# Debt swap

Endpoint reference for the 1delta API. Index: https://docs.1delta.io/llms.txt · every endpoint: https://docs.1delta.io/llms-full.txt

---

### GET /v1/actions/loop/debt-swap

- operationId: `debt-swap`
- docs: https://docs.1delta.io/1delta-api/debt-swap/
- markdown: https://docs.1delta.io/1delta-api/debt-swap.md
- tags: Loop (Actions)

Debt swap

Swap debt between different borrow positions. Identify the repay-side debt market with `marketUidIn` and borrow-side with `marketUidOut`. Omit `account` for quote-only (returns `data.quotes` with price deltas). Include `account` to build full transaction calldata (populates `actions` with `alternatives`, `transactions`, and `permissions`).

**Response `actions` fields (when `account` is provided):**
- `alternatives`: DEX aggregator swap transactions sorted best-output-first. Pick one to execute.
- `transactions`: Empty for debt-swap operations (no setup needed).
- `permissions`: Lender borrow and withdrawal delegations (targeting the lending protocol contract). Only missing delegations are returned. Execute these first.

**Parameters**

| Name | 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 |
| `irModeIn` | query | 0 \| 1 \| 2 | no | Interest rate mode for repaid debt |
| `irModeOut` | query | 0 \| 1 \| 2 | no | Interest rate mode for new debt |
| `usePendleMintRedeem` | query | boolean | no | Use Pendle mint/redeem |
| `isAll` | query | boolean | no | Repay full debt |
| `accountId` | query | string | no | Account ID |

**Response `200`** — Quote or full build response

| Field | Type | Description |
| --- | --- | --- |
| `success` | true |  |
| `data` | object | Informational data (quotes, simulation results, etc.) |
| `data.lender` | string | Protocol identifier |
| `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[].utilization.current` | number | Current value |
| `data.quotes[].rateImpact[].utilization.projected` | number | Projected value after the action |
| `data.quotes[].rateImpact[].borrowRate` | object | A current/projected pair for a single rate metric. |
| `data.quotes[].rateImpact[].borrowRate.current` | number | Current value |
| `data.quotes[].rateImpact[].borrowRate.projected` | number | Projected value after the action |
| `data.quotes[].rateImpact[].depositRate` | object | A current/projected pair for a single rate metric. |
| `data.quotes[].rateImpact[].depositRate.current` | number | Current value |
| `data.quotes[].rateImpact[].depositRate.projected` | number | Projected value after the action |
| `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.quotes[].tx` | object | An EVM transaction ready to sign and broadcast. Send `to`, `data` and `value` as-is; do not re-encode them. |
| `data.quotes[].tx.to` | string | Target contract address |
| `data.quotes[].tx.data` | string | Encoded calldata |
| `data.quotes[].tx.value` | string | ETH value to send with the transaction |
| `data.quotes[].tx.description` | string | Human-readable label. For `alternatives`, this is the aggregator name (e.g. "Paraswap"). For `transactions`, describes the setup action (e.g. "Switch e-mode to 1"). |
| `data.permissionTxns` | object[] | Approvals needed for this specific quote. Most integrators should use the deduplicated envelope-level `actions.permissions` instead. |
| `data.permissionTxns[].to` | string | Target contract address |
| `data.permissionTxns[].data` | string | Encoded calldata |
| `data.permissionTxns[].value` | string | ETH value |
| `data.permissionTxns[].description` | string | Human-readable description of the approval (e.g. "Approve borrow for AAVE_V3", "Approve ERC20") |
| `data.permissionTxns[].spender` | string | ERC-20 approve spender (x-chain permissions). Match it against the selected quote's `approvalTarget` — several bridges can share one spender, so do not match by description. |
| `actions` | object | Transaction calldata and approvals. Null for quote-only responses (no account provided). |
| `actions.transactions` | object[] | Pre-trade setup transactions (e.g. e-mode switch, collateral enable). Execute these before the main swap. Empty when no setup is needed. |
| `actions.transactions[].to` | string | Target contract address |
| `actions.transactions[].data` | string | Encoded calldata |
| `actions.transactions[].value` | string | ETH value to send with the transaction |
| `actions.transactions[].description` | string | Human-readable label. For `alternatives`, this is the aggregator name (e.g. "Paraswap"). For `transactions`, describes the setup action (e.g. "Switch e-mode to 1"). |
| `actions.alternatives` | object[] | DEX aggregator swap transactions sorted by best output (descending). Each entry's `description` is the aggregator name. The client should pick one to execute. Present on loop action endpoints. |
| `actions.alternatives[].to` | string | Target contract address |
| `actions.alternatives[].data` | string | Encoded calldata |
| `actions.alternatives[].value` | string | ETH value to send with the transaction |
| `actions.alternatives[].description` | string | Human-readable label. For `alternatives`, this is the aggregator name (e.g. "Paraswap"). For `transactions`, describes the setup action (e.g. "Switch e-mode to 1"). |
| `actions.permissions` | object[] | Approval/delegation transactions that must execute before both `transactions` and `alternatives`. Includes ERC20 allowances (targeting the composer contract) and lender borrow/withdrawal delegations (targeting the lending protocol contract directly). Filtered against on-chain state so only missing approvals are returned. Null when no approvals are needed. |
| `actions.permissions[].to` | string | Target contract address |
| `actions.permissions[].data` | string | Encoded calldata |
| `actions.permissions[].value` | string | ETH value |
| `actions.permissions[].description` | string | Human-readable description of the approval (e.g. "Approve borrow for AAVE_V3", "Approve ERC20") |
| `actions.permissions[].spender` | string | ERC-20 approve spender (x-chain permissions). Match it against the selected quote's `approvalTarget` — several bridges can share one spender, so do not match by description. |

**Example response**

```json
{
  "success": true,
  "data": {
    "lender": "AAVE_V3",
    "quotes": [
      {
        "deltas": {
          "aggregator": "string",
          "tradeInput": 1,
          "tradeOutput": 1,
          "deltas": {}
        },
        "rateImpact": [
          {
            "marketUid": "AAVE_V3:8453:0x4200000000000000000000000000000000000006",
            "utilization": {
              "current": 1,
              "projected": 1
            },
            "borrowRate": {
              "current": 1,
              "projected": 1
            },
            "depositRate": {
              "current": 1,
              "projected": 1
            }
          }
        ]
      }
    ],
    "rateImpact": [
      {
        "marketUid": "AAVE_V3:8453:0x4200000000000000000000000000000000000006",
        "utilization": {
          "current": 1,
          "projected": 1
        },
        "borrowRate": {
          "current": 1,
          "projected": 1
        },
        "depositRate": {
          "current": 1,
          "projected": 1
        }
      }
    ]
  },
  "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"
      }
    ]
  }
}
```

**Response `400`** — Validation error

**Response `429`** — Rate limited. Unauthenticated callers share a per-IP budget; send an `x-api-key` header to lift it. Retry with exponential backoff.

**Response `500`** — Unexpected server error. Safe to retry with backoff.

**Response `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.