MCP server

Twelve Permissions Official

com.twelvepermissions/twelve-permissions

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Website Source

At a glance

Type

MCP server

Publisher

twelvepermissions.com (verified by the MCP Registry)

Status

Working at last check

Tools

6

Token cost

About 630 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"twelve-permissions":{"type":"http","url":"https://twelvepermissions.com/mcp"}}}

Antigravity

agy mcp add twelve-permissions https://twelvepermissions.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"twelve-permissions","server_url":"https://twelvepermissions.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"twelve-permissions","server_url":"https://twelvepermissions.com/mcp"}

Tools

• get_buy_transaction ~132 tokens
  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.
• get_piece ~97 tokens
  Get full metadata for one seal by id ("01".."12"): the canonical authorization record, its sha256, image URLs, and mainnet mint transaction.
• get_refusals ~108 tokens
  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.
• get_x402_info ~106 tokens
  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.
• list_pieces ~87 tokens
  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.
• verify_seal ~100 tokens
  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.

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Badge for your README

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