Canonicalhash MCP Server

by mlartab2 Your server? Claim it

answering

Canonicalhash is answering right now. Last checked 8 min ago. It exposes 5 tools.

Deterministic JSON hashing and EIP-712 attestations for AI agents via x402.

The linked repository no longer exists on GitHub — it was deleted or made private.

Uptime history 16 days of history

16 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

292 ms

Response time

average over 24h

open, no key

Access

streamable-http

This one has been quiet for a while

Quiet is not dead — but it is worth knowing when it wakes up, or when someone else takes it over. We watch the repository and tell you either way.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 8 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add canonicalhash --transport http https://canonicalhash-production.up.railway.app/mcp

Settings → Connectors → Add custom connector, then paste this address

https://canonicalhash-production.up.railway.app/mcp

~/.codex/config.toml

[mcp_servers.canonicalhash]
url = "https://canonicalhash-production.up.railway.app/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "canonicalhash": {
      "url": "https://canonicalhash-production.up.railway.app/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "canonicalhash": {
      "type": "http",
      "url": "https://canonicalhash-production.up.railway.app/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.

batch

batch_canonicalize

Batch canonicalize up to 1000 JSON payloads in one call.

canonicalize

canonicalize

Canonicalize JSON with RFC 8785 and return a SHA-256 hash plus an EIP-712 signed attestation.

receipt

create_receipt

Generate a tamper-evident EIP-712 action receipt for an agent decision.

structure

structure_extraction

Extract structured JSON from messy text (emails, logs, tickets) using regex or Needle 3.

verify

verify_attestation

Verify an EIP-712 attestation against the published public key. Always free.

Endpoints

URL	Transport	State	Latency	Checked
https://canonicalhash-production.up.railway.app/mcp	streamable-http	answering	274 ms	8 min ago

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Canonicalhash — questions

Answers built from our own checks of this server.

What can Canonicalhash do?

It exposes 5 tools, read directly from the server on our last check. Among them: batch_canonicalize, canonicalize, create_receipt, structure_extraction, verify_attestation. 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 Canonicalhash 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 292 ms. The bar chart above shows every period we have measured.

Is Canonicalhash still maintained?

The linked repository no longer exists on GitHub — it was deleted or made private. We show this because it changes what you can expect: an unmaintained server may keep answering for months and then stop without warning.

How do I connect Canonicalhash?

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.

Does Canonicalhash need an API key?

No. Canonicalhash 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 Canonicalhash?

It answers our handshake in 292 ms on average, which is faster than 49% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.