MultiversX SDK-JS Core Operations Skill

MultiversX SDK-JS Core Operations

This skill covers the fundamental building blocks of the @multiversx/sdk-core v15 library.

Entrypoints

Network-specific clients that simplify common operations:

| Entrypoint | Network | Default URL | |------------|---------|-------------| | DevnetEntrypoint | Devnet | https://devnet-api.multiversx.com | | TestnetEntrypoint | Testnet | https://testnet-api.multiversx.com | | MainnetEntrypoint | Mainnet | https://api.multiversx.com | | LocalnetEntrypoint | Local | http://localhost:7950 |

import { DevnetEntrypoint } from "@multiversx/sdk-core";

// Default API
const entrypoint = new DevnetEntrypoint();

// Custom API
const entrypoint = new DevnetEntrypoint({ url: "https://custom-api.com" });

// Proxy mode (gateway)
const entrypoint = new DevnetEntrypoint({ 
    url: "https://devnet-gateway.multiversx.com", 
    kind: "proxy" 
});

Entrypoint Methods

| Method | Description | |--------|-------------| | createAccount() | Create a new account instance | | createNetworkProvider() | Get underlying network provider | | recallAccountNonce(address) | Fetch current nonce from network | | sendTransaction(tx) | Broadcast single transaction | | sendTransactions(txs) | Broadcast multiple transactions | | getTransaction(txHash) | Fetch transaction by hash | | awaitCompletedTransaction(txHash) | Wait for finality |

Network Providers

Lower-level network access:

| Provider | Use Case | |----------|----------| | ApiNetworkProvider | Standard API queries (recommended) | | ProxyNetworkProvider | Direct node interaction via gateway |

const provider = entrypoint.createNetworkProvider();

// Or manual instantiation
import { ApiNetworkProvider } from "@multiversx/sdk-core";

const api = new ApiNetworkProvider("https://devnet-api.multiversx.com", {
    clientName: "my-app",
    requestsOptions: { timeout: 10000 }
});

Provider Methods

| Method | Description | |--------|-------------| | getNetworkConfig() | Chain ID, gas settings, etc. | | getNetworkStatus() | Current epoch, nonce, etc. | | getBlock(blockHash) | Fetch block data | | getAccount(address) | Account balance, nonce | | getAccountStorage(address) | Contract storage | | getTransaction(txHash) | Transaction details | | awaitTransactionCompletion(txHash) | Wait for finality | | queryContract(query) | VM query (read-only) |

Transaction Lifecycle

// 1. Create account and sync nonce
const account = await Account.newFromPem("wallet.pem");
account.nonce = await entrypoint.recallAccountNonce(account.address);

// 2. Create transaction (via controller)
const controller = entrypoint.createTransfersController();
const tx = await controller.createTransactionForTransfer(
    account, 
    account.getNonceThenIncrement(),
    { receiver, nativeAmount: 1000000000000000000n }
);

// 3. Send
const txHash = await entrypoint.sendTransaction(tx);

// 4. Wait for completion
const result = await entrypoint.awaitCompletedTransaction(txHash);
console.log("Status:", result.status);

Best Practices

Always sync nonce before creating transactions
Use awaitCompletedTransaction for critical operations
Handle errors - network calls can fail
Use appropriate timeouts for long operations
Batch transactions when possible with sendTransactions()

Agent Skills: MultiversX SDK-JS Core Operations

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