web3ctx MCP Server

by farseensh Your server? Claim it

not responding

web3ctx is listed as active in the registry but did not answer our last check. It exposes 5 tools. Last commit 21 Sep 2026.

Version-true web3 docs, ABIs and human-validated integration recipes over MCP.

Uptime history 23 days of history · worst day 88%

23 days agonow

95.6%

Uptime 24h

87 of 91 checks

Tools

read from the server

201 ms

Response time

average over 24h

Stars

last commit 21 Sep 2026

What changed 2

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 16 September 2026. No other catalogue keeps this.

16 Sep a tool description was rewritten web3_fetch

16 Sep a tool changed the parameters it asks for web3_fetch

web3ctx does not always answer

Over the last week it answered 98.4% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 3 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add web3ctx --transport http https://mcp.scarai.xyz/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "web3ctx": {
      "url": "https://mcp.scarai.xyz/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.web3ctx]
url = "https://mcp.scarai.xyz/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "web3ctx": {
      "url": "https://mcp.scarai.xyz/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "web3ctx": {
      "url": "https://mcp.scarai.xyz/mcp"
    }
  }
}

Available tools 5

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

web3

web3_deps

Dependency closure around a selector. Does not follow calls across projects.

web3_fetch

Full bodies for selectors you already chose, or the next page of a cursor. Does not discover selectors.

web3_grep

Exact lexical match on a known identifier. Does not rank semantically.

web3_lookup

Typed records by id: address, ABI, EIP. Does not search prose or rank.

web3_search

Ranked selectors for a prose query or unknown identifier. Does not return bodies.

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.scarai.xyz/mcp	streamable-http	answering	8045 ms	3 min ago

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web3ctx — questions

Answers built from our own checks of this server.

What can web3ctx do?

It exposes 5 tools, read directly from the server on our last check. Among them: web3_deps, web3_fetch, web3_grep, web3_lookup, web3_search. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is web3ctx working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 87 of 91 checks got a reply (95.6%), average response time 201 ms. The bar chart above shows every period we have measured.

The registry lists web3ctx as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

How do I connect web3ctx?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does web3ctx need an API key?

No. web3ctx completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 5 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is web3ctx?

It answers our handshake in 201 ms on average, which is faster than 72% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is web3ctx open source?

Yes — it is published under the MIT licence, written in HTML and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.