Twelve Permissions

Last 30 days

Uptime

100%

Response time

252 ms typical, 252 ms slowest 5%

Last check

5 h ago

Next check

in 50 min

How to call it

Add it to any MCP client that supports remote servers.

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

6 tools

• 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.

Security scan

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