Viem

MCPSearch({ query: "select:mcp__plugin_devtools_context7__query-docs" })

// Client patterns
mcp__context7__query_docs({
  context7CompatibleLibraryID: "/wevm/viem",
  topic: "createPublicClient createWalletClient"
})

// Contract interactions
mcp__context7__query_docs({
  context7CompatibleLibraryID: "/wevm/viem",
  topic: "readContract writeContract simulateContract"
})

// Signing
mcp__context7__query_docs({
  context7CompatibleLibraryID: "/wevm/viem",
  topic: "signMessage signTypedData EIP-712"
})

// Encoding
mcp__context7__query_docs({
  context7CompatibleLibraryID: "/wevm/viem",
  topic: "encodeFunctionData decodeFunctionResult encodeAbiParameters"
})

import { createPublicClient, createWalletClient, http } from "viem";
import { mainnet } from "viem/chains";
import { privateKeyToAccount } from "viem/accounts";

const publicClient = createPublicClient({
  chain: mainnet,
  transport: http(),
});

const walletClient = createWalletClient({
  chain: mainnet,
  transport: http(),
  account: privateKeyToAccount("0x..."),
});

Read contract:

const balance = await publicClient.readContract({
  address: "0x...",
  abi: erc20Abi,
  functionName: "balanceOf",
  args: [userAddress],
});

Write contract:

const hash = await walletClient.writeContract({
  address: "0x...",
  abi: erc20Abi,
  functionName: "transfer",
  args: [recipient, amount],
});

const receipt = await publicClient.waitForTransactionReceipt({ hash });

import { parseEther, formatEther, parseUnits, formatUnits } from "viem";

parseEther("1.5");           // 1500000000000000000n
formatEther(1500000000000000000n);  // "1.5"
parseUnits("100", 6);        // 100000000n (USDC)
formatUnits(100000000n, 6);  // "100"

Address utilities:

import { getAddress, isAddress } from "viem";

getAddress("0xabc...");  // Checksummed address
isAddress("0x...");      // Validates format

Required:

• Lazy initialization for chain resolution
• Client caching by network name
• WebSocket cleanup on destroy/refresh
• Type-safe ABI interactions