Twelve Permissions is an MCP server with 6 tools an agent can call, among them get_buy_transaction, get_piece, get_refusals. It answers at https://twelvepermissions.com/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 6 of 6 times since 10 September 2026; the last check, on 19 October 2026, succeeded.
Browse, verify and buy Twelve Permissions NFTs on XRP Ledger. Every claim is checkable.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
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. Inputs: id, buyer_address |
get_piece | Get full metadata for one seal by id ("01".."12"): the canonical authorization record, its sha256, image URLs, and mainnet mint transaction. Inputs: id |
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. N |
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 |
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. |
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. Inputs: id |
Every block below points at https://twelvepermissions.com/mcp. Pick your client and copy.
claude mcp add --transport http twelve-permissions https://twelvepermissions.com/mcp
{
"mcpServers": {
"twelve-permissions": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://twelvepermissions.com/mcp"]
}
}
}{
"mcpServers": {
"twelve-permissions": {
"url": "https://twelvepermissions.com/mcp"
}
}
}{
"servers": {
"twelve-permissions": {
"type": "http",
"url": "https://twelvepermissions.com/mcp"
}
}
}{
"context_servers": {
"twelve-permissions": {
"url": "https://twelvepermissions.com/mcp"
}
}
}{
"mcpServers": {
"twelve-permissions": {
"serverUrl": "https://twelvepermissions.com/mcp"
}
}
}{
"mcpServers": {
"twelve-permissions": {
"url": "https://twelvepermissions.com/mcp"
}
}
}name: Twelve Permissions
version: 0.0.1
schema: v1
mcpServers:
- name: Twelve Permissions
type: streamable-http
url: https://twelvepermissions.com/mcp{
"mcpServers": {
"twelve-permissions": {
"httpUrl": "https://twelvepermissions.com/mcp"
}
}
}{
"mcpServers": {
"twelve-permissions": {
"type": "http",
"url": "https://twelvepermissions.com/mcp"
}
}
}{
"mcpServers": {
"twelve-permissions": {
"url": "https://twelvepermissions.com/mcp"
}
}
}goose://extension?url=https%3A%2F%2Ftwelvepermissions.com%2Fmcp&type=streamable_http&id=twelve-permissions&name=Twelve%20Permissions
It answered our last check on 19 October 2026 in 130 ms. Over 6 checks since 10 September 2026 it answered 6. Status here comes from Neuronto's own probes, not from the publisher.
Yes. It is published by twelvepermissions.com and served from twelvepermissions.com, the vendor's own domain: https://twelvepermissions.com/mcp.
6, as returned by the server's own tools/list on 11 September 2026: get_buy_transaction, get_piece, get_refusals, get_x402_info, list_pieces, verify_seal.
It answered our last check on 19 October 2026 in 130 ms. Over 6 checks since 10 September 2026 it answered 6.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://twelvepermissions.com/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: com.twelvepermissions. Endpoint host: twelvepermissions.com. ARD identifier: urn:air:com.twelvepermissions:mcp:twelve-permissions.
First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.