Close position (simulate)

POST 
/v1/actions/loop/close

Close a leveraged position and simulate post-trade state. Same parameters as GET. Optionally send a JSON body with current portfolio state (balanceData, aprData, positions) to receive projected post-trade metrics in the simulation field — if omitted, the API fetches balances on-chain automatically. Use the data returned by the user-positions endpoint directly — always include positions for accurate health-factor and borrow-capacity projections.

Plain-text reference — POST /v1/actions/loop/close

Parameters

Parameter	In	Type	Required	Description
route	query	auto, bundler3, native, composer, proxy	no	Which assembly to use, for lenders that have more than one. Morpho Blue only today.

• (omitted) — auto: prefer the protocol’s own tooling and fall back to the composer for anything it cannot express (a cross-market pair, a margin paid in a foreign asset, an EXACT_OUTPUT close, a chain with no bundler3 or no swap adapter).
• bundler3 / native — force Morpho’s bundler3. A request it cannot serve becomes an ERROR instead of silently falling back, which is what makes the route testable.
• composer / proxy — force the 1delta composer.

The default matters: the bundler3 route asks for setAuthorization(GeneralAdapter1), Morpho’s own audited adapter, where the composer route asks for a standing grant on ours. | | marketUidIn | query | string | yes | Market identifier for input side (lender:chainId:address). | | marketUidOut | query | string | yes | Market identifier for output side (lender:chainId:address). | | slippage | query | number | yes | Slippage tolerance (basis points) | | account | query | string | no | Account address. Include to build transaction, omit for quote-only. | | amount | query | string | yes | Amount in wei | | tradeType | query | 0, 1 | no | Trade type (0=EXACT_INPUT, 1=EXACT_OUTPUT) | | irModeOut | query | 0, 1, 2 | no | Interest rate mode for debt | | usePendleMintRedeem | query | boolean | no | Use Pendle mint/redeem | | isAll | query | boolean | no | Repay full debt | | loanId | query | string | no | Lista DAO fixed-term (brokered) debt markets only. Identifies which loan the close repays on the loop's repay leg: the loan's loanId (broker posId) from the user-positions response, or the type(uint128).max sentinel (340282366920938463463374607431768211455) for the flexible/dynamic position. Required when marketUidOut is a brokered market; ignored otherwise. | | accountId | query | string | no | Account ID |

Request body

Field	Type	Required	Description
balanceData	object	yes	Aggregated balance data for a sub-account.
balanceData.deposits	number	no	Total deposits in USD
balanceData.debt	number	no	Total debt in USD
balanceData.adjustedDebt	number	no	Debt adjusted for borrow factors
balanceData.collateral	number	no	Collateral value in USD
balanceData.collateralAllActive	number	no	Collateral if all assets were enabled
balanceData.borrowDiscountedCollateral	number	no	Collateral discounted by borrow factors
balanceData.borrowDiscountedCollateralAllActive	number	no	Discounted collateral if all enabled
balanceData.nav	number	no	Net asset value (deposits - debt)
balanceData.deposits24h	number	no	Deposits 24h ago (for change calculation)
balanceData.debt24h	number	no	Debt 24h ago
balanceData.nav24h	number	no	NAV 24h ago
balanceData.rewards	object[]	no	Pending reward token claims. Each entry represents a single reward program.
balanceData.rewards[].asset	string	no	Reward token contract address
balanceData.rewards[].totalRewards	number	no	Total accumulated rewards (token units)
balanceData.rewards[].claimableRewards	number	no	Immediately claimable rewards (token units)
aprData	object	yes	APR breakdown for a sub-account.
aprData.apr	number	no	Net APR (deposit - borrow)
aprData.depositApr	number	no	Weighted deposit APR
aprData.borrowApr	number	no	Weighted borrow APR
aprData.rewardApr	number	no	Total reward APR
aprData.rewardDepositApr	number	no	Reward APR on deposits
aprData.rewardBorrowApr	number	no	Reward APR on borrows
aprData.intrinsicApr	number	no	Intrinsic yield APR (e.g., stETH staking)
aprData.intrinsicDepositApr	number	no	Intrinsic yield APR portion from deposits
aprData.intrinsicBorrowApr	number	no	Intrinsic yield APR portion from borrows
aprData.rewards	object	no	Per-reward-token APR breakdown. Keys are reward token addresses.
modeId	string	no	Mode/config key from userConfig.selectedMode (defaults to "0")
positions	object[]	no	Current lending positions from the matching sub-account's positions array. The full LendingPosition objects returned by user-positions are accepted — only the fields in SimulationPosition are used. Always include this for accurate health-factor and borrow-capacity projections.
positions[].marketUid	string	yes	Unique market identifier (format: {lender}:{chainId}:{address})
positions[].depositsUSD	number	yes	Deposit amount in USD
positions[].debtUSD	number	yes	Variable debt in USD
positions[].debtStableUSD	number	yes	Stable debt in USD
positions[].collateralEnabled	boolean	yes	Whether this asset is enabled as collateral

Response 200

Field	Type	Description
success	True
data	object	Quotes and simulation results
data.lender	string	Protocol identifier. See the LenderId schema.
data.quotes	object[]	Candidate routes, best output first. Execute exactly one.
data.quotes[].deltas	object
data.quotes[].deltas.aggregator	string	Aggregator source
data.quotes[].deltas.tradeInput	number	Trade input amount
data.quotes[].deltas.tradeOutput	number	Trade output amount
data.quotes[].deltas.deltas	object	Balance deltas
data.quotes[].rateImpact	object[]	Projected interest-rate impact per market for THIS quote (its own trade amounts). Omitted if IRM data is unavailable.
data.quotes[].rateImpact[].marketUid	string	Market identifier (format: lender:chainId:address)
data.quotes[].rateImpact[].utilization	object	A current/projected pair for a single rate metric.
data.quotes[].rateImpact[].borrowRate	object	A current/projected pair for a single rate metric.
data.quotes[].rateImpact[].depositRate	object	A current/projected pair for a single rate metric.
data.rateImpact	object[]	Projected interest-rate impact per market. Single-market actions produce 1 entry; loop actions produce 2. Null if IRM data is unavailable.
data.rateImpact[].marketUid	string	Market identifier (format: lender:chainId:address)
data.rateImpact[].utilization	object	A current/projected pair for a single rate metric.
data.rateImpact[].utilization.current	number	Current value
data.rateImpact[].utilization.projected	number	Projected value after the action
data.rateImpact[].borrowRate	object	A current/projected pair for a single rate metric.
data.rateImpact[].borrowRate.current	number	Current value
data.rateImpact[].borrowRate.projected	number	Projected value after the action
data.rateImpact[].depositRate	object	A current/projected pair for a single rate metric.
data.rateImpact[].depositRate.current	number	Current value
data.rateImpact[].depositRate.projected	number	Projected value after the action
data.simulation	object	Projected post-trade metrics, or null if simulation failed
data.simulation.pre	object	Portfolio state before the trade.
data.simulation.pre.healthFactor	number	Health factor before the trade (null-safe: capped at 1e18 when no debt)
data.simulation.pre.borrowCapacity	number	Borrow capacity (USD) before the trade
data.simulation.post	object	Projected portfolio state after the trade.
data.simulation.post.healthFactor	number	Projected health factor after the trade
data.simulation.post.borrowCapacity	number	Projected borrow capacity (USD) after the trade
data.simulation.post.balanceData	object	Aggregated balance data for a sub-account.
data.simulation.post.aprData	object	APR breakdown for a sub-account.
data.simulationError	string	Error message if simulation failed
data.lender	string	Protocol identifier. See the LenderId schema.
data.quotes	object[]	Candidate routes, best output first. Execute exactly one.
data.quotes[].deltas	object
data.quotes[].deltas.aggregator	string	Aggregator source
data.quotes[].deltas.tradeInput	number	Trade input amount

Example response

{
  "success": true,
  "data": {
    "lender": "AAVE_V3",
    "quotes": [
      {
        "deltas": {
          "aggregator": "string",
          "tradeInput": 1.0,
          "tradeOutput": 1.0,
          "deltas": {}
        },
        "rateImpact": [
          {
            "marketUid": "AAVE_V3:8453:0x4200000000000000000000000000000000000006",
            "utilization": {
              "current": 1.0,
              "projected": 1.0
            },
            "borrowRate": {
              "current": 1.0,
              "projected": 1.0
            },
            "depositRate": {
              "current": 1.0,
              "projected": 1.0
            }
          }
        ]
      }
    ],
    "rateImpact": [
      {
        "marketUid": "AAVE_V3:8453:0x4200000000000000000000000000000000000006",
        "utilization": {
          "current": 1.0,
          "projected": 1.0
        },
        "borrowRate": {
          "current": 1.0,
          "projected": 1.0
        },
        "depositRate": {
          "current": 1.0,
          "projected": 1.0
        }
      }
    ],
    "simulation": {
      "pre": {
        "healthFactor": 1.85,
        "borrowCapacity": 3000
      },
      "post": {
        "healthFactor": 2.1,
        "borrowCapacity": 3500,
        "balanceData": {
          "deposits": 10000.5,
          "debt": 5000.25,
          "adjustedDebt": 5500,
          "collateral": 9000,
          "collateralAllActive": 10000.5,
          "borrowDiscountedCollateral": 8000,
          "borrowDiscountedCollateralAllActive": 9000,
          "nav": 5000.25,
          "deposits24h": 9800,
          "debt24h": 4900,
          "nav24h": 4900,
          "rewards": [
            {
              "asset": "0xc00e94Cb662C3520282E6f5717214004A7f26888",
              "totalRewards": 12.5,
              "claimableRewards": 12.5
            }
          ]
        },
        "aprData": {
          "apr": 2.5,
          "depositApr": 3.5,
          "borrowApr": 5.2,
          "rewardApr": 1.2,
          "rewardDepositApr": 0.8,
          "rewardBorrowApr": 0.4,
          "intrinsicApr": 0,
          "intrinsicDepositApr": 0,
          "intrinsicBorrowApr": 0,
          "rewards": {}
        }
      }
    },
    "simulationError": "string"
  },
  "actions": {
    "transactions": [
      {
        "to": "0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2",
        "data": "0x617ba037000000000000000000000000c02aaa39b2",
        "value": "0",
        "description": "string"
      }
    ],
    "alternatives": [
      {
        "to": "0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2",
        "data": "0x617ba037000000000000000000000000c02aaa39b2",
        "value": "0",
        "description": "string"
      }
    ],
    "permissions": [
      {
        "to": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
        "data": "0x617ba037000000000000000000000000c02aaa39b2",
        "value": "0",
        "description": "string",
        "spender": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"
      }
    ]
  }
}

Request

Responses

200

Quote or full build with simulation

400

Validation error

429

Rate limited. Unauthenticated callers share a per-IP budget; send an x-api-key header to lift it. Retry with exponential backoff.

500

Unexpected server error. Safe to retry with backoff.

502

An upstream data source or protocol origin failed (error.code is ORIGIN_FAILED). error.details carries the per-origin status. This is also what a missing or malformed required parameter currently returns, rather than a 400.