> For the complete documentation index, see [llms.txt](https://docs.kpk.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kpk.io/funds/infrastructure/onchain-accounting/meta-balance-adapters/morpho-market.md).
# Morpho Markets
One immutable meta-adapter that reports an account's positions on *any* Morpho Blue market — collateral, loan supply, and loan borrow. Which markets it queries is a governed instance set on the NAV Calculator; the adapter itself holds no per-market state.
* **Type:** Meta-adapter
* **protocolSubId:** `keccak256("morpho-markets")`
* **Instance key:** the Morpho **marketId** (`bytes32`), used directly — not an address
* **Source:** [`MorphoMarketsMetaBalanceAdapter.sol`](https://github.com/karpatkey/onchain-accounting/blob/main/src/balances/MetaBalanceAdapters/MorphoMarketsMetaBalanceAdapter.sol)
***
## Positions returned
Up to three legs per market, each emitted only when its amount is `> 0`:
| Leg | PositionKind | isDebt | Description |
| ----------- | ------------ | ------- | ------------------------------------------ |
| Collateral | `Collateral` | `false` | Posted collateral, in the collateral token |
| Loan supply | `Supplied` | `false` | Supplied loan token (credit) |
| Loan borrow | `Borrowed` | `true` | Borrowed loan token (debt) |
The market's collateral and loan tokens come from `MORPHO.idToMarketParams(marketId)`. A **credit** leg is skipped if its asset is unregistered in NAVCalculator or excluded by `assetFilter`. If the account has **borrowed** and the loan token is unregistered, the market reports **nothing at all** — collateral included — rather than emitting collateral without its offsetting debt, which would over-report NAV. See [Never report collateral without its debt](/funds/infrastructure/onchain-accounting/balance-adapters.md#how-an-adapter-is-built).
***
## Balance calculation
Morpho Markets adapter — how the underlying balances reported to the NAV Calculator are derived.
Collateral is read raw from the account position:
```
collateral = MORPHO.position(marketId, account).collateral
```
Loan legs use Morpho's `expectedMarketBalances` (interest accrued to the current block), then pro-rate by shares:
```
(totalSupplyAssets, totalSupplyShares, totalBorrowAssets, totalBorrowShares) = MORPHO.expectedMarketBalances(mp)
supplied = totalSupplyAssets.mulDiv(pos.supplyShares, totalSupplyShares, Floor) // rounds down — avoid overstating credit
borrowed = totalBorrowAssets.mulDiv(pos.borrowShares, totalBorrowShares, Ceil) // rounds up — avoid understating debt
```
Each is guarded by non-zero total shares and non-zero account shares.
***
## Identity
* **positionId:** `abi.encode(bytes32 marketId)` — the raw marketId (all three legs of a market share it)
* **positionKind:** `Collateral` · `Supplied` · `Borrowed`
There is no `labels` field on the position. The adapter implements `positionLabels(positionId)`, which returns `["Market", "/"]` from the market's on-chain token symbols — surfaced only by the verbose reads (`getAccountPositionsVerbose` / `getAccountNavVerbose`); the full breadcrumb is `[protocolName, ...labels]`.
For a marketId with **no market on this chain** the leaf is dropped, giving the bare `["Market"]` category. This matters because Morpho's params getter is a plain mapping read: an unknown id returns an all-zero struct rather than reverting, both symbol reads would then fail open to `"?"`, and the adapter would answer `["Market", "?/?"]` — a confident breadcrumb byte-identical to a real market whose tokens both have unreadable symbols. Existence is checked against the invariant Morpho itself enforces at market creation, rather than inferred from the params: a market with no loan token is creatable, and an idle market legitimately has no collateral token, so neither is a property the protocol guarantees.
***
## Constructor
```solidity
constructor(address morpho_, address navCalculator_)
```
| Parameter | Description |
| ---------------- | ------------------------------------------------------- |
| `morpho_` | Morpho Blue singleton contract (must be a contract) |
| `navCalculator_` | NAV Calculator contract (asset registry + instance set) |
***
## Registration
Meta-adapter. Register once and seed its markets with `addMetaBalanceAdapter(adapter, instances)`, then adjust with `addMetaInstances(adapter, instances)` / `removeMetaInstances(adapter, instances)` (MANAGER-gated). Each instance coordinate is a **raw `bytes32` marketId** (not an address widened to bytes32). Adding a new market is a config call — no new deploy. A malformed coordinate is isolated per-instance by the adapter's fan-out.
---
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