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Covers eth_sendTransaction, personal_sign, eth_signTypedData_v4, scope selection, and RPC routing for read vs sign operations.\n---\n# Sign EVM Transactions via Multichain Client\n\n## When to use\n\nUse this skill when:\n- Sending EVM transactions through `invokeMethod` on a multichain client\n- Signing messages with `personal_sign` or `eth_signTypedData_v4`\n- Understanding which methods route to the RPC node vs the wallet\n- Selecting the correct CAIP-2 EVM scope for a target chain\n\n## Workflow\n\n### Step 1: Ensure the client is connected with EVM scopes\n\n```typescript\nimport { createMultichainClient, getInfuraRpcUrls } from '@metamask\u002Fconnect-multichain';\n\nconst client = await createMultichainClient({\n dapp: { name: 'My DApp', url: window.location.href },\n api: {\n supportedNetworks: {\n ...getInfuraRpcUrls({ infuraApiKey: 'YOUR_INFURA_KEY', caipChainIds: ['eip155:1', 'eip155:137'] }),\n },\n },\n});\n\nawait client.connect(\n ['eip155:1', 'eip155:137'], \u002F\u002F Ethereum mainnet + Polygon\n [],\n);\n```\n\n### Step 2: Understand RPC routing\n\nThe multichain client routes EVM methods based on type:\n\n| Route | Methods | Transport |\n|-------|---------|-----------|\n| **RPC node** | `eth_call`, `eth_getBalance`, `eth_blockNumber`, `eth_getTransactionReceipt`, `eth_estimateGas`, `eth_getCode`, `eth_getLogs`, `eth_getTransactionCount` | Infura \u002F custom RPC URL from `supportedNetworks` |\n| **Wallet** | `eth_sendTransaction`, `personal_sign`, `eth_signTypedData_v4`, `wallet_switchEthereumChain`, `wallet_addEthereumChain` | MetaMask (extension or MWP) |\n\nThe scope in `invokeMethod` determines which chain the request targets. Use `'eip155:1'` for Ethereum mainnet, `'eip155:137'` for Polygon, etc.\n\n### Step 3: Send a transaction (eth_sendTransaction)\n\n```typescript\nconst txHash = await client.invokeMethod({\n scope: 'eip155:1',\n request: {\n method: 'eth_sendTransaction',\n params: [{\n from: '0xYourAddress',\n to: '0xRecipientAddress',\n value: '0x2386F26FC10000', \u002F\u002F 0.01 ETH in hex wei\n gas: '0x5208', \u002F\u002F 21000 gas\n \u002F\u002F gasPrice or maxFeePerGas\u002FmaxPriorityFeePerGas optional\n }],\n },\n});\n\nconsole.log('Transaction hash:', txHash);\n```\n\n**Estimating gas before sending:**\n\n```typescript\nconst gasEstimate = await client.invokeMethod({\n scope: 'eip155:1',\n request: {\n method: 'eth_estimateGas',\n params: [{\n from: '0xYourAddress',\n to: '0xRecipientAddress',\n value: '0x2386F26FC10000',\n }],\n },\n});\n```\n\n### Step 4: Sign a message (personal_sign)\n\nThe message must be hex-encoded. The signer address is the second parameter.\n\n```typescript\nconst message = '0x' + Buffer.from('Hello MetaMask!').toString('hex');\n\nconst signature = await client.invokeMethod({\n scope: 'eip155:1',\n request: {\n method: 'personal_sign',\n params: [message, '0xYourAddress'],\n },\n});\n\nconsole.log('Signature:', signature);\n```\n\n### Step 5: Sign typed data (eth_signTypedData_v4)\n\nPass the signer address as the first parameter and the JSON-stringified typed data as the second.\n\n```typescript\nconst typedData = {\n types: {\n EIP712Domain: [\n { name: 'name', type: 'string' },\n { name: 'version', type: 'string' },\n { name: 'chainId', type: 'uint256' },\n { name: 'verifyingContract', type: 'address' },\n ],\n Mail: [\n { name: 'from', type: 'string' },\n { name: 'to', type: 'string' },\n { name: 'contents', type: 'string' },\n ],\n },\n primaryType: 'Mail',\n domain: {\n name: 'My DApp',\n version: '1',\n chainId: 1,\n verifyingContract: '0xContractAddress',\n },\n message: {\n from: 'Alice',\n to: 'Bob',\n contents: 'Hello!',\n },\n};\n\nconst signature = await client.invokeMethod({\n scope: 'eip155:1',\n request: {\n method: 'eth_signTypedData_v4',\n params: ['0xYourAddress', JSON.stringify(typedData)],\n },\n});\n\nconsole.log('Typed data signature:', signature);\n```\n\n### Step 6: Cross-chain scope selection\n\nEach `invokeMethod` call targets a specific chain via its scope. You do not need to \"switch chains\" — just use the appropriate scope.\n\n```typescript\n\u002F\u002F Send on Polygon\nawait client.invokeMethod({\n scope: 'eip155:137',\n request: {\n method: 'eth_sendTransaction',\n params: [{ from: '0x...', to: '0x...', value: '0xDE0B6B3A7640000' }],\n },\n});\n\n\u002F\u002F Read balance on Ethereum\nconst ethBalance = await client.invokeMethod({\n scope: 'eip155:1',\n request: {\n method: 'eth_getBalance',\n params: ['0xYourAddress', 'latest'],\n },\n});\n\n\u002F\u002F Read balance on Polygon\nconst polyBalance = await client.invokeMethod({\n scope: 'eip155:137',\n request: {\n method: 'eth_getBalance',\n params: ['0xYourAddress', 'latest'],\n },\n});\n```\n\n### Step 7: Error handling for signing\n\n```typescript\ntry {\n const sig = await client.invokeMethod({\n scope: 'eip155:1',\n request: {\n method: 'personal_sign',\n params: [hexMessage, signerAddress],\n },\n });\n} catch (err) {\n \u002F\u002F Multichain invokeMethod errors are wrapped in RPCInvokeMethodErr (code 53);\n \u002F\u002F the wallet's original code is on err.rpcCode\n if (err instanceof RPCInvokeMethodErr && err.rpcCode === 4001) {\n \u002F\u002F User rejected the signing request\n return;\n }\n throw err;\n}\n```\n\n(Import the class with `import { RPCInvokeMethodErr } from '@metamask\u002Fconnect-multichain';`. Revert reasons \u002F custom error bytes from the wallet are available on `err.rpcData`.)\n\n## Important Notes\n\n- **Scope = chain target:** The `scope` field in `invokeMethod` determines which chain the method executes on. Use `'eip155:\u003Cdecimal-chainId>'` format (e.g., `'eip155:1'`, `'eip155:137'`, `'eip155:42161'`).\n- **No chain switching needed:** Unlike single-chain EVM clients, the multichain client does not require `wallet_switchEthereumChain`. Each call specifies its own scope.\n- **Read vs sign routing:** Read-only methods go to the RPC node (fast, no user prompt). 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