Adoption
How many of the sites we check register WebMCP tools, as of Nov 6, 2026.
780of the 111,972 sites we check use WebMCP.
179 of them are Shopify stores with the tools Shopify adds to every store, and 601 are other sites.
Every site we check
What we found on each one. The sites we couldn't read stay in the count.
| Result | Sites | Share |
|---|---|---|
| Use WebMCPRegisters at least one tool | 780 | 0.7% |
| No tools foundLoaded, with no WebMCP tools | 69,024 | 61.6% |
| Blocked usAnswered 401, 403 or 429 | 8,103 | 7.2% |
| Unreachable or not a websiteTimed out, failed, or the name doesn't resolve | 18,659 | 16.7% |
| SkippedUnsafe, redirected away, a shared app host, or its robots.txt names our bot | 15,406 | 13.8% |
Adoption by popularity
How many of the web's most popular sites use WebMCP, by rank on the Tranco list. We count only the sites we could read, and a group shows once we've checked most of it.
- Top 1,000 sites1.2%6 of the 482 we could read use WebMCP
- Top 10,000 sites0.52%27 of the 5,214 we could read use WebMCP
- Top 100,000 sites0.41%242 of the 59,676 we could read use WebMCP
By list and tag
How many YC companies and sites in each category use WebMCP, counting only the sites we could read. YC companies come from YC's directory, and categories from YC's and Wikidata's own labels.
- YC company0.89%39 of the 4,371 we could read use WebMCP
- AI1.1%30 of the 2,685 we could read use WebMCP
- SaaS0.75%8 of the 1,070 we could read use WebMCP
- Devtool1.9%8 of the 429 we could read use WebMCP
- Fintech0.96%11 of the 1,151 we could read use WebMCP
- E-commerce1%2 of the 196 we could read use WebMCP
- Security2.1%10 of the 466 we could read use WebMCP
- Health0.69%4 of the 579 we could read use WebMCP
How sites register tools
Every tool on a listed site, by how the page registers it.
- document.modelContext4,80785.9%
- navigator.modelContext62911.2%
- Declarative forms1622.9%
Tools per site
Listed sites by how many tools they register. The last bar gathers the long tail.
How we measure
We check the most popular sites on the Tranco list, plus every site submitted to us or found in public lists of WebMCP sites. We skip anything on The Block List Project's lists, shared app hosts, and sites whose robots.txt names our bot. Then we read each homepage and a few of its scripts for signs of WebMCP, and load every site that has them in a real browser, the same check a submitted site gets.
We look at homepages first, so tools that only appear deeper in a site or after sign-in are missed. These numbers undercount adoption.