The reference app, built on Torna
TornaDEX
TornaDEX is a central limit order book built on the Torna index, the live proof that the primitive works end to end. Trade as one of four pre-funded demo identities, or connect your own wallet and grab demo tokens from the faucet. Place, take, and cancel are real devnet transactions; the book is read straight from the on-chain B+ tree, with no indexer.
Connect a devnet wallet to trade as yourself and fund it from the faucet, or just use a pre-funded demo trader below. No wallet needed to try it.
Place rests a limit order on the book (you are the maker).
From a key to the exact accounts
This is what an integrating program does, not just TornaDEX. You call with a key; the SDK reads the tree and emits the exact account set. The hard parts (node indices, PDA bumps, the descent path, split spares) never leave the library. Below is a real place resolved live on devnet.
import { Tree, keys } from "torna-sdk";
const tree = new Tree(program, creator, askTreeId);
const key = keys.orderKey(Side.Ask, price, slot, maker, nonce);
// the planner reads the tree off-chain and returns the exact accounts
const { ix } = await placeIx({ reader, tree, side: ASK, price, size, ... });
// node_idx / bump / path / spares: never touched by you