> ## Documentation Index
> Fetch the complete documentation index at: https://docs.heysage.me/llms.txt
> Use this file to discover all available pages before exploring further.

# Sponsor & Send

> Add the server fee-payer signature to a user-signed transaction and broadcast it.

## POST /sponsor/send

Receives a base64-encoded, user-signed `VersionedTransaction`, adds the server's signature as fee payer, and broadcasts it. The transaction must already carry all required non-server signatures (e.g. the user's member signature on `vaultTransactionCreate + proposalCreate + proposalApprove`).

## Request

```json theme={null}
{
  "transaction": "<base64-encoded VersionedTransaction>"
}
```

| Field         | Type     | Required | Description                                      |
| ------------- | -------- | -------- | ------------------------------------------------ |
| `transaction` | `string` | Yes      | Base64 of the user-signed `VersionedTransaction` |

## Response

```json theme={null}
{
  "signature": "…"
}
```

| Field       | Description                                  |
| ----------- | -------------------------------------------- |
| `signature` | The confirmed on-chain transaction signature |

## Related: POST /sponsor/close

Reclaims rent from a completed proposal's vault transaction and proposal accounts back to the multisig's `rentCollector` (the server). Permissionless on-chain — no user signature required. Called automatically by `/execute` after a successful execution.

```json theme={null}
{
  "multisigPda": "…",
  "transactionIndex": "7"
}
```

| Field              | Type     | Required | Description                         |
| ------------------ | -------- | -------- | ----------------------------------- |
| `multisigPda`      | `string` | Yes      | The multisig config account address |
| `transactionIndex` | `string` | Yes      | The transaction index to close      |