Mesh SDK Wallet Skill

AI-assisted Cardano wallet integration using @meshsdk/wallet.

Package Info

npm install @meshsdk/wallet
# or
npm install @meshsdk/core  # includes wallet + transaction + provider

Two Wallet Types

Type	Class	Use Case
Browser	MeshCardanoBrowserWallet	Web apps - connect to Eternl, Nami, Flint, etc.
Headless	MeshCardanoHeadlessWallet	Server-side, CLI, backend - from mnemonic/keys

Quick Reference

Browser Wallet (CIP-30)

import { MeshCardanoBrowserWallet } from '@meshsdk/wallet';

// List installed wallets
const wallets = MeshCardanoBrowserWallet.getInstalledWallets();
// → [{ id: 'eternl', name: 'Eternl', icon: '...', version: '...' }, ...]

// Connect to wallet
const wallet = await MeshCardanoBrowserWallet.enable('eternl');

// Get addresses (Bech32)
const addresses = await wallet.getUsedAddressesBech32();
const changeAddr = await wallet.getChangeAddressBech32();
const stakeAddrs = await wallet.getRewardAddressesBech32();

// Get UTxOs and balance (Mesh format)
const utxos = await wallet.getUtxosMesh();
const balance = await wallet.getBalanceMesh();
const collateral = await wallet.getCollateralMesh();

// Sign and submit
const signedTx = await wallet.signTxReturnFullTx(unsignedTxHex);
const txHash = await wallet.submitTx(signedTx);

// Sign data (CIP-8)
const signature = await wallet.signData(address, 'Hello Cardano!');

Headless Wallet (Server-Side)

import { MeshCardanoHeadlessWallet } from '@meshsdk/wallet';
import { BlockfrostProvider } from '@meshsdk/core';

const provider = new BlockfrostProvider('your-api-key');

// From mnemonic
const wallet = await MeshCardanoHeadlessWallet.fromMnemonic({
  mnemonic: ['word1', 'word2', ...],  // 24 words
  networkId: 0,  // 0 = testnet, 1 = mainnet
  walletAddressType: 'Base',  // 'Base' or 'Enterprise'
  fetcher: provider,
  submitter: provider,
});

// Same API as browser wallet
const address = await wallet.getChangeAddressBech32();
const utxos = await wallet.getUtxosMesh();
const signedTx = await wallet.signTxReturnFullTx(unsignedTxHex);

Files

• WALLET.md - Complete API reference
• PATTERNS.md - Common wallet patterns
• TROUBLESHOOTING.md - Error solutions

CIP-30 Methods

Standard wallet interface methods:

Method	Returns	Description
getNetworkId()	number	0 = testnet, 1 = mainnet
getUtxos()	string[]	UTxOs in CBOR hex
getCollateral()	string[]	Collateral UTxOs in CBOR hex
getBalance()	string	Balance in CBOR hex
getUsedAddresses()	string[]	Addresses in hex
getUnusedAddresses()	string[]	Addresses in hex
getChangeAddress()	string	Address in hex
getRewardAddresses()	string[]	Stake addresses in hex
signTx(tx, partial)	string	Witness set in CBOR hex
signData(addr, data)	DataSignature	CIP-8 signature
submitTx(tx)	string	Transaction hash

Mesh Extensions

Enhanced methods for better developer experience:

Method	Returns	Description
getUtxosMesh()	UTxO[]	UTxOs in Mesh format
getCollateralMesh()	UTxO[]	Collateral in Mesh format
getBalanceMesh()	Asset[]	Balance in Mesh format
getUsedAddressesBech32()	string[]	Bech32 addresses
getUnusedAddressesBech32()	string[]	Bech32 addresses
getChangeAddressBech32()	string	Bech32 address
getRewardAddressesBech32()	string[]	Bech32 stake addresses
signTxReturnFullTx(tx, partial)	string	Full signed tx (not just witness)

Important Notes

1. Browser wallet requires user interaction - enable() prompts the user
2. Headless wallet needs fetcher - For UTxO queries and signing
3. Network ID matters - 0 for testnet/preprod, 1 for mainnet
4. Collateral is auto-selected - Returns smallest pure-ADA UTxO >= 5 ADA