Twelve Permissions
Browse, verify and buy Twelve Permissions NFTs on XRP Ledger. Every claim is checkable.
| Endpoint | https://twelvepermissions.com/mcp (streamable-http) |
|---|---|
| Registry version | 1.0.0 |
| Now | 6 tools · grade A (98) · pin ts_e970fae2a3677241299aa87e4c3c0dd1 · protocol 2025-06-18 |
| First / last listed | 2026-11-02 02:07 UTC / 2026-11-02 02:07 UTC |
| Grade over time | 2026-11-02: A (98), 6 tools |
Is this your server? Own a server? ToolFit hosted watch re-checks it every 24 h ($0.25 per 30 days) or 6 h ($0.60) and sends you an HMAC-signed webhook when its tools or grade change: POST https://api.youraitools.co/toolfit/v1/watch. To opt out, see About & opt-out.
Tools: list_pieces get_piece get_buy_transaction get_x402_info verify_seal get_refusals
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. params: none |
get_piece | Get full metadata for one seal by id ("01".."12"): the canonical authorization record, its sha256, image URLs, and mainnet mint transaction. params: id* |
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. params: id*, buyer_address |
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. params: none |
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. params: 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. Not for sale, ever. params: none |
Entries describe changes in tool definitions. They are not statements about a server, its quality or its author. The grade measures how the tool definitions fit model providers (token cost, schema compatibility, confusable names) as scored by the ToolFit engine at the time of the listing. JSON: append .json. Opt-out: how or hello@youraitools.co.