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# getInitialDepositAmount

Reads the initial deposit amount registered for an asset in the AssetRegistry.

Every factory spawn (`spawnConduit`, `spawnMultiVehicle`, `spawnAaveV3Vehicle`) pulls this amount
from the caller — the amount is not a parameter of the spawn, it comes from the registry. Approve
the factory for at least this much, and hold at least this much, or the spawn reverts with
`InsufficientAllowance` / `InsufficientAssetBalance`.

## Import

```ts
import { getInitialDepositAmount } from '@railnetorg/railnet-sdk'
```

## Usage

```ts
import { createPublicClient, http } from 'viem'
import { base } from 'viem/chains'
import { getAddresses, getInitialDepositAmount } from '@railnetorg/railnet-sdk'

const publicClient = createPublicClient({
  chain: base,
  transport: http(),
})

const { assetRegistry, usdc } = getAddresses(base.id)

const amount = await getInitialDepositAmount(publicClient, {
  assetRegistry,
  asset: usdc,
})
```

Approving the factory before a spawn:

```ts
import { erc20Abi } from 'viem'
import { getAddresses, getInitialDepositAmount, spawnConduit } from '@railnetorg/railnet-sdk'

const account = '0xd2135CfB216b74109775236E36d4b433F1DF507B'
const { assetRegistry, conduitFactory, usdc } = getAddresses(base.id)

const amount = await getInitialDepositAmount(walletClient, { assetRegistry, asset: usdc })

await walletClient.writeContract({
  address: usdc,
  abi: erc20Abi,
  functionName: 'approve',
  args: [conduitFactory, amount],
  account,
})

const hash = await spawnConduit(walletClient, {
  factory: conduitFactory,
  // ...
  account,
})
```

The [`deployMultiVehicle`](/workflows/deployMultiVehicle) workflow does this for you.

## Returns

`bigint`

The initial deposit amount, in the asset's own decimals. `0n` means the asset has no registered
config — the spawn will revert, since the factories require a non-zero amount.

## Parameters

### assetRegistry

* **Type:** `Address`

The AssetRegistry contract address. Available as `assetRegistry` from [`getAddresses`](/contracts/getAddresses).

```ts
const amount = await getInitialDepositAmount(publicClient, {
  assetRegistry: '0xefdB0D96F9dce67b95200E9D9be46e0fA18b7042', // [!code focus]
  asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913',
})
```

### asset

* **Type:** `Address`

The asset to look up — the underlying asset of the conduit or vehicle you are about to spawn.

```ts
const amount = await getInitialDepositAmount(publicClient, {
  assetRegistry: '0x...',
  asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913', // [!code focus]
})
```