mcpbeat Sign in

Onto MCP Server

by ravixalgorithm Your server? Claim it
answering

Onto is answering right now. Last checked 4 min ago. 77 installs a week from npm. Last commit 5 Sep 2026.

Clean Markdown and AI-readability scoring for any URL. Built for AI agents.

Installs per day peak 33 · avg 6 · +166% w/w
a month agotoday
Uptime history 59 days of history · worst day 91%
59 days agonow
100.0%
Uptime 24h
91 of 91 checks
—
Tools
hidden behind auth
299 ms
Response time
average over 24h
77
Installs / week
npm and PyPI

Nothing serious here today

Today is the operative word: we check Onto every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

run in your terminal
claude mcp add onto --transport http https://api.buildonto.dev/mcp
Settings → Connectors → Add custom connector, then paste this address
https://api.buildonto.dev/mcp
~/.codex/config.toml
[mcp_servers.onto]
url = "https://api.buildonto.dev/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "onto": {
      "url": "https://api.buildonto.dev/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "onto": {
      "type": "http",
      "url": "https://api.buildonto.dev/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.

Endpoints

URLTransportStateLatencyChecked
https://api.buildonto.dev/mcp streamable-http sign-in 254 ms 4 min ago

Alternatives to Onto

same job, measured the same way
Fastcrawl
by fastcrawl

Cloud scraping & crawling API for AI agents. Turn any URL into clean, LLM-ready markdown.

answering
Scrapi
by bamchi

Web scraping for AI agents. Converts URLs to clean, LLM-ready Markdown with anti-bot bypass.

35 installs/wk 5 tools answering
Fetchgate
by fetchgate

Fetch any URL as clean Markdown or metadata, and buy digital goods via x402 — for AI agents.

10 tools answering
X
X1-BaaS Scraping API
by tazpal

Stealth scraping API for AI agents. Clean Markdown from any URL. x402 crypto payments.

3 tools answering
Web2MD MCP Server
by astra-intelligence

Convert any public URL to clean, readable Markdown for AI agents. Strips ads, navigation, and boi...

local only
AgentRead
by workers-toolschemaforge-agent-read

Turn URLs, PDFs and DOCX into clean Markdown for agents, plus prompt-injection scanning

2 tools answering
Clean Markdown
by damonwill78-a11y

Any URL to clean, LLM-ready Markdown for RAG. Strips ads, nav, and boilerplate.

57 installs/wk local only
Octocrawl
by 77777r7

Pages, crawls and URL batches as clean Markdown and JSON for AI agents, with an Evidence Record.

139 installs/wk 2 tools answering

Onto — questions

Answers built from our own checks of this server.

Why is there no tool list for Onto?
The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 100.0% of checks in the last 24 hours got a reply.
Is Onto working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 299 ms. The bar chart above shows every period we have measured.
How do I connect Onto?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You sign in through your browser once and the client keeps the session: no key to copy, and it refuses anonymous clients.
How do you sign in to Onto?
No API key is involved. Onto answers our knock with an OAuth challenge, so you authorise it once in your browser and the client keeps the session. That is also why we see no tool list: it will not describe itself to an anonymous client, and that is the server working as intended, not a fault.
How fast is Onto?
It answers our handshake in 299 ms on average, which is faster than 48% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
How many people use Onto?
The npm package @ontosdk/mcp was installed 77 times in the last week. Week over week that is +166%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is Onto open source?
The code is open source: it is published under the MIT licence, written in TypeScript and 1 stars on GitHub. The licence covers the code in the repository, not the hosted service at api.buildonto.dev, which runs on its operator's own terms.