Twelve Permissions MCP Server

by twelvepermissions Your server? Claim it

answering

Twelve Permissions is answering right now. Last checked 10 min ago. It exposes 6 tools. Last commit 17 Aug 2026.

Browse, verify and buy Twelve Permissions NFTs on XRP Ledger. Every claim is checkable.

Uptime history 16 days of history

16 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

140 ms

Response time

average over 24h

Stars

last commit 17 Aug 2026

Nothing serious here today

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

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 10 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add twelve-permissions --transport http https://twelvepermissions.com/mcp

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

{
  "mcpServers": {
    "twelve-permissions": {
      "url": "https://twelvepermissions.com/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.twelve-permissions]
url = "https://twelvepermissions.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "twelve-permissions": {
      "url": "https://twelvepermissions.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "twelve-permissions": {
      "url": "https://twelvepermissions.com/mcp"
    }
  }
}

Available tools 6

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

buy

get_buy_transaction

Construct the exact XRPL NFTokenAcceptOffer transaction to buy a seal, including the authorization-memo protocol your principal must approve. Read the rules in the response before submitting.

piece

get_piece

Get full metadata for one seal by id ("01".."12"): the canonical authorization record, its sha256, image URLs, and mainnet mint transaction.

pieces

list_pieces

List all Twelve Permissions seals: verifiable NFTs on XRP Ledger mainnet, each sealing a real human-to-AI authorization event. Returns names, prices, live offer indexes, and sold status.

refusals

get_refusals

The other half of the collection: the hash-chained ledger of the agent's standing constraints — what it will not do — including the erratum where it corrected an earlier, exaggerated version of its own record. Both anchors are on mainnet. Not for sale, ever.

verify

verify_seal

Verify a seal from first principles: recomputes sha256 of the canonical event record server-side and compares to the published event hash. Full independent verification instructions included.

x402

get_x402_info

Pay with USDC over HTTP instead of XRP: the x402 purchase rail (Base). Returns the endpoint, required authorized_by memo protocol, prices in USD, and delivery mechanics (directed XRPL transfer offer). You still need an XRPL address to hold the seal.

Endpoints

URL	Transport	State	Latency	Checked
https://twelvepermissions.com/mcp	streamable-http	answering	148 ms	10 min ago

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Twelve Permissions — questions

Answers built from our own checks of this server.

What can Twelve Permissions do?

It exposes 6 tools, read directly from the server on our last check. Among them: get_buy_transaction, get_piece, get_refusals, get_x402_info, list_pieces, verify_seal. 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 Twelve Permissions 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 140 ms. The bar chart above shows every period we have measured.

How do I connect Twelve Permissions?

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 Twelve Permissions need an API key?

No. Twelve Permissions completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 6 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Twelve Permissions?

It answers our handshake in 140 ms on average, which is faster than 83% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Twelve Permissions open source?

Yes — written in JavaScript 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.