Pricing, limits, and integration
SimilarWeb meters both its REST API and its MCP server with the same data credits, so there is no free agent tier: you need a subscription with API access and an API key, and every call spends credits. Web-intelligence self-service plans start at $125/month billed annually, but serious API and MCP volume sits on Business and Enterprise contracts that are quote-only.
For an agent build, plan around the shared credit pool: the MCP server and the v5 REST API draw from the same allowance, so heavy automated querying burns credits quickly. If you only need occasional competitor or market lookups, the credit model is fine; for continuous monitoring, price the enterprise tier before committing.
How much does the SimilarWeb API actually cost?
SimilarWeb publishes an API, but per-tier gating wasn't extracted automatically.
- Most likely scenario: API access is either included in all paid plans, or it's gated to higher tiers and we need to verify on the live docs page.
- Until verified, treat the question "which plan unlocks the API" as open. Don't budget on the assumption it's free with the cheapest paid plan.
API at a glance
Which AI clients can read SimilarWeb data?
Not every AI assistant supports MCP natively. Here's the per-client picture for SimilarWeb specifically.
| Client | Support | Notes |
|---|---|---|
| Claude (Desktop/Web) | Native MCP | Connect the official SimilarWeb MCP server; requires a subscription with API access and an API key. |
| Cursor | Native MCP | Documented as a supported client for the official MCP server. |
| n8n | Via connectors | Works through automation connectors (also Zapier); calls consume data credits. |
SimilarWeb also has an MCP server
If you're wiring SimilarWeb into Claude / Cursor / Codex, the MCP server is usually less code than the REST API.
See SimilarWeb MCP pageWhat you can build with the SimilarWeb API
Three personas, three different shapes of build. Pick the row that matches how you actually ship.
Glue SimilarWeb into your daily workflow
- Pull a digest of ranking changes into your morning Slack
- Trigger a one-off backfill when something looks off
- Pipe data into your own SQLite for ad-hoc queries
Sell SimilarWeb reporting at scale
- White-label SimilarWeb data into client-branded dashboards
- Run scheduled multi-account reports without logging into the SimilarWeb UI
- Cross-reference with the rest of the client's stack (CRM, analytics, ad spend)
Production pipelines for SimilarWeb
- Real-time sync into your warehouse on a cron
- Custom alerts the dashboard's built-in alerting can't express
- Backfill + idempotency handling for SimilarWeb data older than the dashboard exposes
Quickstart template
# Starter template — endpoint paths and SDK package names come from # the SimilarWeb API docs: https://developers.similarweb.com curl -X GET "https://developers.similarweb.com/<your-endpoint>" \ -H "Authorization: Bearer $TOKEN" \ -H "Accept: application/json" | jq .
Template only. Endpoint paths, exact base URL, and auth header format come from developers.similarweb.com.
Limits and gotchas
- No OpenAPI spec — you write typed clients by hand or use a third-party generator on the docs HTML.
- No official SDK detected. Plan on hitting the API directly with your HTTP client of choice.
- Rate limits: always read the docs page before scaling — the published limit is usually lower than the practical one and overages can be expensive.
Agent-readiness verdict
A documented, credit-based REST API (v5) with genuine market and traffic data, authenticated by API key and gated to paid plans. It scores a 7 out of 10: solid and well-documented, but metered by data credits and priced for enterprise, so casual programmatic use gets costly.
Partial agent-fit with official MCP support. SimilarWeb offers an official MCP server and documented public API, giving it a foundation for agent workflows, but lacks OpenAPI specs, SDKs, and structured outputs that would make integration seamless. The missing webhook and native LLM integrations mean you'll need custom parsing logic to extract and act on competitive intelligence data.
SimilarWeb API FAQ
Does SimilarWeb have a public API?+
Should I use the API or the MCP server for Claude / Cursor / Codex?+
Sources
- SimilarWeb official site: https://www.similarweb.com/
- API docs: https://developers.similarweb.com
- MCP server: https://www.similarweb.com/corp/ai/mcp/
- Pricing source: https://www.similarweb.com/corp/pricing/ (verified 2026-06-07)
10+ years in digital marketing. I review marketing software for AI-stack fit: real pricing, MCP and API support, and how cleanly each tool drops into an AI agent workflow, cross-checked against verified data and real user feedback.