> Solana Developer Platform docs, served as Markdown. The [docs index](https://platform-beta.solana.com/docs.md) lists every page and [llms.txt](https://platform-beta.solana.com/docs/ai/llms.txt) the key ones; [SKILL.md](https://platform-beta.solana.com/SKILL.md) has the rules for building on SDP.

# Build a withdrawal transaction

Builds an unsigned withdrawal transaction for a position, for the customer's wallet to sign.

> **Earn is under active development.** Features, API endpoints, and docs may change.

`POST /v1/earn/external-wallet/withdrawal-transactions`

Withdrawals keep working after a provider stops taking deposits. Send `minAmountOut` when the strategy's `withdrawalSlippage` is not null, and omit it when null. A provider-order route may not support a preview: it places an order that pays out later, not an instant redemption.

Requires an [API key](/docs/developing-with-sdp/authentication) with the `earn.execute` action.

## Headers

- **`x-project-id`** · `string` · min length 1 · example `prj_example`

  Required for dashboard sessions. API keys use their assigned project.

## Request body

`application/json` · required

Build one unsigned withdrawal transaction for a position. SDP reads the strategy and mints from the position.

- **`positionId`** · `string` · required · min length 1 · max length 128 · example `earn_position_2f8b6b04-7147-487e-b760-b1caa4fbcb8b`

  The position's ID, from the positions list or the deposit submit response.

- **`redemptionMode`** · `string` · one of `standard`, `instant`

  The redemption route to build: `standard` queues a provider-managed order for a later payout, `instant` is the provider's faster route but still waits for cross-chain delivery — chain confirmation alone is not payout, so treat the exit as complete only at the movement's verified `delivered` outcome. Defaults to `standard`; a provider without the requested route refuses the build.

- **`shares`** · `string` · required · max length 128 · pattern `^(?=.*[1-9])\d+(\.\d+)?$` · example `10`

  Shares to redeem, decimal string in share units.

- **`minAmountOut`** · `string` · max length 128 · pattern `^(?=.*[1-9])\d+(\.\d+)?$` · example `19.98`

  Withdrawal slippage floor: the minimum deposit-token amount to accept, as a decimal string. Derive it from the withdrawal preview's `assetsOut` minus your tolerance. Required when the strategy's `withdrawalSlippage` is not null; refused with 400 when it is null, because the transaction cannot enforce it.

- **`feePayer`** · `string` · min length 32 · max length 44 · pattern `^[1-9A-HJ-NP-Za-km-z]{32,44}$` · example `3nMFwZXwY1s1M5s8vYAHqd4wGs4iSxXE4LRoUMMYqEgF`

  Pay for this transaction from a wallet your backend controls instead of the customer's. The named address becomes the fee payer: it pays the network fee, funds any share-account rent, and must sign alongside the customer. Co-sign on your backend before you submit. The build returns 400, naming the fee payer, when it cannot pay. Sending the customer's own address keeps the default: the customer pays and signs alone.

## Responses

- **`200`** Unsigned withdrawal transaction

  - **`data`** · `object` · required

    - **`transaction`** · `object` · required

      The common fields of one built withdrawal transaction.

      - **`transactionId`** · `string` · required · example `earn_external_wallet_transaction_e7a88258-1d19-48f3-8d0e-81fefa4bf3b3`

      - **`transaction`** · `string` · required

        Base64 wire bytes of the unsigned transaction. Add every required signature without changing the message, then submit through SDP. The blockhash bounds when the network can first accept it; retain the original signed bytes for recovery.

      - **`lastValidBlockHeight`** · `string` · required · example `361186610`

        Last block height at which the network can first accept this transaction. This is a block height, not a slot or timestamp.

      - **`sponsored`** · `boolean` · required · example `false`

        Always false: SDP does not pay an external wallet's fees. The customer's wallet pays, or the `feePayer` you name.

      - **`ownerAddress`** · `string` · required · example `9WzDXwBbmkg8ZTbNMqUxvQRAyrZzDsGYdLVL9zYtAWWM`

        The customer's wallet address.

      - **`feePayer`** · `string` · example `3nMFwZXwY1s1M5s8vYAHqd4wGs4iSxXE4LRoUMMYqEgF`

        The `feePayer` your build request named. When present, the transaction needs the fee payer's signature as well as the customer's: co-sign on your backend before you submit, or the submit refuses it. When omitted, the customer signs alone and pays the fee.

      - **`provider`** · `string` · required · example `kamino`

      - **`providerReference`** · `string` · required · example `7uib8xGAwkaPz4ZGCA6t8sSEid5Yp9ty13PHUweTypx`

        The strategy's onchain address at the provider. It identifies the instrument; never send funds to it.

      - **`tokenMint`** · `string` · required · example `4zMMC9srt5Ri5X14GAgXhaHii3GnPAEERYPJgZJDncDU`

      - **`shareMint`** · `string` · required · example `hXm2xSRF5PLKGMrTvAWqKhR76MuJX5dAabeSChkjqu2`

      - **`shares`** · `string` · required · max length 128 · pattern `^(?=.*[1-9])\d+(\.\d+)?$` · example `25`

        Positive decimal string with at least one non-zero digit; never a float.

      - **`minAmountOut`** · `string | null` · required · max length 128 · pattern `^(?=.*[1-9])\d+(\.\d+)?$` · example `25`

        The floor encoded in the transaction, or null when the request carried none.

      - **`positionId`** · `string` · required · example `earn_position_2f8b6b04-7147-487e-b760-b1caa4fbcb8b`

  - **`meta`** · `object` · required

    Response metadata.

    - **`requestId`** · `string` · required · min length 1 · example `req_example`

      Request identifier for tracing.

    - **`timestamp`** · `string` · required · format `date-time` · example `2025-01-01T00:00:00.000Z`

      ISO 8601 timestamp.

- **`400`** Bad Request

  - **`error`** · `object` · required

    Standard error payload.

    - **`code`** · `string` · required

      Machine-readable error code.

    - **`message`** · `string` · required

      Human-readable error message.

    - **`details`** · `object`

      Optional error details for debugging.

      - **`*`** · `any`

  - **`meta`** · `object`

    - **`requestId`** · `string` · min length 1 · example `req_example`

      Request identifier for tracing.

- **`401`** Unauthorized

  Same fields as `400`.

- **`403`** Forbidden. Requires the `earn.execute` action: an API key must hold it (a module's `manage` or `execute` also covers its `read`), and a signed-in member's organization role must include it. Without it the error is INSUFFICIENT_PERMISSIONS and `error.details.action` names the action. Any other 403 names its own reason.

  Same fields as `400`.

- **`404`** Not Found

  Same fields as `400`.

- **`429`** Too Many Requests

  Same fields as `400`.

- **`500`** Internal Server Error

  Same fields as `400`.

- **`501`** The provider does not support this operation.

  - **`error`** · `object` · required

    Standard error payload.

    - **`code`** · `string` · required

    - **`message`** · `string` · required

      Human-readable error message.

    - **`details`** · `object`

      Optional error details for debugging.

      - **`*`** · `any`

  - **`meta`** · `object`

    - **`requestId`** · `string` · min length 1 · example `req_example`

      Request identifier for tracing.

- **`503`** Service Unavailable

  Same fields as `400`.

## Example request

```bash tab="cURL"
curl -X POST 'https://api.solana.com/v1/earn/external-wallet/withdrawal-transactions' \
  -H "Authorization: Bearer $SDP_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "positionId": "earn_position_2f8b6b04-7147-487e-b760-b1caa4fbcb8b",
    "shares": "10"
  }'
```

```ts tab="TypeScript"
const res = await fetch("https://api.solana.com/v1/earn/external-wallet/withdrawal-transactions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.SDP_API_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "positionId": "earn_position_2f8b6b04-7147-487e-b760-b1caa4fbcb8b",
    "shares": "10"
  })
});
```

```python tab="Python"
import os, requests

r = requests.post("https://api.solana.com/v1/earn/external-wallet/withdrawal-transactions",
  headers={"Authorization": f"Bearer {os.environ['SDP_API_KEY']}"},
  json={
    "positionId": "earn_position_2f8b6b04-7147-487e-b760-b1caa4fbcb8b",
    "shares": "10"
  })
```

## Example responses

```json tab="200"
{
  "data": {
    "transaction": {
      "transactionId": "earn_external_wallet_transaction_0ebe7320-4b8e-4d1a-a5f0-6c2d9e8b1f47",
      "transaction": "AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
      "lastValidBlockHeight": "361186972",
      "sponsored": false,
      "ownerAddress": "9WzDXwBbmkg8ZTbNMqUxvQRAyrZzDsGYdLVL9zYtAWWM",
      "provider": "kamino",
      "providerReference": "C7N2fqV2GvhFghDf5PJSwstyjedjLNCY1cm2Ak7TeU83",
      "tokenMint": "4zMMC9srt5Ri5X14GAgXhaHii3GnPAEERYPJgZJDncDU",
      "shareMint": "CeirL1mAehaM6g2EccgMUQwohNfnuyicskVQ4r9ekXk6",
      "positionId": "earn_position_2f8b6b04-7147-487e-b760-b1caa4fbcb8b",
      "shares": "10",
      "minAmountOut": null
    }
  },
  "meta": {
    "requestId": "req_example",
    "timestamp": "2025-01-01T00:00:00.000Z"
  }
}
```

```json tab="403"
{
  "error": {
    "code": "INSUFFICIENT_PERMISSIONS",
    "message": "Missing action: earn.execute",
    "details": {
      "action": "earn.execute"
    }
  },
  "meta": {
    "requestId": "req_example"
  }
}
```

Error responses use the [standard error shape](/docs/reference/conventions/errors).