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# Sponsor Multisig Fees

## Overview

Choose how the transaction gets its fee-payer signature:

* **[Relay](#relay):** Use a relay when a separate service controls the fee-payer key or applies
  sponsorship policy for many clients. Set `feePayer: true`; the relay signs and broadcasts the
  transaction after the multisig reaches quorum.
* **[Local account](#local-account):** Use a local account when the current trusted process
  controls the fee-payer key. Pass that account as `feePayer`, and Viem adds its signature to the
  transaction that every multisig owner approves.

## Recipes

### Relay

Compose the multisig coordinator with [`withRelay`](/tempo/transports/withRelay). The owners approve
a request with `feePayer: true`. This keeps the fee-payer key and sponsorship policy in the relay
instead of each application. After quorum, the relay signs and broadcasts the final transaction.

:::code-group
```ts twoslash [example.ts]
import { Account } from 'viem/tempo'
import { client } from './relay.config'

// 1. Create the independent owners and multisig.
const owner_1 = Account.fromSecp256k1(
  '0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80'
)
const owner_2 = Account.fromSecp256k1(
  '0x59c6995e998f97a5a0044966f0945389dc9e86dae88c7a8412f4603b6b78690d'
)
const multisig = Account.fromMultisig({
  owners: [owner_1.address, owner_2.address],
  threshold: 2,
})

// 2. Store the first owner approval with a relay fee payer.
const pending = await client.multisig.approveTransaction({
  account: owner_1,
  feePayer: true,
  multisig,
  to: '0xcafebabecafebabecafebabecafebabecafebabe',
  value: 1n,
})

// 3. Reach quorum and let the relay sponsor the final transaction.
const success = await client.multisig.approveTransaction({
  ...pending.request,
  account: owner_2,
})
```

```ts twoslash [relay.config.ts] filename="relay.config.ts"
import { createClient, http, withRelay } from 'viem/tempo'

// 1. Enable coordination and relay sponsorship on the client.
export const client = createClient({
  experimental_multisig: true,
  transport: withRelay(http(), http('https://relay.example.com')),
})
```
:::

### Local Account

Pass a local fee-payer account when the application or service already controls the fee-payer key
and does not need a separate sponsorship service. Viem adds its signature while preparing the
request, and later owners reuse that same request.

:::code-group
```ts twoslash [example.ts]
import { Account } from 'viem/tempo'
import { client } from './multisig.config'

// 1. Create the owners, fee payer, and multisig.
const owner_1 = Account.fromSecp256k1(
  '0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80'
)
const owner_2 = Account.fromSecp256k1(
  '0x59c6995e998f97a5a0044966f0945389dc9e86dae88c7a8412f4603b6b78690d'
)
const feePayer = Account.fromSecp256k1(
  '0x5de4111afa1a4b94908f83103eb1f1706367c2e68ca870fc3fb9a804cdab365a'
)
const multisig = Account.fromMultisig({
  owners: [owner_1.address, owner_2.address],
  threshold: 2,
})

// 2. Store the first approval with the local fee payer.
const pending = await client.multisig.approveTransaction({
  account: owner_1,
  feePayer,
  multisig,
  to: '0xcafebabecafebabecafebabecafebabecafebabe',
  value: 1n,
})

// 3. Reuse the fee-paid request for the second owner.
const success = await client.multisig.approveTransaction({
  ...pending.request,
  account: owner_2,
})
```

```ts twoslash [multisig.config.ts] filename="multisig.config.ts"
// [!include ~/snippets/tempo/multisig.config.ts:setup]
```
:::

## Best Practices

### Keep the Prepared Request Immutable

Owner and fee-payer signatures cover the prepared transaction fields. Do not change gas, fees,
nonce, validity window, calls, or fee payer after either party signs.

## See More

<Cards>
  <Card icon="lucide:hand-coins" title="Sponsor User Fees" description="Integrate a remote fee-payer service." to="/tempo/guides/sponsor-fees" />

  <Card icon="lucide:send" title="Send Transactions" description="Coordinate independent multisig approvals." to="/tempo/guides/multisig/send" />

  <Card icon="lucide:receipt" title="Tempo Transactions" description="Learn how Tempo transaction fees and fee payers work." to="/tempo/transactions" />
</Cards>