth | 14% (17.5 this run) | 21 | 52 | Similarweb +31 |
| Payments & pricing | 10% (12.5 this run) | 40 | 5 | SE Ranking API + MCP +35 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 79 | 33 | SE Ranking API + MCP +46 |
| Transparency & trust | 7% (8.8 this run) | 71 | 60 | SE Ranking API + MCP +11 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **50.9 · D** | **46 · D** | |

## Facts side by side

| Fact | SE Ranking API + MCP | Similarweb |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | SE Ranking (SER Acquisition Inc.) | Similarweb Ltd. |
| Hosted endpoint | `https://api.seranking.com` | `https://api.similarweb.com` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Pay per use | Paid |
| Price for seo keywords | $0.002 per record | not published |
| x402 | no | no |
| Licence | Proprietary service under the SE Ranking API Terms of Service. The OpenAPI file and the Claude skills on GitHub are MIT | Proprietary service under Similarweb's terms of use |
| Read-only variant documented | yes | no |
| llms.txt | no | yes |
| MCP registry | `com.seranking/mcp` | not listed |
| Last release | 2026-09-28 | 2026-09-24 |
| Terms last updated | no date given | 2025-03-19 |
| Privacy policy last updated | 2026-06-25 | 2026-06-30 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | yes | yes |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 0 stars | none |

## Verdicts

**SE Ranking API + MCP.** Every Data API endpoint has a published credit cost, credits sell from $50 for 250,000 with no expiry, and a 14-day trial needs no card. Keys carry full account access with no scopes or read-only mode, the key may travel in the URL, and no security page, SLA or llms.txt was found.

**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

### SE Ranking API + MCP

1. Send the key as `Authorization: Token <key>`, not `Bearer` and not `?apikey=`, so it stays out of URLs and logs
2. Call `GET /v1/account/subscription` (0 credits) and read `units_left` before a large pull. A short balance returns `Insufficient funds`
3. Set `limit` and `cols` on per-record endpoints. Backlink summaries cost 100 credits a target and keyword rows 10 credits each
4. Stay under 10 requests a second on the Data API and 5 on the Project API per key. Repeated overruns block the Project API for 10 minutes
5. Ask the owner before any Project API or `PROJECT_*` create, update or delete call. The key has no read-only mode and nothing confirms a delete

### 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, SE Ranking API + MCP or Similarweb?

SE Ranking API + MCP scores 50.9 (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 SE Ranking API + MCP and Similarweb need an API key?

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

### Can an agent call SE Ranking API + MCP and Similarweb without installing anything?

Yes. SE Ranking API + MCP has a hosted endpoint at https://api.seranking.com and Similarweb at https://api.similarweb.com.


## For agents

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

## Other comparisons with SE Ranking API + MCP or Similarweb

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- [Ahrefs vs Similarweb](https://www.anchorterminal.com/compare/ahrefs-vs-similarweb.md)
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