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Twelve Permissions

com.twelvepermissions/twelve-permissions · v1.0.0

Measured by MCP Station

Description written by the publisher, not verified

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

Connect

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

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

Tools as reported by the server

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

Repository · Website · JSON · Text for agents · Registry updated 2026-08-16