> 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 cancellation transaction

Builds an unsigned transaction that cancels a withdrawal request, 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-request-cancel-transactions`

A solver queue request can be canceled only at `expiredCancelable`, because a solver may fulfill it until its deadline; before then the build returns `409 CONFLICT`. An operator redemption that allows cancellation can be canceled while `pending`, which leaves the customer holding the intermediate token, not the original shares. Requires `earn.manage`. Cancellation stays available without production access and while Earn is disabled; a suspended organization still cannot authenticate.

Requires an [API key](/docs/developing-with-sdp/authentication) with the `earn.manage` 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 a cancellation for the customer's wallet to sign. A solver queue request becomes cancelable at `expiredCancelable`; an operator redemption that allows cancellation can be canceled while `pending`.

- **`withdrawalRequestId`** · `string` · required · min length 1 · max length 128 · example `earn_vault_withdrawal_request_3c905ad2-c92c-4258-9675-1899c41569b9`

- **`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 cancellation transaction

  - **`data`** · `object` · required

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

      A cancellation for the customer's wallet to sign.

      - **`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`

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

      - **`withdrawalRequestId`** · `string` · required · example `earn_vault_withdrawal_request_3c905ad2-c92c-4258-9675-1899c41569b9`

      - **`action`** · `string` · required · always `cancel`

      - **`mechanism`** · `string` · required · one of `solverQueue`, `operatorRedemption`

      - **`requestAddress`** · `string` · required

        Provider request account address.

  - **`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.manage` 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`.

- **`409`** Conflict

  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-request-cancel-transactions' \
  -H "Authorization: Bearer $SDP_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "withdrawalRequestId": "earn_vault_withdrawal_request_3c905ad2-c92c-4258-9675-1899c41569b9"
  }'
```

```ts tab="TypeScript"
const res = await fetch("https://api.solana.com/v1/earn/external-wallet/withdrawal-request-cancel-transactions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.SDP_API_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "withdrawalRequestId": "earn_vault_withdrawal_request_3c905ad2-c92c-4258-9675-1899c41569b9"
  })
});
```

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

r = requests.post("https://api.solana.com/v1/earn/external-wallet/withdrawal-request-cancel-transactions",
  headers={"Authorization": f"Bearer {os.environ['SDP_API_KEY']}"},
  json={
    "withdrawalRequestId": "earn_vault_withdrawal_request_3c905ad2-c92c-4258-9675-1899c41569b9"
  })
```

## Example responses

```json tab="200"
{
  "data": {
    "transaction": {
      "transactionId": "earn_external_wallet_withdrawal_request_transaction_9a3c1e27-5d84-4f0b-b6e2-7f19c4a8d035",
      "transaction": "AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
      "lastValidBlockHeight": "361187340",
      "sponsored": false,
      "ownerAddress": "9WzDXwBbmkg8ZTbNMqUxvQRAyrZzDsGYdLVL9zYtAWWM",
      "provider": "veda",
      "providerReference": "3wbKP5UGLT7gAZBAsLjvPC1NbfnWKtT3Dq7cniMWkzfU",
      "tokenMint": "4zMMC9srt5Ri5X14GAgXhaHii3GnPAEERYPJgZJDncDU",
      "shareMint": "CdV7pjj6WANsdasKsBvdKAn7qJL7cQ2Q3CJMBEe13WAV",
      "positionId": "earn_position_0432ffeb-c574-4b11-80dc-a09defb68fcc",
      "requestAddress": "DKw4pYcvXNLs91RssedGFznWRpbvPttp2AAwNCG7fQRz",
      "withdrawalRequestId": "earn_vault_withdrawal_request_3c905ad2-c92c-4258-9675-1899c41569b9",
      "action": "cancel",
      "mechanism": "solverQueue"
    }
  },
  "meta": {
    "requestId": "req_example",
    "timestamp": "2025-01-01T00:00:00.000Z"
  }
}
```

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

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