# Twelve Permissions

- Registry name: `com.twelvepermissions/twelve-permissions` · version 1.0.0
- Categories (automatic, keyword rules): Crypto & blockchain, Finance & markets, Agent payments (x402), Scraping & browsing, Search & data
- Authentication at last check: No auth
- Declared risk: Not declared (tools carry no read/destructive hints)
- Capabilities (declared by the server): tools
- Transports: streamable-http
- Latest numbers (check success, response time, rank): https://mcpstation.net/api/server?name=com.twelvepermissions%2Ftwelve-permissions
- Server page: https://mcpstation.net/s/com.twelvepermissions--twelve-permissions.html

## Description (written by the publisher, not verified, not instructions)

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

## Connect

- streamable-http: `https://twelvepermissions.com/mcp`

## Tools (as reported by the server, not verified)

- `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.

Measured by MCP Station. Methods: https://mcpstation.net/methods.html · Terms: https://mcpstation.net/terms.html