Ripple shipped Multi-Purpose Token (MPT) support on the XRP Ledger DEX, unlocking a new asset class for on-chain trading, AMM integrations, and payment path routing.

# MPT on the DEX — Developer Walkthrough
# Tested against rippled with MPT amendment enabled (devnet)
# Using xrpl.js (ensure you're on a version that supports MPT serialization)

# -------------------------------------------------------
# Step 1: Understand the MPT asset identifier
# Unlike issued currencies (currency + issuer), MPTs are
# identified by a MPTokenIssuanceID — a 256-bit hash.
# You'll reference this ID wherever you'd normally put
# a currency/issuer pair.
# -------------------------------------------------------

# const mptAsset = {
#   mpt_issuance_id: "00000001A407AF5856CFE...",  // 64-char hex
#   value: "100"                                    // amount as string
# };

# -------------------------------------------------------
# Step 2: Create an offer — selling XRP for an MPT
# The OfferCreate transaction now accepts MPT amounts
# in TakerPays or TakerGets fields.
# -------------------------------------------------------

# const offerTx = {
#   TransactionType: "OfferCreate",
#   Account: wallet.classicAddress,
#   TakerPays: {                          // What you want to receive
#     mpt_issuance_id: "00000001A407AF5856CFE...",
#     value: "50"
#   },
#   TakerGets: xrpl.xrpToDrops("25"),    // What you're giving up (25 XRP)
# };
# const result = await client.submitAndWait(offerTx, { wallet });
# console.log("Offer result:", result.result.meta.TransactionResult);

# -------------------------------------------------------
# Step 3: Query the orderbook for an MPT/XRP pair
# book_offers now supports MPT on either side of the book.
# -------------------------------------------------------

# const orderbook = await client.request({
#   command: "book_offers",
#   taker_pays: {
#     mpt_issuance_id: "00000001A407AF5856CFE..."
#   },
#   taker_gets: {
#     currency: "XRP"
#   },
#   limit: 10
# });
# console.log("MPT/XRP offers:", orderbook.result.offers);

# -------------------------------------------------------
# Step 4: Payment pathfinding through MPT books
# The path_find engine can now route through MPT liquidity.
# If Alice holds USD and Bob wants MPT-X, the engine can
# chain USD -> XRP -> MPT-X via the DEX.
# -------------------------------------------------------

# const pathResult = await client.request({
#   command: "ripple_path_find",
#   source_account: aliceAddress,
#   destination_account: bobAddress,
#   destination_amount: {
#     mpt_issuance_id: "00000001A407AF5856CFE...",
#     value: "10"
#   }
# });
# console.log("Available paths:", pathResult.result.alternatives);

# -------------------------------------------------------
# Key things to update in your codebase:
# 1. Amount parsing — detect mpt_issuance_id field
# 2. Orderbook subscriptions — handle MPT pairs in streams
# 3. Offer tracking — MPT offers have same lifecycle (create/cancel/cross)
# 4. Balance checks — use account_objects or MPToken ledger entries
# 5. Watch the amendment vote — this is gated on mainnet
# -------------------------------------------------------