Custom Crypto Payroll System Development for Businesses

Case: How we solved batch payments for a 30-person startup

A startup with a distributed team wanted to pay in USDC on Polygon, but each manual payment via multisig took hours. For a team of 30 people, gas savings using batch payments can reach up to $1500 per month. Batch payments through a multisend contract reduce costs by 3-5x. Custom development makes sense when the team has more than 20 people, has non-standard token requirements, or needs integration with an HR system. Ready-made solutions like Request Finance or Superfluid don't always cover the specifics, so we offer custom turnkey development.

We use a proven stack: Solidity 0.8.x for smart contracts, Foundry for testing, TypeScript for backend, Safe SDK for multisig. With over 10 projects in crypto payment automation, we guarantee compliance with security standards and regulatory requirements.

How to choose the rate conversion method?

The most painful question is which exchange rate to use. Three options:

Spot rate at payment time is the simplest. The employer takes the rate at the moment of sending the transaction. The employee bears the volatility risk.

Fixed rate N days before payment reduces volatility but requires advance planning and may diverge from the market rate at payment time.

TWA (Time-Weighted Average) over the calculation period is a standard in traditional FX calculations, most fair but harder to explain to employees.

class ExchangeRateService { private sources = [ new ChainlinkPriceFeed(), new CoinGeckoAPI(), new BinanceAPI(), ] async getRate( fromCurrency: string, toCurrency: string, method: 'spot' | 'twap_7d' | 'twap_30d' = 'spot' ): Promise<{ rate: Decimal; source: string; timestamp: Date }> { if (method === 'spot') { for (const source of this.sources) { try { const rate = await source.getSpotRate(fromCurrency, toCurrency) return { rate, source: source.name, timestamp: new Date() } } catch (e) { console.warn(`${source.name} failed:`, e) } } throw new Error(`Cannot get spot rate for ${fromCurrency}/${toCurrency}`) } const days = method === 'twap_7d' ? 7 : 30 const historicalRates = await this.getHistoricalRates(fromCurrency, toCurrency, days) const avgRate = historicalRates.reduce((sum, r) => sum.plus(r), new Decimal(0)) .div(historicalRates.length) return { rate: avgRate, source: 'twap', timestamp: new Date() } } async snapshotForPayroll(run: PayrollRun): Promise<ExchangeRateSnapshot[]> { const tokens = new Set( run.employees.flatMap(e => e.payments.map(p => p.token)) ) const snapshots = await Promise.all( [...tokens].map(async (token) => { const rate = await this.getRate(run.currency, token, 'spot') return { token, ...rate, payrollRunId: run.id } }) ) await this.db.insertRateSnapshots(snapshots) return snapshots } } 

Why batch payments save gas?

On Ethereum mainnet, paying each employee with a separate transaction is expensive. For a team of 30 people, gas savings using batch payments can be up to $1500 per month. Batch payments through a multisend contract reduce costs by 3-5x:

// SPDX-License-Identifier: MIT pragma solidity ^0.8.19; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; contract PayrollDispatcher is Ownable { event PaymentDispatched( bytes32 indexed payrollRunId, address indexed recipient, address indexed token, uint256 amount ); struct Payment { address recipient; address token; uint256 amount; } function dispatchPayroll( bytes32 payrollRunId, Payment[] calldata payments ) external onlyOwner { for (uint256 i = 0; i < payments.length; i++) { Payment calldata p = payments[i]; if (p.token == address(0)) { (bool success,) = p.recipient.call{value: p.amount}(""); require(success, "ETH transfer failed"); } else { require( IERC20(p.token).transferFrom(msg.sender, p.recipient, p.amount), "Token transfer failed" ); } emit PaymentDispatched(payrollRunId, p.recipient, p.token, p.amount); } } receive() external payable {} } 

For stablecoins (USDC, USDT) we use transferFrom — the source of funds remains on the multisig wallet, the contract only directs payments. This is important for security: the contract does not hold funds.

Multi-chain disbursement

If employees receive salaries in different networks, a separate disbursement module for each network is needed. Parallel execution with status aggregation:

class MultiChainDisbursementService { private dispatchers: Map<string, ChainDispatcher> async executePayrollRun(run: PayrollRun): Promise<DisbursementResult> { const byChain = groupBy( run.employees.flatMap(e => e.payments), p => p.chain ) const results = await Promise.allSettled( Object.entries(byChain).map(([chain, payments]) => this.dispatchers.get(chain)!.dispatch(run.id, payments) ) ) const failures = results.filter(r => r.status === 'rejected') if (failures.length > 0) { await this.handlePartialFailure(run.id, failures) } return this.aggregateResults(results) } } 

Multi-sig authorization

For funds with AML requirements, a single signature under a payment is not enough. Standard scheme: CFO + CEO + financial director, 2-of-3.

Safe{Wallet} is the standard for multisig operations. Integration via Safe SDK:

import Safe, { EthersAdapter } from '@safe-global/protocol-kit' import SafeApiKit from '@safe-global/api-kit' class PayrollApprovalService { async proposePayrollTransaction( safeAddress: string, payrollData: PayrollRun, payments: BatchPayment[] ): Promise<string> { const safeSDK = await Safe.create({ ethAdapter, safeAddress }) const apiKit = new SafeApiKit({ txServiceUrl: 'https://safe-transaction-mainnet.safe.global' }) const data = payrollDispatcher.interface.encodeFunctionData( 'dispatchPayroll', [payrollData.id, payments] ) const safeTransaction = await safeSDK.createTransaction({ transactions: [{ to: PAYROLL_DISPATCHER_ADDRESS, data, value: '0' }] }) const safeTxHash = await safeSDK.getTransactionHash(safeTransaction) const senderSignature = await safeSDK.signTransactionHash(safeTxHash) await apiKit.proposeTransaction({ safeAddress, safeTransactionData: safeTransaction.data, safeTxHash, senderAddress: await signer.getAddress(), senderSignature: senderSignature.data, }) return safeTxHash } } 

Tax accounting and compliance

Each payment must be recorded with:

• Fiat equivalent at the time of payment (for income tax)
• Source of the rate (for audit)
• On-chain transaction identifier
• Period for which it was paid

CREATE TABLE payroll_transactions ( id BIGSERIAL PRIMARY KEY, payroll_run_id UUID NOT NULL REFERENCES payroll_runs(id), employee_id UUID NOT NULL REFERENCES employees(id), payment_date DATE NOT NULL, period_start DATE NOT NULL, period_end DATE NOT NULL, token_address VARCHAR(42) NOT NULL, token_symbol VARCHAR(20) NOT NULL, chain VARCHAR(50) NOT NULL, crypto_amount NUMERIC(36, 18) NOT NULL, tx_hash VARCHAR(66), fiat_currency VARCHAR(3) NOT NULL, fiat_amount NUMERIC(20, 2) NOT NULL, exchange_rate NUMERIC(20, 8) NOT NULL, rate_source VARCHAR(100) NOT NULL, rate_timestamp TIMESTAMPTZ NOT NULL, status VARCHAR(20) NOT NULL DEFAULT 'pending', confirmed_at TIMESTAMPTZ, block_number BIGINT ); 

Export for accounting: CSV breakdown by employee and period, compatible with 1C or international standards (IAS 19 for employee benefits). Contact us — we will provide an export template tailored to your accounting system.

Streaming payments: Superfluid integration

For DAOs and companies with real-time salary flow — integration with Superfluid Protocol. Instead of periodic payments — a continuous stream of tokens per second:

import { Framework } from '@superfluid-finance/sdk-core' async function createSalaryStream( employeeAddress: string, tokenAddress: string, monthlyAmountWei: bigint ): Promise<void> { const sf = await Framework.create({ chainId: 137, provider }) const superToken = await sf.loadSuperToken(tokenAddress) const flowRate = monthlyAmountWei / BigInt(30 * 24 * 3600) const createFlowOp = superToken.createFlow({ sender: companyAddress, receiver: employeeAddress, flowRate: flowRate.toString(), }) await createFlowOp.exec(signer) } 

Streaming payments eliminate periodicity and reduce operational load, but require sufficient liquidity buffer and complicate tax accounting — income accrues continuously.

What is included in the work

Turnkey system development includes:

• Audit of current payment processes and compliance requirements
• Architecture design and data model
• Smart contract and backend development
• Integration with multisig wallets (Safe) and oracles (Chainlink)
• Setup of tax module and export to accounting systems
• Testing (unit, integration, audit)
• Documentation, team training, post-launch support

A full system with multi-chain support, Safe integration, tax module, and HR integration — from 3 to 6 weeks of development depending on the number of supported networks and compliance requirements. Cost is calculated individually after an audit.

If you need a turnkey crypto payroll system, contact us — we will assess your project and propose a solution. Our experience — over 5 years in blockchain development, certified specialists in Solidity and Rust, guarantee of security and regulatory compliance. Get a consultation — let's discuss the details of your project.