> ## 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.

# Create Vault

> Create or resolve a user's Squads multisig and vault — server-paid.

## POST /sponsor/create

Derives a deterministic multisig + vault for the user and creates it on-chain if it doesn't already exist. The server pays all rent and fees — no SOL required from the user. If the multisig already exists (e.g. the user cleared storage or logged in on a new device), the existing PDAs are returned without re-creating.

The multisig is created with two members: the user (`Permissions.all()`) and the server (`Permission.Execute`), threshold `1`, and `rentCollector` set to the server.

## Request

```json theme={null}
{
  "userPubkey": "9xQe…base58 Solana address"
}
```

| Field        | Type     | Required | Description                         |
| ------------ | -------- | -------- | ----------------------------------- |
| `userPubkey` | `string` | Yes      | The user's Solana wallet public key |

## Response

```json theme={null}
{
  "multisigPda": "…",
  "vaultPda": "…",
  "signature": "…"
}
```

| Field         | Description                                                     |
| ------------- | --------------------------------------------------------------- |
| `multisigPda` | The multisig config account address                             |
| `vaultPda`    | The vault address (treasury) — fund and receive here            |
| `signature`   | Creation tx signature (omitted if the multisig already existed) |

<Note>
  The vault address is derived deterministically from `userPubkey`, so this endpoint is idempotent — calling it again returns the same PDAs.
</Note>