MCP Radar
MCP Server

Twelve Permissions

com.twelvepermissions/twelve-permissions
Commerce & Retail Crypto & Web3 Public & reachable MCP 2026-07-28

What this MCP does

Lists, verifies, and constructs purchase transactions for authorization-record NFTs on the XRP Ledger.

Capabilities

Tools

6 tools
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.
Input schema 
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string'}, 'buyer_address': {'type': 'string', 'description': 'Optional: your XRPL address, inserted into the template'}}, 'additionalProperties': False}
get_piece
Get full metadata for one seal by id ("01".."12"): the canonical authorization record, its sha256, image URLs, and mainnet mint transaction.
Input schema 
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'Piece id, e.g. "01"'}}, 'additionalProperties': False}
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.
Input schema 
{'type': 'object', 'properties': {}, 'additionalProperties': False}
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.
Input schema 
{'type': 'object', 'properties': {}, 'additionalProperties': False}
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.
Input schema 
{'type': 'object', 'properties': {}, 'additionalProperties': False}
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.
Input schema 
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string'}}, 'additionalProperties': False}
History

Recent tool changes

Added
get_refusals
Sept. 17, 2026, 12:38 p.m.
Added
verify_seal
Sept. 17, 2026, 12:38 p.m.
Added
get_x402_info
Sept. 17, 2026, 12:38 p.m.
Added
get_buy_transaction
Sept. 17, 2026, 12:38 p.m.
Added
get_piece
Sept. 17, 2026, 12:38 p.m.
Added
list_pieces
Sept. 17, 2026, 12:38 p.m.
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