# Open a trove

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

---

### POST /v1/actions/river/open

- operationId: `river-open`
- docs: https://docs.1delta.io/1delta-api/river-open/
- markdown: https://docs.1delta.io/1delta-api/river-open.md
- tags: Actions › River

Open a trove

Open a trove on a River market: deposit collateral, mint satUSD.

**River (rebranded Satoshi Protocol) is a Prisma-lineage pooled CDP** minting satUSD behind one SatoshiXApp diamond per chain (BNB, Base, Hemi). One TroveManager per collateral = one `RIVER_<chainId>_<TM_INDEX>` market; troves are keyed by OWNER ADDRESS — at most one per user per market, no ids. Interest is protocol-set (currently 0%); the only borrowing cost is a one-off decaying-baseRate mint fee (0.5%–5%) on open/borrow-more, guarded by `maxFeePercentage` (quoted automatically).

**Standard lending actions cover the day-to-day ops:**
- satUSD deposit/withdraw → the single per-chain Stability Pool (attached to market index 0; zero approvals)
- collateral deposit/withdraw → `addColl`/`withdrawColl` (no troveId — address-keyed)
- borrow → `withdrawDebt` (mint fee applies)
- repay → `repayDebt` clamped to `entireDebt − gasComp − minNetDebt`; `isAll=true` routes to `closeTrove` (burns `entireDebt − gasComp` from the wallet, returns all collateral; blocked in Recovery Mode)

The 2-satUSD debt-side gas compensation is minted on open and burned from the GasPool on close — it never touches the wallet.

Validates the diamond-level minNetDebt and rejects paused/sunsetting markets; quotes the mint-fee guard live. Returns the transaction plus the collateral approval (to the diamond).

**Request body** (`application/json`)

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `chainId` | string | yes | EVM chain id, as a decimal string. See the `ChainId` schema. |
| `lender` | string | yes | Per-market key, e.g. RIVER_8453_0 |
| `account` | string | yes | Trove owner (tx sender) |
| `collAmount` | string | yes | Collateral amount, raw units |
| `amount` | string | yes | satUSD debt to mint, raw units (net ≥ minNetDebt) |
| `maxFeePercentage` | string | no | Optional mint-fee guard override, WAD percentage |

**Example request body**

```json
{
  "chainId": "8453",
  "lender": "RIVER_8453_0",
  "account": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
  "collAmount": "1000000000000000000",
  "amount": "1000000000000000000",
  "maxFeePercentage": "string"
}
```

**Response `200`** — Open-trove transaction + approval

| Field | Type | Description |
| --- | --- | --- |
| `success` | true |  |
| `data` | object | Informational data (quotes, simulation results, etc.) |
| `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": {},
  "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.