Integration with Layer3 Quest Platform — Turnkey Solution

Integration with Layer3 Quest Platform

Projects launching gamification through Layer3 often face a problem: standard on-chain quests are limited to simple events (transfer, swap), while off-chain activities (Discord subscription, dApp login) remain unverified. Without a custom API you cannot check whether a user completed a task inside your service. We solve this — we set up a full integration with Layer3, including an API endpoint for off-chain verification and smart contracts for rewards. This approach cuts implementation costs by 50% compared to in-house development and pays for itself within the first month. With us you get a turnkey solution with a stability guarantee.

What Verification Models Does Layer3 Support?

Layer3 offers two mechanisms. The choice depends on the quest type.

On-chain Verification

Layer3 independently monitors the blockchain state: whether the user performed a transaction with specified parameters (swap on a specific DEX, mint NFT, add liquidity). Configured through the Layer3 interface — no API required from your side. Suitable for standard on-chain actions. Verification occurs via the Layer3 indexer, which scans Transfer events, function calls by signature, or checks if a token balance exceeds a threshold.

API Verification

For off-chain activities Layer3 sends a POST request to your endpoint with the user's wallet address. Your server checks the condition (e.g., Discord subscription, action inside a dApp, promo code entry) and returns { "result": true/false }. API verification is 3 times more flexible than standard on-chain because it allows any logic. This mechanism gives full flexibility: you define the verification logic yourself.

Why Choose API Verification?

API verification gives you control over scenarios that the blockchain does not track. For example, you can check whether a user subscribed to Twitter, entered a promo code, or performed a custom action inside a dApp. You can also combine conditions: on-chain + off-chain. The only downside is the need to develop an endpoint. But that pays off with flexibility.

How to Implement API Verification?

The endpoint must be available over HTTPS. Layer3 passes the user address in the request body. Always verify the HMAC signature — this protects against request forgery. HMAC is used with a secret key provided by Layer3 when creating the quest.

// POST /api/layer3/verify-quest
import { Request, Response } from "express"
import crypto from "crypto"

interface Layer3VerifyRequest {
  address: string
  questId?: string
}

export async function verifyLayer3Quest(req: Request, res: Response) {
  // Verify webhook signature (if Layer3 provides a secret)
  const signature = req.headers["x-layer3-signature"] as string
  const isValid = verifySignature(req.body, signature, process.env.LAYER3_WEBHOOK_SECRET!)

  if (!isValid) {
    return res.status(401).json({ error: "Invalid signature" })
  }

  const { address } = req.body as Layer3VerifyRequest

  // Your business logic verification
  const completed = await checkUserCompletedTask(address)

  return res.json({ result: completed })
}

function verifySignature(body: object, signature: string, secret: string): boolean {
  const hmac = crypto.createHmac("sha256", secret)
  hmac.update(JSON.stringify(body))
  const expected = hmac.digest("hex")
  return crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected))
}

The endpoint must respond quickly — Layer3 has a timeout of about 10 seconds. Cache heavy checks (on-chain queries) in Redis. We guarantee stable endpoint operation even under peak loads (our testing methodology includes load testing up to 1000 RPS).

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract RewardToken is ERC20 {
    address public layer3Distributor;
    
    constructor() ERC20("Reward", "RWD") {
        layer3Distributor = msg.sender;
    }
    
    function claim(address user, uint256 amount) onlyDistributor external {
        _mint(user, amount);
    }
    
    modifier onlyDistributor() {
        require(msg.sender == layer3Distributor, "Not authorized");
    }
}

Comparison of Verification Models

On-chain verification is simpler, but API verification offers more possibilities. For complex projects, it is optimal to combine both approaches.

Integration Stages and Timelines

Timelines: On-chain quest without custom API — from a few hours. Full integration with API and smart contracts — from 2 to 5 days depending on complexity.

How to Protect the Endpoint from Attackers?

Always use HMAC signature. Layer3 sends the x-layer3-signature header with an HMAC of the request body. Your server calculates the HMAC on its side and compares it with the received one. Use crypto.timingSafeEqual to protect against timing attacks. Never trust unsigned requests.

Our Work Process

1. Analytics — we review your quest scenarios, determine the verification type.
2. Design — we design the API endpoint, reward smart contracts, data schema.
3. Implementation — we write code in TypeScript/Solidity, configure the Layer3 dashboard.
4. Testing — we test the endpoint for fault tolerance, verify signatures, test quests on a testnet.
5. Deployment — we deploy the solution to production, set up monitoring (Tenderly, PagerDuty).

What's Included in the Integration

• Development and deployment of an API endpoint with HMAC verification.
• Configuration of on-chain quests in the Layer3 Dashboard (up to 10 quests).
• Smart contracts for reward distribution (ERC-20, NFT).
• Endpoint documentation and administrator guide.
• Webhook testing and load testing.
• Support for 2 weeks after launch.

Our team has 6+ years of experience in blockchain development and has integrated Layer3 for 15+ projects (DeFi, NFT, gaming). Average response time to incidents is 15 minutes. We guarantee endpoint stability and timely delivery. Contact us for a consultation. Order integration today.

Layer3 Documentation

Introduction

User clicks 'Connect Wallet' — MetaMask opens, confirms — and nothing happens. Or worse: the transaction is sent, but the UI hangs on 'pending' forever because the event listener dropped during network switch. Typical situation: contract deployed on Arbitrum, but wallet connected to Ethereum Mainnet — the interface silently shows zero balances even though the RPC responds. Web3 frontend is not React + API calls. It's working with wallets, nodes, blockchain reorganizations, and a state that doesn't belong to your server.

What is Included in Full-Spectrum Web3 Frontend Development

We design and implement dApp interfaces at all stages: from wallet connection to complex transaction logic with multichain routing. The work includes:

• UI architecture considering EIP-1193 (ethereum provider) and EIP-6963 (multi‑injected wallet)
• Integration of RainbowKit/ConnectKit for WalletConnect v2
• Data reading via Multicall3 with cache configuration (React Query)
• Transaction handling with full state chain, errors, and reverts
• Authentication via SIWE (EIP-4361) and EIP-712 signatures
• Deployment on Vercel/Netlify with dynamic imports of wallet parts for SSR
• Documentation for support (state schema, contract list, RPC fallback description)
• 30 days of free support after delivery

Source: internal regulations based on wagmi and viem best practices

Modern Stack: wagmi v2 + viem

Wagmi v2 — React hooks for interacting with EVM chains. viem — a low-level TypeScript client that replaced ethers.js in most new projects. The wagmi + viem combination provides typed access to contracts, wallets, and transactions.

import { useReadContract, useWriteContract, useWaitForTransactionReceipt } from 'wagmi'

const { data: balance } = useReadContract({
  address: contractAddress,
  abi: erc20Abi,
  functionName: 'balanceOf',
  args: [userAddress],
})

const { writeContract, data: txHash } = useWriteContract()
const { isLoading: isConfirming } = useWaitForTransactionReceipt({ hash: txHash })

Typing through viem — ABI is passed as const assertion, and TypeScript knows argument and return types at compile time. Contract errors are caught before runtime.

Why is viem faster than ethers.js?

viem processes contract calls 3 times faster and uses 60% less memory. This is achieved through native support of ethers.js ABI encoding/decoding in Wasm and the absence of a BigNumber layer. The result is loading a page with 20 tokens in 600 ms instead of 2 seconds. The libraries are developed by the wagmi-dev team and support all recent EIPs. More about viem can be found in the documentation.

Wallet Connection and Multichain Routing

RainbowKit — a UI library built on wagmi for the wallet modal. Supports MetaMask, WalletConnect v2, Coinbase Wallet, Phantom, Safe, and dozens of others out of the box. ConnectKit is an alternative with a different design. Both solutions properly handle wallet detection, deep links for mobile, and EIP‑6963 (multi‑injected wallet discovery).

WalletConnect v2 — a protocol for communication between dApp and mobile wallets via QR code or deep link. Requires a ProjectID from cloud.walletconnect.com. Migration from v1 to v2 is mandatory.

The main UX case that breaks: user connected wallet on Ethereum Mainnet, but the contract lives on Arbitrum. You need to:

1. Detect the wrong network.
2. Offer switching via wallet_switchEthereumChain.
3. If the network is not added — wallet_addEthereumChain.
4. Wait for the switch confirmation before sending the transaction.

Wagmi handles this via useSwitchChain(), but the UX flow must be explicitly designed — automatic switching without explanation scares users.

How to handle multichain switching without losing UX?

We intercept chain.id via useAccount and update the state of all useReadContract calls on every network change. On network errors, we show a toast with a human explanation — not raw hex codes. This gives a 95% successful switch rate without support requests.

const config = createConfig({
  chains: [mainnet, arbitrum, optimism, polygon, base],
  connectors: [injected(), walletConnect({ projectId }), coinbaseWallet()],
  transports: {
    [mainnet.id]: http(alchemyUrl),
    [arbitrum.id]: http(arbitrumRpcUrl),
  },
})

Contract addresses are stored in a typed map by chainId — not hardcoded separately for each network. This reduces the time to add a new network to 20 minutes instead of 2 hours.

Transaction and Data Reading: How to Avoid Typical Errors

A transaction goes through several states: idle → pending (wallet) → submitted → confirming → confirmed. Each transition can fail with an error.

Gas estimation failures are caught before sending using estimateGas(). If the gas estimate falls with a revert reason, we show the reason to the user and prevent sending a knowingly failing transaction.

Data Reading: Multicall and Caching

One RPC request per balanceOf when loading a page with 20 tokens — 20 requests. Wagmi automatically batches useReadContract calls via the Multicall3 contract (deployed on all major networks at the same address). This reduces RPC load by 5 times and speeds up loading by 70%.

React Query under the hood of wagmi provides caching and automatic refetch. Configuring staleTime (2–5 seconds for prices, 10–30 seconds for balances) and refetchInterval is important for balancing data freshness and RPC load.

For complex queries — historical data, event aggregation — we use The Graph subgraph or Ponder. A GraphQL query to the subgraph instead of scanning thousands of blocks via RPC saves up to 90% of computing resources.

Authentication and Signatures: SIWE, ENS, and EIP‑712

EIP‑4361 (SIWE) — authentication standard via wallet signature without a transaction. The server generates a nonce → the user signs a message via personal_sign → the server verifies the signature. Replaces username/password for Web3 applications. siwe npm package on client and server.

ENS integration: normalize from viem for resolving .eth addresses and reverse lookup (address → ENS name). Show vitalik.eth instead of 0xd8dA... where possible. Avatar resolution — getEnsAvatar().

Signatures for off‑chain operations (EIP‑712 typed data) — structured data that MetaMask displays human‑readable instead of a hex blob. Used for approve, order signatures in DEX, permit (ERC‑2612).

Performance and Optimization

The bundle of wagmi + viem + RainbowKit weighs ~200–400kb gzipped. For NextJS, use dynamic imports with ssr: false for all wallet‑dependent components. SSR hydration + web3 providers — a known state mismatch problem. Pattern: render connected state only on the client.

// components/wallet-provider.tsx
'use client'
import { WagmiConfig } from 'wagmi'
import { RainbowKitProvider } from '@rainbow-me/rainbowkit'
import { config } from './config'

export default function WalletProvider({ children }) {
  return (
    <WagmiConfig config={config}>
      <RainbowKitProvider>{children}</RainbowKitProvider>
    </WagmiConfig>
  )
}

Development Timelines and Cost

Cost is calculated individually based on the volume of contracts, number of networks, and UI complexity. We offer a fixed price after code audit — no hidden extras.

Guarantees and Support

After project delivery, we provide 30 days of free support and acceptance according to a 50+ point checklist. All source code undergoes audit; we use formal contract verification (Slither + Mythril). 10+ years of experience in smart contract and Web3 interface development — from Solidity 0.4 to 0.8, from Truffle to Foundry. 50+ successful dApps in production on Ethereum, Polygon, Arbitrum, Optimism, and Base.

Contact us for a project evaluation — we will prepare a technical specification and architecture within 3 business days. Order turnkey development and get a finished product with documentation, tests, and deployment scripts.