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Covers signTransaction, signAndSendTransaction, signMessage, building transactions with @solana\u002Fweb3.js, base64 encoding, mainnet\u002Fdevnet scopes, and selective disconnect.\n---\n# Sign Solana Transactions via Multichain Client\n\n## When to use\n\nUse this skill when:\n- Signing or sending Solana transactions through `invokeMethod` on a multichain client\n- Building Solana transactions with `@solana\u002Fweb3.js` and encoding them for the multichain API\n- Signing Solana messages through the multichain client\n- Selecting the correct Solana CAIP-2 scope (mainnet, devnet)\n- Disconnecting only Solana scopes while keeping EVM sessions active\n\n## Workflow\n\n### Step 1: Connect with Solana 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', 'solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp'] }),\n },\n },\n});\n\nawait client.connect(\n [\n 'eip155:1',\n 'solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp', \u002F\u002F mainnet\n ],\n [],\n); \u002F\u002F resolves with no value — read session via client.provider.getSession()\n```\n\n**Solana CAIP-2 scope identifiers:**\n\n| Network | CAIP-2 Scope |\n|----------|-------------|\n| Mainnet | `solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp` |\n| Devnet | `solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1` |\n| Testnet | `solana:4uhcVJyU9pJkvQyS88uRDiswHXSCkY3z` |\n\nAll three Solana scopes are modeled by the SDK; non-mainnet availability depends on the connected MetaMask build\u002Fversion, so handle connection errors rather than assuming a cluster is present.\n\n### Step 2: Understand Solana RPC routing\n\n**All Solana methods route through the wallet.** Unlike EVM where read calls go to an RPC node, every Solana `invokeMethod` call is handled by MetaMask. There is no RPC node fallback for Solana.\n\n### Step 3: Sign a message (signMessage)\n\nMethod names have **no `solana_` prefix**. The message must be **base64 encoded**, and the signing account is passed as `account: { address }`.\n\n```typescript\nconst message = btoa('Hello from Solana via MetaMask!');\n\nconst result = await client.invokeMethod({\n scope: 'solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp',\n request: {\n method: 'signMessage',\n params: {\n account: { address: 'YourSolanaAddressBase58' },\n message,\n },\n },\n});\n\n\u002F\u002F result: { signature: \u003Cbase58 string>, signedMessage: \u003Cbase64>, signatureType: 'ed25519' }\nconsole.log('Signature:', result.signature);\n```\n\n### Step 4: Build a Solana transaction with @solana\u002Fweb3.js\n\nBuild the transaction using `@solana\u002Fweb3.js`, serialize it, then base64-encode for `invokeMethod`.\n\n```typescript\nimport {\n Connection,\n PublicKey,\n SystemProgram,\n Transaction,\n clusterApiUrl,\n} from '@solana\u002Fweb3.js';\n\nconst connection = new Connection(clusterApiUrl('mainnet-beta'));\nconst fromPubkey = new PublicKey('YourSolanaPublicKey');\nconst toPubkey = new PublicKey('RecipientSolanaPublicKey');\n\nconst transaction = new Transaction().add(\n SystemProgram.transfer({\n fromPubkey,\n toPubkey,\n lamports: 1_000_000, \u002F\u002F 0.001 SOL\n }),\n);\n\ntransaction.recentBlockhash = (await connection.getLatestBlockhash()).blockhash;\ntransaction.feePayer = fromPubkey;\n\nconst serialized = transaction.serialize({\n requireAllSignatures: false,\n verifySignatures: false,\n});\nconst base64Transaction = Buffer.from(serialized).toString('base64');\n```\n\n### Step 5: Sign a transaction (signTransaction)\n\nReturns the signed transaction without broadcasting it.\n\n```typescript\nconst SOLANA_MAINNET = 'solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp';\n\nconst signResult = await client.invokeMethod({\n scope: SOLANA_MAINNET,\n request: {\n method: 'signTransaction',\n params: {\n account: { address: 'YourSolanaAddressBase58' },\n transaction: base64Transaction,\n scope: SOLANA_MAINNET,\n },\n },\n});\n\n\u002F\u002F The result field is `signedTransaction` (base64), not `transaction`\nconsole.log('Signed transaction:', signResult.signedTransaction);\n```\n\nYou can then broadcast the signed transaction yourself:\n\n```typescript\nconst signedBuffer = Buffer.from(signResult.signedTransaction, 'base64');\nconst txId = await connection.sendRawTransaction(signedBuffer);\nconsole.log('Transaction ID:', txId);\n```\n\n### Step 6: Sign and send a transaction (signAndSendTransaction)\n\nSigns and broadcasts the transaction in one step.\n\n```typescript\nconst sendResult = await client.invokeMethod({\n scope: SOLANA_MAINNET,\n request: {\n method: 'signAndSendTransaction',\n params: {\n account: { address: 'YourSolanaAddressBase58' },\n transaction: base64Transaction,\n scope: SOLANA_MAINNET,\n },\n },\n});\n\n\u002F\u002F sendResult: { signature: \u003Cbase58 transaction signature> }\nconsole.log('Transaction signature:', sendResult.signature);\n```\n\n### Step 7: Devnet transactions\n\nConnect with the devnet scope and point `@solana\u002Fweb3.js` at the devnet cluster:\n\n```typescript\nconst SOLANA_DEVNET = 'solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1';\n\nawait client.connect([SOLANA_DEVNET], []);\n\nconst connection = new Connection(clusterApiUrl('devnet'));\n\n\u002F\u002F Build transaction with devnet connection...\nconst base64Tx = buildAndSerializeTransaction(connection);\n\nconst result = await client.invokeMethod({\n scope: SOLANA_DEVNET,\n request: {\n method: 'signAndSendTransaction',\n params: {\n account: { address: 'YourSolanaAddressBase58' },\n transaction: base64Tx,\n scope: SOLANA_DEVNET,\n },\n },\n});\n```\n\n### Step 8: Selective disconnect\n\nDisconnect only Solana scopes while keeping EVM sessions active:\n\n```typescript\n\u002F\u002F Disconnect only Solana mainnet — EVM scopes remain connected\nawait client.disconnect(['solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp']);\n\n\u002F\u002F Disconnect all scopes (full session teardown)\nawait client.disconnect();\n```\n\n### Step 9: Error handling\n\n`invokeMethod` errors are wrapped in `RPCInvokeMethodErr` — its own `code` is always `53`, and the wallet's original EIP-1193 \u002F JSON-RPC code (e.g. `4001` user rejection) is on `rpcCode`:\n\n```typescript\nimport { RPCInvokeMethodErr } from '@metamask\u002Fconnect-multichain';\n\ntry {\n await client.invokeMethod({\n scope: SOLANA_MAINNET,\n request: {\n method: 'signAndSendTransaction',\n params: {\n account: { address: 'YourSolanaAddressBase58' },\n transaction: base64Tx,\n scope: SOLANA_MAINNET,\n },\n },\n });\n} catch (err) {\n if (err instanceof RPCInvokeMethodErr && err.rpcCode === 4001) {\n \u002F\u002F User rejected the transaction in MetaMask — not an app error\n } else {\n console.error('Solana transaction error:', err);\n }\n}\n```\n\n## Important Notes\n\n- **All Solana methods go to the wallet.** There is no RPC node routing for Solana — every `invokeMethod` call with a Solana scope prompts MetaMask.\n- **Base64 encoding required.** Transactions and messages must be base64-encoded strings, not raw buffers or hex.\n- **Use `@solana\u002Fweb3.js` to build transactions.** Construct `Transaction` objects, set `recentBlockhash` and `feePayer`, serialize with `requireAllSignatures: false`, then base64-encode.\n- **CAIP-2 genesis hash IDs.** Mainnet is `solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp`. Devnet is `solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1`. These are not cluster URLs — they are genesis hash identifiers.\n- **Solana networks.** Mainnet, devnet, and testnet scopes are all modeled by the SDK; non-mainnet availability depends on the connected MetaMask build\u002Fversion, so handle connection errors rather than assuming a cluster is present.\n- **Selective disconnect preserves other scopes.** Passing specific Solana scopes to `disconnect()` only revokes those scopes. EVM scopes remain active.\n- **Connected scopes required.** `invokeMethod` fails if the Solana scope was not included in the original `connect()` call.\n- **Method names have no `solana_` prefix.** The MetaMask Multichain API methods are `signMessage`, `signTransaction`, and `signAndSendTransaction`, each taking `account: { address }` in params. 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Supports both ETH and ERC-20 tokens. The away wallet operates autonomously after setup — the home device does not need to be online.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4101,4102,4103],{"name":4051,"slug":4052,"type":15},{"name":4068,"slug":4069,"type":15},{"name":17,"slug":18,"type":15},"2026-07-13T06:12:35.380244",{"slug":4106,"name":4106,"fn":4107,"description":4108,"org":4109,"tags":4110,"stars":367,"repoUrl":4117,"updatedAt":4118},"metamask-connect","integrate MetaMask into dApps","Build dApps that integrate MetaMask via the MetaMask Connect SDK — EVM (@metamask\u002Fconnect-evm), Solana (@metamask\u002Fconnect-solana), and multichain (@metamask\u002Fconnect-multichain), plus the wagmi metaMask() connector. Covers client setup across browser\u002FReact\u002FReact Native, connecting, signing messages, sending transactions, multichain invokeMethod across CAIP-2 scopes, migrating from @metamask\u002Fsdk, and troubleshooting connection\u002Fpolyfill issues.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4111,4112,4113,4114,4116],{"name":23,"slug":24,"type":15},{"name":4051,"slug":4052,"type":15},{"name":20,"slug":21,"type":15},{"name":4115,"slug":4115,"type":15},"wagmi",{"name":17,"slug":18,"type":15},"https:\u002F\u002Fgithub.com\u002FMetaMask\u002Fconnect-monorepo","2026-07-13T06:11:34.445665",{"slug":4120,"name":4120,"fn":4121,"description":4122,"org":4123,"tags":4124,"stars":332,"repoUrl":4131,"updatedAt":4132},"metamask-agent-wallet","manage blockchain wallets and transactions","Use when the user asks anything about blockchain wallets, transactions, signing, token transfers, supported chains, wallet balances, perpetual futures trading, prediction markets, token swaps, cross-chain bridges, market data, token discovery, decoding EVM calldata, DeFi earn\u002Fyield vaults, or authentication via the MetaMask Agentic CLI; also when an HTTP request returns 402 Payment Required (x402) or the agent needs to pay for a paywalled API, endpoint, file, or resource over HTTP. Single entry point for all mm CLI operations.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4125,4126,4129,4130],{"name":13,"slug":14,"type":15},{"name":4127,"slug":4128,"type":15},"DeFi","defi",{"name":4051,"slug":4052,"type":15},{"name":17,"slug":18,"type":15},"https:\u002F\u002Fgithub.com\u002FMetaMask\u002Fagent-skills","2026-08-01T05:45:07.976522",{"slug":4134,"name":4134,"fn":4135,"description":4136,"org":4137,"tags":4138,"stars":25,"repoUrl":26,"updatedAt":4147},"migrate-from-sdk","migrate MetaMask SDK to connect-evm and connect-solana","Migrate from @metamask\u002Fsdk to @metamask\u002Fconnect-evm, @metamask\u002Fconnect-multichain, and @metamask\u002Fconnect-solana with step-by-step package, API, and configuration changes",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4139,4140,4143,4146],{"name":4051,"slug":4052,"type":15},{"name":4141,"slug":4142,"type":15},"Migration","migration",{"name":4144,"slug":4145,"type":15},"SDK","sdk",{"name":17,"slug":18,"type":15},"2026-07-13T06:11:46.427441",{"slug":4149,"name":4149,"fn":4150,"description":4151,"org":4152,"tags":4153,"stars":25,"repoUrl":26,"updatedAt":4158},"migrate-wagmi-metamask-connector","migrate wagmi apps to MetaMask connector","Migrate a wagmi app from @metamask\u002Fsdk to the new @metamask\u002Fconnect-evm connector (wagmi PR",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4154,4155,4156,4157],{"name":4051,"slug":4052,"type":15},{"name":4141,"slug":4142,"type":15},{"name":4115,"slug":4115,"type":15},{"name":17,"slug":18,"type":15},"2026-07-13T06:12:23.110706",{"slug":4160,"name":4160,"fn":4161,"description":4162,"org":4163,"tags":4164,"stars":25,"repoUrl":26,"updatedAt":4168},"send-evm-transaction","send EVM transactions with MetaMask","Send ETH and contract transactions with MetaMask using eth_sendTransaction via the EIP-1193 provider, gas estimation, receipt polling, and the connectWith shortcut",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4165,4166,4167],{"name":23,"slug":24,"type":15},{"name":4051,"slug":4052,"type":15},{"name":17,"slug":18,"type":15},"2026-07-13T06:11:56.866623",{"slug":4170,"name":4170,"fn":4171,"description":4172,"org":4173,"tags":4174,"stars":25,"repoUrl":26,"updatedAt":4178},"send-solana-transaction","send Solana transactions via MetaMask","Build and send a Solana transaction using MetaMask Connect. Covers both the React wallet-adapter approach (sendTransaction) and the vanilla browser approach (signAndSendTransaction wallet-standard feature).",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4175,4176,4177],{"name":4068,"slug":4069,"type":15},{"name":20,"slug":21,"type":15},{"name":17,"slug":18,"type":15},"2026-07-13T06:12:03.942378",{"slug":4180,"name":4180,"fn":4181,"description":4182,"org":4183,"tags":4184,"stars":25,"repoUrl":26,"updatedAt":4195},"setup-evm-browser-app","scaffold EVM browser applications with MetaMask","Scaffold a vanilla JS\u002FTS browser app with MetaMask EVM integration using createEVMClient, EIP-1193 provider event listeners, RPC methods, and chain switching with chainConfiguration fallback",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4185,4186,4189,4192,4194],{"name":4051,"slug":4052,"type":15},{"name":4187,"slug":4188,"type":15},"Frontend","frontend",{"name":4190,"slug":4191,"type":15},"JavaScript","javascript",{"name":4193,"slug":127,"type":15},"TypeScript",{"name":17,"slug":18,"type":15},"2026-07-13T06:12:01.334051",{"items":4197,"total":632},[4198,4205,4212,4218,4224,4232,4246],{"slug":4134,"name":4134,"fn":4135,"description":4136,"org":4199,"tags":4200,"stars":25,"repoUrl":26,"updatedAt":4147},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4201,4202,4203,4204],{"name":4051,"slug":4052,"type":15},{"name":4141,"slug":4142,"type":15},{"name":4144,"slug":4145,"type":15},{"name":17,"slug":18,"type":15},{"slug":4149,"name":4149,"fn":4150,"description":4151,"org":4206,"tags":4207,"stars":25,"repoUrl":26,"updatedAt":4158},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4208,4209,4210,4211],{"name":4051,"slug":4052,"type":15},{"name":4141,"slug":4142,"type":15},{"name":4115,"slug":4115,"type":15},{"name":17,"slug":18,"type":15},{"slug":4160,"name":4160,"fn":4161,"description":4162,"org":4213,"tags":4214,"stars":25,"repoUrl":26,"updatedAt":4168},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4215,4216,4217],{"name":23,"slug":24,"type":15},{"name":4051,"slug":4052,"type":15},{"name":17,"slug":18,"type":15},{"slug":4170,"name":4170,"fn":4171,"description":4172,"org":4219,"tags":4220,"stars":25,"repoUrl":26,"updatedAt":4178},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4221,4222,4223],{"name":4068,"slug":4069,"type":15},{"name":20,"slug":21,"type":15},{"name":17,"slug":18,"type":15},{"slug":4180,"name":4180,"fn":4181,"description":4182,"org":4225,"tags":4226,"stars":25,"repoUrl":26,"updatedAt":4195},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4227,4228,4229,4230,4231],{"name":4051,"slug":4052,"type":15},{"name":4187,"slug":4188,"type":15},{"name":4190,"slug":4191,"type":15},{"name":4193,"slug":127,"type":15},{"name":17,"slug":18,"type":15},{"slug":4233,"name":4233,"fn":4234,"description":4235,"org":4236,"tags":4237,"stars":25,"repoUrl":26,"updatedAt":4245},"setup-evm-react-app","scaffold React apps with MetaMask integration","Scaffold a React app with MetaMask EVM integration using createEVMClient, useState\u002FuseEffect\u002FuseRef patterns, provider.request calls, chain switching, and error handling",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4238,4239,4240,4241,4244],{"name":23,"slug":24,"type":15},{"name":4051,"slug":4052,"type":15},{"name":4187,"slug":4188,"type":15},{"name":4242,"slug":4243,"type":15},"React","react",{"name":17,"slug":18,"type":15},"2026-07-13T06:11:52.764143",{"slug":4247,"name":4247,"fn":4248,"description":4249,"org":4250,"tags":4251,"stars":25,"repoUrl":26,"updatedAt":4260},"setup-evm-react-native-app","scaffold React Native apps with MetaMask","Scaffold a React Native app with MetaMask EVM integration including required polyfills, metro.config.js shims, import order constraints, mobile deeplinks, and a full component example",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[4252,4253,4256,4259],{"name":4051,"slug":4052,"type":15},{"name":4254,"slug":4255,"type":15},"Mobile","mobile",{"name":4257,"slug":4258,"type":15},"React Native","react-native",{"name":17,"slug":18,"type":15},"2026-07-13T06:12:11.764689"]