Twelve Permissions

Measured conclusion: Alive, not deep-tested. L2 outcome: not_attempted.

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

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "Twelve Permissions": {
      "url": "https://twelvepermissions.com/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (6)

• 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.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• get_piece

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

  Parameters:

  • id (required) — string — Piece id, e.g. "01"

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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.

  Parameters:

  • id (required) — string
  • buyer_address — string — Optional: your XRPL address, inserted into the template

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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.

  Parameters:

  • id (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

Publisher website Repository

Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.