fund

fund(client, options): Promise<`0x${string}`>

Defined in: packages/synapse-core/src/pay/fund.ts:72

Smart deposit that picks the right contract call based on FWSS approval state

Routes to the appropriate action based on current state:

• Needs approval + amount > 0: depositAndApprove (deposit with permit + approve FWSS operator)
• Needs approval + amount === 0: setOperatorApproval (approve FWSS operator only)
• Already approved + amount > 0: depositWithPermit (deposit only via permit)
• Already approved + amount === 0: throws (nothing to do)

Parameters

Parameter	Type	Description
client	Client<Transport, Chain, Account>	The viem client with account to use for the transaction.
options	OptionsType	fund.OptionsType

Returns

Promise<`0x${string}`>

The transaction hash

Throws

Errors fund.ErrorType

Example

import { fund } from '@filoz/synapse-core/pay'
import { createWalletClient, http, parseUnits } from 'viem'
import { privateKeyToAccount } from 'viem/accounts'
import { calibration } from '@filoz/synapse-core/chains'

const account = privateKeyToAccount('0x...')
const client = createWalletClient({
  account,
  chain: calibration,
  transport: http(),
})

// Deposit 100 USDFC (auto-detects approval state)
const hash = await fund(client, {
  amount: parseUnits('100', 18),
})

console.log(hash)