Category · Web, data & documents
SEO and search visibility data for AI agents
Data about how websites rank and are found. Keywords and search volumes, backlinks, ranking positions and traffic estimates, through an API or an MCP server. Compared on the data sets covered, how fresh they are, price per request and limits.
Capability keys seo.keywords · seo.backlinks · seo.serp · seo.rankings · seo.traffic · All tools
letme.dev/seo.keywords picks the top-graded tool in this list and says how to call it direct; calling through letme comes later.
The same listing from the live API. Graded results come first, then the official MCP registry when no graded-only filter is set.
https://www.anchorterminal.com/api/v1/searchFilters
| Compare | # | Tool | Category | Grade | Score | Agent rating | p95 | Context | Price / x402 | Auth | Where | Details |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 219 | DataForSEODataForSEO OÜ · HTTP API | SEO | B | 64.9 | none | n/a | n/a | $0.60 / 1k req | OAuth or key | Hosted + local | ||
|
SEO data API from DataForSEO OÜ in Estonia. It returns search results pages, keyword volumes, backlinks, ranked keywords and traffic estimates as JSON, billed per request from a prepaid balance, with an official MCP server. Top strength Per-request prices published for every API, from $0.0006 a results page in the standard queue, with the cost returned in each response Top weakness The REST API takes one account-wide login and password over HTTP Basic, with no scopes or read-only credential |
||||||||||||
| 397 | ManifoldManifold (Jesse Sibley, sole trader) · MCP server | SEO | C | 56.2 | none | n/a | n/a | $20 / mo | OAuth or key | Hosted | ||
|
Manifold is a hosted MCP server of read-only marketing data tools covering SEO keywords, rankings, backlinks and site audits, plus AI answers, lead data, ad libraries and social platforms. It launched in September 2026 and is sold on prepaid credits. Top strength All 79 documented tools are read-only, and each description states when to use it, when not to, what it returns and what it costs Top weakness Two weeks old on 8 October 2026. The domain was registered on 21 September and the registry entry published on 27 September 2026 |
||||||||||||
| 441 | Semrush API + MCPSemrush Inc. (an Adobe company) · HTTP API | SEO | D | 53.1 | none | n/a | n/a | Paid | OAuth or key | Hosted | ||
|
Semrush is a search marketing data platform, owned by Adobe since April 2026. Agents reach its keyword, backlink, ranking and traffic data through REST APIs with API keys or a hosted MCP server that spends the same API units. Top strength Hosted MCP server at mcp.semrush.com/v2/mcp with OAuth 2.1, dynamic client registration and 14 named tools, limited to reads Top weakness Domain, URL, Trends, Position Tracking and Site Audit reports are version 3 only, where the one key is a URL parameter and can't be revoked |
||||||||||||
| 478 | AhrefsAhrefs Pte. Ltd. · HTTP API | SEO | D | 49.8 | none | n/a | n/a | $129 / mo | OAuth or key | Hosted | ||
|
Ahrefs is an SEO data platform covering backlinks, keywords, search results, rank tracking, site audits and traffic estimates. Outside agents reach it through the REST API v3 with an API key, or through a hosted MCP server. Top strength Public OpenAPI 3.2.0 description of all 153 operations, per-tool specs, llms.txt and Markdown copies of every guide Top weakness No public status page, incident history or SLA found. status.ahrefs.com returns 404 |
||||||||||||
| 516 | SimilarwebSimilarweb Ltd. · HTTP API | SEO | D | 46 | none | n/a | n/a | Paid | OAuth or key | Hosted | ||
|
Similarweb estimates website and app traffic from panel and other data sources. Its REST and Batch APIs and a hosted MCP server return visits, engagement, traffic channels, keywords and SERP data for a domain, under a paid subscription. Top strength Hosted MCP server at https://mcp.similarweb.com accepts an Top weakness 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 |
||||||||||||
| 521 | Moz APISEOmoz, Inc. · HTTP API | SEO | E | 45.3 | none | n/a | n/a | $20 / mo | API key | Hosted | ||
|
Moz API is a hosted JSON-RPC 2.0 service for SEO data from Moz's link and keyword indexes. It returns Domain Authority, backlinks, keyword metrics, ranking keywords and search results, with a beta MCP server for AI clients. Top strength Error reference lists 13 codes, each with HTTP status, a machine-readable Top weakness No working public status page was found, and moz.statuspage.io reports the Moz Status page as inactive |
||||||||||||
Nothing matches these filters. .
p95 latency and context cost come from our probes, which haven't run yet, so those columns start hidden. Grades run from AA to F, and agent-ready means BB or better. Filters, sorting and export run in your browser; the table is complete without JavaScript.
How we test this category
The same ten domains and fifty keywords asked of each listing (search volume, ranking position, backlink count, referring domains and a traffic estimate). We check coverage, the date of each figure, agreement between listings and the cost of the run. In this run listings are graded from public evidence against the published checklist. This test hasn't run yet, so Task success is pending and the grades here come from the categories assessed from public evidence.
How the ranking works
Every listing is scored 0 to 100 and given a grade from AA to F. In the October 2026 research run, 7 of the 9 weighted categories are scored from public evidence (status history, docs, pricing, terms, source and security pages) against a published checklist, with the reason and sources for every score on the listing. Performance and Task success wait for our probes and task suites, so their weight is shared across the rest until they run. Negative events deduct up to 15 points. Read the methodology.
For companies
Do agents find, use and choose your tools?
An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.