# Similarweb > 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. - Canonical: https://www.anchorterminal.com/tools/similarweb - Markdown: https://www.anchorterminal.com/tools/similarweb.md (~7,200 tokens) - Slim: https://www.anchorterminal.com/tools/similarweb.min.md (~1,780 tokens, same facts, less prose, for token-sensitive contexts) - JSON: https://www.anchorterminal.com/tools/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: 2026-10-08 ## Overview **Grade D · 46/100 · rank #566 of 629 · #5 in SEO & search visibility · not agent-ready · confidence medium** ## Assessment 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. ## Facts | Field | Value | | --- | --- | | Vendor | Similarweb Ltd. (https://www.similarweb.com) | | Kind | HTTP API | | Category | SEO & search visibility (https://www.anchorterminal.com/categories/seo) | | Transport | HTTP | | Endpoint | `https://api.similarweb.com` | | Auth | OAuth or key · A paid subscription with API access is required (Business, Enterprise or the API-only package, bought through sales). An account admin creates keys in the platform under Settings, Account. Requests carry the key in an `api-key` header. Each user can hold up to 3 active keys with no expiry, and admins can deactivate keys and cap credits per user. The MCP server also accepts OAuth through mcp-auth.similarweb.com with dynamic client registration and a single `read` scope, signed in with a Similarweb login. | | Pricing | Paid (Paid) · No public API price. API and MCP access come with Business and Enterprise plans or a standalone API package, all quoted by sales. Usage is metered in data credits that reset monthly. The FAQ says an active subscription with API access is needed to test the API, so no sandbox or free tier was found. Self-serve Web Intelligence plans start at $125 a month billed annually, and the docs say Starter and Professional plans may not include API access (checked 2026-10-08). | | x402 | No · No x402, MPP or L402 in the developer docs or on the pricing page (checked 2026-10-08). | | Licence | Proprietary service under Similarweb's terms of use | | Docs | https://docs.similarweb.com/api-v5/ | | llms.txt | https://docs.similarweb.com/api-v5/llms.txt | | Last release | 2026-09-24 | | APIs | REST API V5 at https://api.similarweb.com/v5/ (117 reference pages in the V5 index, covering website, search, app, company, Amazon, cross-retail and generative AI data). Batch API at https://api.similarweb.com/batch/v4/ for reports of up to 1 million domains. Rank Tracking API under /v4/rank-tracker/ | | MCP server | Hosted at https://mcp.similarweb.com. `api-key` header or OAuth (authorisation code with PKCE, refresh tokens, dynamic client registration, revocation endpoint, scope `read`). Vendor guides for Claude, ChatGPT, Cursor, Microsoft Copilot and Perplexity | | SEO data | Traffic and engagement (visits, bounce rate, pages per visit, visit duration, page views, unique visitors), traffic channels, referrals, geography, website rank, website keywords (clicks, traffic share, position, top URL, intent), keywords overview (volume, CPC, difficulty), SERP players and landing pages. No backlink endpoint found | | Credentials | API keys created by account admins, up to 3 active per user, no expiry, activation toggle, credit limits per user. V5 uses one key for REST and Batch | | Rate limits | REST 10 requests a second per account. Batch 20 pending requests per user. Exceeding the monthly credit allowance also returns 429 | | Errors | 401 data not found (REST) or unauthorised (Batch), 403 invalid key or no credits, 429 too many requests, 101 dates not in range, 102 granularity not supported, 103 country not available, 500 internal error (Batch). Responses carry `status`, `error_code` and `error_message` in `meta` | | Pagination | `limit` (default 100), `offset`, `sort` and `asc` on aggregated endpoints, plus `metrics`, `country`, `granularity`, `web_source`, `start_date` and `end_date` | | Data freshness | Daily data within 72 hours, monthly data by the 10th of the following month, no real-time data, per the FAQ. Each response carries `last_updated` | | Billing | Data credits, reset monthly with no rollover. 1 credit per result on most endpoints, 1 per 100 results on keyword endpoints. Price per credit is not published | | SDKs | None found. The FAQ says the API works with any HTTP client. Add-ons exist for Google Sheets, Excel and Looker Studio | | Certifications | SOC 2 Type II and ISO 27001 per https://www.similarweb.com/corp/privacy-security/ | | Status | No public status page found. similarweb.statuspage.io redirects to a login | | Capabilities | seo.traffic, seo.keywords, seo.serp, seo.rankings, lead.enrichment, data.company | | Tags | hosted, paid, sales-led, api-key, oauth, mcp, llms-txt, batch, webhooks, soc2 | | JSON | https://www.anchorterminal.com/api/v1/tools/similarweb.json | ## Score breakdown (methodology v0.4, October 2026 research run) Assessed 2026-10-08 from public evidence against the published checklist (https://www.anchorterminal.com/benchmark/#checklist). Confidence: medium. Performance and Task success pending (no score, not in the total); the total is Σ(score × weight) ÷ 80 over the 7 assessed categories. "This run" is each category's share of the 100 points. | Category | Weight | This run | Score (0–100) | Points | | --- | --- | --- | --- | --- | | Reliability | 16% | 20 | 35 | 7.0 | | Performance | 10% | pending | pending | n/a | | Schema & documentation | 13% | 16.2 | 63 | 10.2 | | Agent ergonomics | 13% | 16.2 | 67 | 10.9 | | Security & auth | 14% | 17.5 | 52 | 9.1 | | Payments & pricing | 10% | 12.5 | 5 | 0.6 | | Task success | 10% | pending | pending | n/a | | Maintenance & community | 7% | 8.8 | 33 | 2.9 | | Transparency & trust (editorial 45, provenance 75) | 7% | 8.8 | 60 | 5.2 | | Negative events | up to −15 | up to −15 | none recorded | 0 | | **Total** | | | | **46 → D** | ### Why each score - Reliability 35: Graded as a hosted service, on the V5 REST API and the hosted MCP server. No public status page found, and similarweb.statuspage.io redirects to a login (0). No readable incident history (5). Rate limits published, 10 requests a second for REST and 20 pending requests for Batch (15). 429 is documented with advice to add a rate limiter and errors aren't charged, but no Retry-After or backoff guidance was found, and Batch has a retry endpoint (5 of 15). The SLA page is dated January 2016 and its PDF returns 404 (0). V5 is announced as live and carries no beta label (10). Total 35. - Performance: Pending. Latency is measured per call by our probes, which haven't run yet, so this run doesn't score it. Its weight is shared across the assessed categories until the first probe window closes. - Schema & documentation 63: No public OpenAPI file found. Reference pages carry structured parameter and response definitions in Markdown, and the MCP tool schemas need a key to read (8 of 25). llms.txt on both docs sites with Markdown pages (10). Endpoint pages state purpose, output fields, constraints and credit cost, with little on when not to use one (12 of 20). Parameters are typed with enums for granularity and device, and defaults are stated (12 of 15). Request and response examples exist, and the error table has mismatched descriptions for codes 101 and 102 (9 of 15). Versioned paths and two changelogs, the newer one unreadable to us (12 of 15). Total 63. - Agent ergonomics 67: V5 requests name the metrics wanted and take `limit`, so responses can be sized. The MCP tool count couldn't be read without a key, and the vendor cites more than 75 endpoints (15 of 25). `limit`, `offset`, `sort` and `asc` plus country, date and granularity filters (20). Errors are a short documented table with `error_code` and `error_message` in responses, and 401 is used for data not found (10 of 20). The data endpoints are reads, so retries are safe, and the MCP scope is `read`. Tool annotations unverified (14 of 20). Only `domain` is required on the endpoints read, and no SDKs exist (8 of 15). Total 67. - Security & auth 52: Revocable API keys created by admins, with up to 3 per user, no expiry and credit caps per user, plus OAuth with PKCE and a `read` scope on the MCP server (22 of 30). Less 10 because the capabilities endpoint documents the key in a `?api_key=` query string. Data access is read-only and follows the plan's data sets and countries (14 of 20). No guidance found on untrusted content in returned URLs, keywords and app details (8 of 15). The keys table shows last use and monthly usage per key, and a credit dashboard shows usage by user (8 of 15). SOC 2 Type II and ISO 27001 stated, no security.txt, and the trust centre refused our reader (10 of 20). Total 52. - Payments & pricing 5: No x402, MPP or L402 found (0). No price per credit or API plan price is public. The credit cost per endpoint and the formula are published, which earns 5 of 20 as a departure from the checklist. No free tier or API trial, since the FAQ requires an active subscription (0). A person has to buy through sales and an admin has to create the key (0). Total 5. - Task success: Pending. Task success needs the category task suites run through each tool, which haven't run yet, so this run doesn't score it. Its weight is shared across the assessed categories until then. A data provider's data-quality score is published on its listing now and becomes half of this category when it's scored. - Maintenance & community 33: The V5 docs version shows a publish date of 24 September 2026 in the page data, and the migration guide dates the legacy endpoint deprecation at 6 October 2026. This is documentation metadata, not a changelog entry, so 20 of 30. Three dated entries in 90 days not established, because the V5 changelog didn't load (0). Two public changelogs and a help centre with ticket support (8 of 15). No official SDKs, and the official MCP registry lists only third-party Similarweb servers (0). The hosted MCP server and both docs sites are live and current (5 of 10). Total 33. - Transparency & trust 60: Closed service under public terms last updated 19 March 2025 (15 of 30). The privacy policy, amended 30 June 2026, states retention as long as reasonably necessary with no periods, and no public DPA was found (12 of 30). Deprecations carry dates, such as Demographics 1.0 on 1 January 2025 and legacy REST endpoints on 6 October 2026 with a mapping table, but no written notice policy was found (12 of 20). The privacy policy says servers are in the United States, and no sub-processor list was found on the public pages (6 of 20). Total 45. Fix list for a coding agent, everything this grade says the listing lacks, the biggest gain first (17 items): https://www.anchorterminal.com/fixes/similarweb.md (JSON https://www.anchorterminal.com/fixes/similarweb.json) ### What we couldn't check - unchecked: MCP tool definitions, tool count and annotations, which need a subscription key to list - unchecked: the V5 changelog entries at https://docs.similarweb.com/changelog/similarweb/api-v5, which load in the browser and didn't reach our reader - unchecked: https://trustcenter.similarweb.com/ answered with a bot check, so the DPA, sub-processor list and any disclosure policy there weren't read - unchecked: whether the legacy REST endpoints stopped answering on 6 October 2026 as the migration guide says - No dollar price per data credit or for the API-only package was found on public pages - The privacy and security page links bugcrowd.com in its markup with no programme named, so no bug bounty is recorded - Rank tracking endpoints appear in the V4 reference only, and no V5 replacement was found in the V5 index ### Sources - V5 docs index (llms.txt): (seen 2026-10-08) - V5 authentication: (seen 2026-10-08) - V5 first request: (seen 2026-10-08) - data credits: (seen 2026-10-08) - error codes: (seen 2026-10-08) - FAQ with rate limits, freshness, SDKs and trial: (seen 2026-10-08) - capabilities endpoint with key in query string: (seen 2026-10-08) - legacy endpoint migration and deprecation date: (seen 2026-10-08) - MCP setup and tool list: (seen 2026-10-08) - MCP Claude connector, access by plan: (seen 2026-10-08) - MCP Cursor config: (seen 2026-10-08) - MCP OAuth resource metadata: (seen 2026-10-08) - MCP OAuth server metadata: (seen 2026-10-08) - traffic and engagement reference: (seen 2026-10-08) - website keywords reference: (seen 2026-10-08) - V4 docs index with Rank Tracking API: (seen 2026-10-08) - V4 changelog: (seen 2026-10-08) - pricing: (seen 2026-10-08) - API product page: (seen 2026-10-08) - terms: (seen 2026-10-08) - privacy policy: (seen 2026-10-08) - privacy and security page: (seen 2026-10-08) - SLA page: (seen 2026-10-08) - status host redirecting to login: (seen 2026-10-08) - official MCP registry search: (seen 2026-10-08) - RDAP: (seen 2026-10-08) ## Who's behind it (provenance 75/100, checked 2026-10-08) | Check | Finding | Points | | --- | --- | --- | | Legal entity named | Similarweb Ltd. | 20/20 | | Domain age | similarweb.com, registered 2008-04-10 (18 years) | 15/15 | | Endpoint on the vendor's domain | api.similarweb.com | 15/15 | | Terms of service | read, states 6 of the 7 things a reader expects, and has 2 clauses that cost points | 5.1/10 | | Privacy policy | read, states 8 of the 8 things a reader expects | 10/10 | | Status page | not found | 0/10 | | Changelog | published | 10/10 | | security.txt | not found | 0/10 | The terms (last updated 19 March 2025) name Similarweb Ltd., 121 Menachem Begin Road, Tel Aviv, as the contracting company and DMCA agent. The privacy policy (last amended 30 June 2026) lists Similarweb Ltd. (Israel), Similarweb Inc. (Delaware) and Similarweb UK Ltd. among group companies. The API answers at api.similarweb.com and the MCP server at mcp.similarweb.com, with OAuth at mcp-auth.similarweb.com. www.similarweb.com/.well-known/security.txt returns 404. similarweb.statuspage.io redirects to a Statuspage login, so no public status page is recorded. The V5 changelog page loads its entries in the browser and we couldn't read them. The older changelog at developers.similarweb.com/changelog is readable. https://www.similarweb.com/corp/legal/sla/ is dated January 2016 and links a PDF that returns 404. RDAP for similarweb.com gives a registration date of 2008-04-10. ### Terms and privacy, as read A reading by a fixed set of rules, each answered with the vendor's own sentence. Not legal advice. **Terms of service** (https://www.similarweb.com/corp/legal/terms/), read 2026-10-08, dated 2025-03-19, states 6 of the 7 things a reader expects. - To know. Restricts automated access (costs points). "(v) use any robot, spider, scraper, or other automated means to access or monitor the Platform, Site or Applications for any purpose, or to copy, access, collect, download, or otherwise obtain data, content or other information from the Platform, Site or Applications;" - To know. Restricts benchmarking or competitive use (costs points). "(x) use the Platform, Site or Applications to develop, offer, operate, support or enable a competing service or product;" - To know. Says access can be ended without notice or for any reason. "Similarweb may terminate your Subscription to the Platform and/or Applications at any time and without prior written notice in any case where it believes that you or your Organization have breached these Terms." - Gives the date it was last updated. Last updated 2025-03-19. - Names the governing law or courts. The law of the State of Israel. - States a limit on its liability. Capped at the fees paid in the 6 months before the claim. - Says how changes to the terms are announced. Gives ten days of notice before a change. - Not found in the text. Refers to a service level or uptime commitment. - Also in the text (2026-10-08). Data received through the platform may not be presented or shared without the vendor's prior consent, and with consent it must carry attribution to the vendor. "(iv) present or share the data or information received through the Platform without Similarweb’s prior consent, and in the event such consent was given, present or share such data or information without attribution to Similarweb pursuant to Similarweb’s branding guidelines;" - Also in the text (2026-10-08). When a customer registers through a third-party account such as Google, the vendor uses analytics information about the customer's sites and apps, in aggregate, to improve its algorithms. "In that event, we will access and use some of that information, on an aggregated basis with similar information received from other organizations regarding their sites and apps, in order to improve our algorithms." - Also in the text (2026-10-08). The vendor's total liability is capped at the fees paid in the six months before the event giving rise to it. "EXCEED THE TOTAL AMOUNT OF FEES ACTUALLY PAID BY YOU (IF ANY) IN THE SIX (6) MONTHS IMMEDIATELY PRIOR TO THE EVENT GIVING RISE TO SUCH LIABILITY." **Privacy policy** (https://www.similarweb.com/corp/legal/privacy-policy/), read 2026-10-08, dated 2026-06-30, states 8 of the 8 things a reader expects. - To know. Says it sells personal data or shares it for advertising. "We sell such categories of Personal Data to our business customers so that they may conduct their own analysis on consumer behaviours and analyze and improve their marketing and advertising campaigns." - Gives the date it was last updated. Last updated 2026-06-30. - Says whether personal data is sold or shared for advertising. Says it does not sell personal data. - Gives a privacy contact. dpo@similarweb.com. - Says where data is transferred or stored. Relies on standard contractual clauses. ## Live (updated 2026-10-08 17:36 UTC) - Right now: up, HTTP 404, 159 ms, checked 2026-10-08 17:36 UTC (get on `https://api.similarweb.com`) - Uptime 24h 100.0% (25 probes) · 30 days 100.0% (25 probes) · p50 159 ms · p95 275 ms - security.txt: none - Always current: https://www.anchorterminal.com/api/v1/live/similarweb.json ## Probe metrics Not measured yet. Our benchmark probes haven't run, so there's no availability, latency or error rate from a run and Performance is pending. Live uptime, where we poll the endpoint, is under Live and doesn't change the score. ## Strengths - Hosted MCP server at https://mcp.similarweb.com accepts an `api-key` header or OAuth, with dynamic client registration and one `read` scope - V5 endpoints take a `metrics` list, so one request returns only the fields asked for, and each result costs one data credit - Keyword endpoints cost one credit per 100 results, and errors and empty responses aren't charged, per the data credits guide - Both documentation sites publish llms.txt and a Markdown copy of every page - Admins can cap credits per user and deactivate keys, and the keys table shows last use and monthly usage per key ## Weaknesses - 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 - No public status page found. similarweb.statuspage.io redirects to a Statuspage login - No public OpenAPI file or official SDK found. The FAQ answers the SDK question by saying any HTTP client works - No backlink endpoint in the V5 or V4 API reference, although the website lists a Backlink Analytics product - The SLA page is dated January 2016 and its linked PDF returns 404 ## Before you call it (notes for agents) 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 ## Connect First request: ```bash curl -G "https://api.similarweb.com/v5/website-analysis/websites/traffic-and-engagement" \ -H "api-key: $SIMILARWEB_API_KEY" \ -d "domain=nike.com" -d "metrics=visits,bounce_rate,pages_per_visit" \ -d "granularity=monthly" -d "start_date=2024-10-01" -d "end_date=2024-12-31" ``` MCP client configuration: ```json { "mcpServers": { "similarweb-traffic-mcp": { "args": [ "-y", "mcp-remote@latest", "https://mcp.similarweb.com", "--header", "api-key:YOUR_API_KEY" ], "command": "npx" } } } ``` Through letme (picks today, calling later): https://letme.dev/similarweb. letme answers with the pick and how to call it direct; calling through letme (one key, the vendor's own price) comes later. How it works: https://www.anchorterminal.com/letme/index.md ## Similar tools Ranked by shared capabilities, then score. Same-category tools with no shared capability key are listed last. | Tool | Grade | Score | Rank | Shared capabilities | x402 | Markdown | | --- | --- | --- | --- | --- | --- | --- | | Manifold | C | 56.2 | 438 | seo.keywords, seo.serp, seo.rankings, seo.traffic, lead.enrichment, data.company | no | https://www.anchorterminal.com/tools/manifold-mcp.md | | DataForSEO | B | 64.9 | 244 | seo.keywords, seo.serp, seo.rankings, seo.traffic | no | https://www.anchorterminal.com/tools/dataforseo.md | | Semrush API + MCP | D | 53.1 | 487 | seo.keywords, seo.rankings, seo.traffic, seo.serp | no | https://www.anchorterminal.com/tools/semrush.md | | Ahrefs | D | 49.8 | 526 | seo.keywords, seo.serp, seo.rankings, seo.traffic | no | https://www.anchorterminal.com/tools/ahrefs.md | | Moz API | E | 45.3 | 571 | seo.keywords, seo.serp, seo.rankings | no | https://www.anchorterminal.com/tools/moz-api.md | | Apollo API + MCP | B | 63.3 | 282 | lead.enrichment, data.company | no | https://www.anchorterminal.com/tools/apollo.md | ## Panel reviews (0) Reviewed by the Anchor panel (https://www.anchorterminal.com/reviewers/index.md): . Desk reviews, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. For a desk review, the outcome says whether the reviewer's questions could be answered from public material: success, partial or failure. How reviews work: https://www.anchorterminal.com/reviews/how-it-works.md ## Notable - Hosted MCP server at https://mcp.similarweb.com. An unauthenticated request returns 401 asking for an `api-key` header or a Bearer token, and https://mcp.similarweb.com/.well-known/oauth-protected-resource names https://mcp-auth.similarweb.com as the authorisation server with one scope, `read` - The MCP guide lists traffic and engagement, traffic sources, website rank, referrals, geography, demographics, SERP players, SERP clicks, keywords overview and website keywords among its tools, and says MCP calls spend the same data credits as API calls (source: ) - Data credits follow domains x endpoint cost x granularity x countries x periods x results. Most endpoints cost 1 credit per result and keyword endpoints 1 credit per 100 results. Errors, empty responses and `/capabilities` are free (source: ) - REST is limited to 10 requests a second per account and Batch to 20 pending requests per user. Daily data arrives within 72 hours and monthly data by the 10th of the next month (source: ) - The migration guide says the legacy REST endpoints in its mapping table are deprecated on 6 October 2026 and maps each to a V5 replacement, with some segment endpoints marked coming soon (source: ) - API access is sold with Business and Enterprise plans or as a standalone API package through sales. Self-serve Web Intelligence plans start at $125 a month billed annually (source: ) - SOC 2 Type II and ISO 27001 are stated on https://www.similarweb.com/corp/privacy-security/. www.similarweb.com/.well-known/security.txt returns 404 ## Compare - [Ahrefs vs Similarweb](https://www.anchorterminal.com/compare/ahrefs-vs-similarweb.md): D 49.8 vs D 46 - [DataForSEO vs Similarweb](https://www.anchorterminal.com/compare/dataforseo-vs-similarweb.md): B 64.9 vs D 46 - [Manifold vs Similarweb](https://www.anchorterminal.com/compare/manifold-mcp-vs-similarweb.md): C 56.2 vs D 46 - [Moz API vs Similarweb](https://www.anchorterminal.com/compare/moz-api-vs-similarweb.md): E 45.3 vs D 46 - [Semrush API + MCP vs Similarweb](https://www.anchorterminal.com/compare/semrush-vs-similarweb.md): D 53.1 vs D 46 ## Verify this listing For the vendor. The badge or a plain link to this page verifies the listing, from a page on similarweb.com or one of its subdomains. It shows the listing is the vendor's and that the vendor knows it's here, and it never changes a grade, rank or review. The vendor sends the page's address to `POST https://www.anchorterminal.com/api/v1/verify` as `{"slug": "similarweb", "url": "…"}`, or calls the `verify_listing` tool at https://www.anchorterminal.com/mcp. We fetch the page once, then again every week; two failed checks in a row and the verification lapses, and a later pass restores it. What we check: https://www.anchorterminal.com/builders/index.md#verify HTML badge: ```html Similarweb on Anchor Terminal ``` Markdown badge, for a README: ```markdown [![Similarweb on Anchor Terminal](https://www.anchorterminal.com/badges/similarweb.svg)](https://www.anchorterminal.com/tools/similarweb) ``` Plain link: ```html Similarweb on Anchor Terminal ``` ## Share this listing For the vendor. Sharing assets for social media, two PNGs of 1200 × 630 that say Similarweb is listed on Anchor Terminal, with the vendor's logo and this page's address and no grade or score. - Dark: https://www.anchorterminal.com/assets/share/similarweb-dark.png - Light: https://www.anchorterminal.com/assets/share/similarweb-light.png