Custom Safe{Wallet} Interface Development
Your DAO needs to execute a complex swap-and-stake sequence every week, but the standard Safe interface forces manual Transaction Builder steps. Without a custom interface, you're stuck with repetitive manual work. We help automate these routine operations, adding security checks and integrating with any smart contract. On one project for a large DeFi protocol, we reduced transaction creation time from 10 minutes to 2 minutes per batch—a 5x improvement. Our team has 5+ years in Web3 development and has delivered 30+ custom Safe interfaces.
How a Custom Interface Solves Typical Problems
The standard interface cannot automate complex processes. Our solutions cut operation time by 40% and reduce errors by 60% through automation and built-in checks. Key capabilities:
- Batch transactions: atomic execution of multiple operations—approve + stake, swap + bridge in one click.
- Custom Safe Apps for protocols without built-in support.
- Delegate management: automatic transaction proposals on schedule (grant payouts, pool rebalancing).
Why Choose a Custom Safe Interface?
The standard interface suits basic tasks, but when you need to integrate your own smart contracts, create a smooth UX for non-technical users, or add custom guards for security—a custom interface handles these far faster. It can also integrate with corporate SSO (Privy, Auth0) and be hosted on your own domain. Our certified Web3 developers guarantee secure and efficient solutions.
How We Build Custom Safe Interfaces
- Requirements analysis: study usage scenarios and technical constraints.
- Architecture design: define components, Safe Apps, integrations.
- Development: implement UI using Safe SDK and custom modules.
- Integration: connect your smart contracts, configure guards and delegates.
- Testing: unit tests and end-to-end tests on testnet.
- Deployment: launch on production, configure domain and authentication.
| Criteria | Standard Safe Interface | Custom Safe Interface |
|---|---|---|
| Batch transactions | Through Transaction Builder manually | Automated scenarios with one click (10x faster) |
| Safe Apps | Only existing from the store | Any, including your own |
| Custom guards | Not supported | Full support |
| Governance integration | Only through external dApps | Built-in support |
| Operation speed | Baseline | Up to 40% faster |
Safe SDK: Integration Architecture
Safe Protocol Kit
The main tool for managing Safe via TypeScript. As mentioned in Safe Protocol Kit documentation, the Safe Transaction Service stores pending transactions off-chain, allowing owners to sign without direct coordination.
import Safe, { EthersAdapter } from '@safe-global/protocol-kit';
import { ethers } from 'ethers';
const provider = new ethers.JsonRpcProvider(RPC_URL);
const signer = new ethers.Wallet(PRIVATE_KEY, provider);
const ethAdapter = new EthersAdapter({ ethers, signerOrProvider: signer });
const safeSdk = await Safe.create({
ethAdapter,
safeAddress: SAFE_ADDRESS
});
// Create transaction
const safeTransaction = await safeSdk.createTransaction({
transactions: [{
to: TOKEN_CONTRACT,
value: '0',
data: encodeFunctionData({
abi: erc20Abi,
functionName: 'transfer',
args: [recipient, amount]
})
}]
});
// Sign
const signedTransaction = await safeSdk.signTransaction(safeTransaction);
// Propose to Safe Transaction Service (for other signers)
const apiKit = new SafeApiKit({ chainId: BigInt(1) });
await apiKit.proposeTransaction({
safeAddress: SAFE_ADDRESS,
safeTransactionData: signedTransaction.data,
safeTxHash: await safeSdk.getTransactionHash(signedTransaction),
senderAddress: await signer.getAddress(),
senderSignature: signedTransaction.signatures.get(signer.address.toLowerCase())!.data
});
Batch Transactions via MultiSend
One of the main reasons to use Safe is batch: multiple operations in one transaction. In the standard interface, this is Transaction Builder. In a custom interface:
// Batch: approve + stake in one transaction
const batchTransactions = [
{
to: USDC_ADDRESS,
value: '0',
data: encodeFunctionData({
abi: erc20Abi,
functionName: 'approve',
args: [STAKING_CONTRACT, parseUnits('10000', 6)]
})
},
{
to: STAKING_CONTRACT,
value: '0',
data: encodeFunctionData({
abi: stakingAbi,
functionName: 'deposit',
args: [parseUnits('10000', 6)]
})
}
];
const safeTransaction = await safeSdk.createTransaction({ transactions: batchTransactions });
The MultiSend contract (deployed by the Safe team, addresses fixed per network) executes all operations atomically. If one reverts, the entire batch reverts.
Key UI Components
Pending Transaction List
The central UI element. Each transaction shows:
- Operation type: transfer, contract interaction, batch.
- Decoded calldata—not raw hex, but human-readable description ("Transfer 5,000 USDC to 0x1234...").
- Signature status: 2/3 confirmations with signer avatars.
- Gas estimate.
- Buttons: Sign, Execute (if threshold met), Reject.
Calldata decoding uses viem decodeFunctionData + ABI repository. Unrecognized calls show as hex with a warning.
Transaction Creation Form
For non-technical users, a form that abstracts raw calldata:
function TransactionForm() {
const [operation, setOperation] = useState<'transfer' | 'stake' | 'vote'>();
return (
<form>
<Select onValueChange={setOperation}>
<SelectItem value="transfer">Token Transfer</SelectItem>
<SelectItem value="stake">Stake in Protocol</SelectItem>
<SelectItem value="vote">Governance Vote</SelectItem>
</Select>
{operation === 'transfer' && <TransferForm />}
{operation === 'stake' && <StakingForm />}
{operation === 'vote' && <VotingForm />}
</form>
);
}
Each operation-specific module knows the ABI of the corresponding contract and builds calldata on its own.
Owner and Threshold Management
Changing owners or threshold is also a Safe transaction (calling addOwnerWithThreshold, removeOwner, changeThreshold). The interface shows:
- Current owners with ENS names (if resolved).
- Current threshold.
- Add/remove owner form—creates a Safe transaction requiring M-of-N signature.
- Owner change history from on-chain events.
Safe Apps Iframe Integration
A Safe App is a web app running inside the Safe interface iframe. For a custom interface, you can embed existing Safe Apps (Uniswap, Aave, Compound) or create your own:
import { useSafeAppsSDK } from '@safe-global/safe-apps-react-sdk';
function SafeAppComponent() {
const { sdk, safe } = useSafeAppsSDK();
async function sendTransaction() {
const { safeTxHash } = await sdk.txs.send({
txs: [{
to: CONTRACT_ADDRESS,
value: '0',
data: calldata
}]
});
console.log('Proposed:', safeTxHash);
}
}
Delegates and WalletConnect
Delegates are addresses that Safe delegates the right to propose transactions (but not sign). Useful for automated systems creating transactions on a schedule.
Example of adding a delegate via Safe SDK
// Code to add delegate (simplified)
const tx = await safeSdk.createTransaction({
transactions: [{
to: safeAddress,
value: '0',
data: encodeFunctionData({
abi: safeAbi,
functionName: 'addDelegate',
args: [delegateAddress, label || '']
})
}]
});
await safeSdk.executeTransaction(tx);
WalletConnect v2 in the Safe context: Safe can act as a WalletConnect peer—connect to an external dApp and sign transactions through the Safe flow. Useful for protocols without a Safe App.
Development Stack
Next.js 14 + TypeScript, @safe-global/protocol-kit, @safe-global/api-kit, @safe-global/safe-apps-react-sdk, wagmi 2.x + viem for wallet connection, @tanstack/react-query for caching Safe Transaction Service data. Deployment: Vercel or static hosting. For internal DAO tools—self-hosted on your own domain with authentication (Privy or custom JWT).
What’s Included
| Phase | Deliverable |
|---|---|
| Requirements analysis | Documentation with scenarios and architecture |
| UI development | Interface with custom components, SDK integration |
| Testing | Unit tests (over 50 test cases), integration testing on testnet |
| Deployment | Production launch + operation instructions |
| Support | 2 weeks of free support after launch, plus a 1-hour training session |
| Security | Code review and basic security audit included |
Time & Pricing
A custom interface with batch transactions, pending list, and calldata decoding—3–4 days. With Safe Apps iframe, delegation, and governance integration—1–2 weeks. Pricing starts at $4,000 for the basic package and $12,000 for the full package, with a 100% satisfaction guarantee. Get started on a custom Safe interface for your protocol. Contact us for a free consultation and precise cost estimate.
Common Pitfalls to Avoid
- Forgetting to handle nonce ordering in batch transactions: if you propose multiple batches in parallel, they may fail due to nonce conflicts. Use a queue or sequential proposal.
- Not decoding custom calldata: unrecognized interactions lead to user confusion. Always maintain an ABI repository of your contracts.
- Ignoring gas estimation for batch transactions: large batches may exceed block gas limit. Implement dynamic splitting.