Quick Reference

Check Balance

import { createHelius } from 'helius-sdk';

const helius = createHelius({ apiKey: 'YOUR_KEY' });
const assets = await helius.getAssetsByOwner({
  ownerAddress: 'WALLET_ADDRESS',
  displayOptions: {
    showFungible: true,
    showNativeBalance: true
  }
});

Send SOL

import { Connection, Keypair, SystemProgram, Transaction, sendAndConfirmTransaction, LAMPORTS_PER_SOL } from '@solana/web3.js';

const connection = new Connection('https://mainnet.helius-rpc.com/?api-key=YOUR_KEY');
const tx = new Transaction().add(
  SystemProgram.transfer({
    fromPubkey: sender.publicKey,
    toPubkey: recipientPubkey,
    lamports: amount * LAMPORTS_PER_SOL
  })
);
await sendAndConfirmTransaction(connection, tx, [sender]);

Jupiter Swap

// 1. Get quote
const quote = await fetch(`https://api.jup.ag/swap/v1/quote?inputMint=${inputMint}&outputMint=${outputMint}&amount=${amount}`);

// 2. Build swap transaction
const swap = await fetch('https://api.jup.ag/swap/v1/swap', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    quoteResponse: await quote.json(),
    userPublicKey: wallet.publicKey.toString()
  })
});

// 3. Sign and send

API Endpoints

Service	Base URL
Helius RPC	`https://mainnet.helius-rpc.com/?api-key=KEY`
Helius Sender	`https://sender.helius-rpc.com/fast`
Jupiter Quote	`https://api.jup.ag/swap/v1/quote`
Jupiter Swap	`https://api.jup.ag/swap/v1/swap`

Security

Critical rules:

Never log or display private keys
Use encrypted storage for keys
Validate all addresses before transactions
Set reasonable slippage limits (default: 1%)
Always confirm large transactions with user

See references/security.md for detailed security practices.

Detailed References

references/helius-api.md — Full Helius API reference
references/security.md — Wallet security best practices
references/jupiter.md — Jupiter swap integration

Common Token Addresses

Token	Mint Address
SOL	`So11111111111111111111111111111111111111112` (wrapped)
USDC	`EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v`
USDT	`Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB`
BONK	`DezXAZ8z7PnrnRJjz3wXBoRgixCa6xjnB7YaB1pPB263`

Error Handling

Common errors and solutions:

Insufficient SOL: Need SOL for rent + transaction fees
Token account not found: Create ATA before sending tokens
Transaction too large: Reduce instructions or use address lookup tables
Blockhash expired: Retry with fresh blockhash

solana-skill

Solana Skill

Prerequisites

Core Capabilities