Mode d’emploi
- Copiez la commande et examinez le paquet avant de l’installer dans votre environnement agent.
- Consultez le document original pour les outils, identifiants et environnements requis.
- Décrivez les entrées et le livrable souhaité ; comparez la sortie aux sources.
npx skills add https://github.com/uniswap/uniswap-ai --skill viem-integrationAvant de commencer
- L’installation n’inclut ni abonnement au modèle, ni quota API, ni accès aux fichiers.
- Étoiles et installations reflètent l’activité, pas un test indépendant de qualité ou de sécurité.
Document Skill original
Rendu depuis le dépôt source en conservant titres, exemples, code, tableaux, liens et images.
viem Integration
Integrate EVM blockchains using viem for TypeScript/JavaScript applications.
Quick Decision Guide
| Building... | Use This |
|---|---|
| Node.js script/backend | viem with http transport |
| React/Next.js frontend | wagmi hooks (built on viem) |
| Real-time event monitoring | viem with webSocket transport |
| Browser wallet integration | wagmi or viem custom transport |
Installation
bash
# Core library
npm install viem
# For React apps, also install wagmi
npm install wagmi viem @tanstack/react-queryCore Concepts
Clients
viem uses two client types:
| Client | Purpose | Example Use |
|---|---|---|
| PublicClient | Read-only operations | Get balances, read contracts, fetch logs |
| WalletClient | Write operations | Send transactions, sign messages |
Transports
| Transport | Use Case |
|---|---|
http() | Standard RPC calls (most common) |
webSocket() | Real-time event subscriptions |
custom() | Browser wallets (window.ethereum) |
Chains
viem includes 50+ chain definitions. Import from viem/chains:
typescript
import { mainnet, arbitrum, optimism, base, polygon } from 'viem/chains';Input Validation Rules
Before interpolating ANY user-provided value into generated TypeScript code:
- Ethereum addresses: MUST match
^0x[a-fA-F0-9]{40}$— use viem'sisAddress()for validation - Chain IDs: MUST be from viem's supported chain definitions
- Private keys: MUST NEVER be hardcoded — always use
process.env.PRIVATE_KEYwith runtime validation - RPC URLs: MUST use
https://orwss://protocols only - ABI inputs: Validate types match expected Solidity types before encoding
Quick Start Examples
Read Balance
typescript
import { createPublicClient, http, formatEther } from 'viem';
import { mainnet } from 'viem/chains';
const client = createPublicClient({
chain: mainnet,
transport: http(),
});
const balance = await client.getBalance({
address: '0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045',
});
console.log(`Balance: ${formatEther(balance)} ETH`);Read Contract
typescript
import { createPublicClient, http, parseAbi } from 'viem';
import { mainnet } from 'viem/chains';
const client = createPublicClient({
chain: mainnet,
transport: http(),
});
const abi = parseAbi([
'function balanceOf(address) view returns (uint256)',
'function decimals() view returns (uint8)',
]);
const balance = await client.readContract({
address: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48', // USDC
abi,
functionName: 'balanceOf',
args: ['0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045'],
});Send Transaction
typescript
import { createWalletClient, http, parseEther } from 'viem';
import { privateKeyToAccount } from 'viem/accounts';
import { mainnet } from 'viem/chains';
const account = privateKeyToAccount(process.env.PRIVATE_KEY as `0x${string}`);
const client = createWalletClient({
account,
chain: mainnet,
transport: http(),
});
const hash = await client.sendTransaction({
to: '0x...',
value: parseEther('0.1'),
});
console.log(`Transaction hash: ${hash}`);Write to Contract
typescript
import { createWalletClient, createPublicClient, http, parseAbi, parseUnits } from 'viem';
import { privateKeyToAccount } from 'viem/accounts';
import { mainnet } from 'viem/chains';
const account = privateKeyToAccount(process.env.PRIVATE_KEY as `0x${string}`);
const walletClient = createWalletClient({
account,
chain: mainnet,
transport: http(),
});
const publicClient = createPublicClient({
chain: mainnet,
transport: http(),
});
const abi = parseAbi(['function transfer(address to, uint256 amount) returns (bool)']);
// Simulate first to catch errors
const { request } = await publicClient.simulateContract({
address: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48',
abi,
functionName: 'transfer',
args: ['0x...', parseUnits('100', 6)],
account,
});
// Execute the transaction
const hash = await walletClient.writeContract(request);
// Wait for confirmation
const receipt = await publicClient.waitForTransactionReceipt({ hash });
console.log(`Confirmed in block ${receipt.blockNumber}`);Reference Documentation
For deeper coverage of specific topics:
| Topic | Reference File |
|---|---|
| Client setup, transports, chains | Clients & Transports |
| Reading blockchain data | Reading Data |
| Sending transactions | Writing Transactions |
| Private keys, HD wallets | Accounts & Keys |
| ABI handling, multicall | Contract Patterns |
| React/wagmi hooks | Wagmi React |
Related Plugins
Once you're comfortable with viem basics, the uniswap-trading plugin provides comprehensive Uniswap swap integration:
- Uniswap Trading API integration
- Universal Router SDK usage
- Token swap implementations
Install it with: claude plugin add @uniswap/uniswap-trading
Common Utilities
Unit Conversion
typescript
import { parseEther, formatEther, parseUnits, formatUnits } from 'viem';
// ETH
parseEther('1.5'); // 1500000000000000000n (wei)
formatEther(1500000000000000000n); // "1.5"
// Tokens (e.g., USDC with 6 decimals)
parseUnits('100', 6); // 100000000n
formatUnits(100000000n, 6); // "100"Address Utilities
typescript
import { getAddress, isAddress } from 'viem';
isAddress('0x...'); // true/false
getAddress('0x...'); // checksummed addressHashing
typescript
import { keccak256, toHex } from 'viem';
keccak256(toHex('hello')); // 0x1c8aff950685c2ed4bc3174f3472287b56d9517b9c948127319a09a7a36deac8Error Handling
viem throws typed errors that can be caught and handled:
typescript
import { ContractFunctionExecutionError, InsufficientFundsError } from 'viem'
try {
await client.writeContract(...)
} catch (error) {
if (error instanceof ContractFunctionExecutionError) {
console.error('Contract call failed:', error.shortMessage)
}
if (error instanceof InsufficientFundsError) {
console.error('Not enough ETH for gas')
}
}
