Address Lookup Table Guide

This guide explains how to use Address Lookup Tables (ALT) in Sol Trade SDK to optimize transaction size and reduce fees.

📋 What are Address Lookup Tables?

Address Lookup Tables are a Solana feature that allows you to store frequently used addresses in a compact table format. Instead of including full 32-byte addresses in transactions, you can reference addresses by their index in the lookup table, significantly reducing transaction size and cost.

🚀 Core Benefits

Transaction Size Optimization: Reduce transaction size by using address indices instead of full addresses
Cost Reduction: Lower transaction fees due to reduced transaction size
Performance Improvement: Faster transaction processing and validation
Network Efficiency: Reduced bandwidth usage and block space consumption

🛠️ Implementation

Include lookup tables in your trade parameters:

let lookup_table_key = Pubkey::from_str("use_your_lookup_table_key_here").unwrap();
let alt = fetch_address_lookup_table_account(&client.rpc, &lookup_table_key).await?;

// Include lookup table in trade parameters
let buy_params = sol_trade_sdk::TradeBuyParams {
    dex_type: DexType::PumpFun,
    mint: mint_pubkey,
    sol_amount: buy_sol_amount,
    slippage_basis_points: Some(100),
    recent_blockhash: Some(recent_blockhash),
    extension_params: Box::new(PumpFunParams::from_trade(&trade_info, None)),
    address_lookup_table_accounts: vec![alt], // One ALT
    wait_transaction_confirmed: true,
    create_wsol_ata: false,
    close_wsol_ata: false,
    create_mint_ata: true,
    open_seed_optimize: false,
};

// Execute transaction
client.buy(buy_params).await?;

Multiple lookup tables are also supported:

let alt1 = fetch_address_lookup_table_account(&client.rpc, &lookup_table_key_1).await?;
let alt2 = fetch_address_lookup_table_account(&client.rpc, &lookup_table_key_2).await?;

let params = SimpleBuyParams::new(
    DexType::PumpFun,
    TradeTokenType::SOL,
    mint_pubkey,
    BuyAmount::ExactInput(buy_lamports),
    extension_params,
    recent_blockhash,
    gas_fee_strategy,
)
.address_lookup_table_accounts(vec![alt1, alt2]);

Use the same address_lookup_table_accounts field for one or many ALTs: vec![alt] for a single ALT, vec![alt1, alt2] for multiple ALTs.

📊 Performance Comparison

Aspect	Without ALT	With ALT	Improvement
Transaction Size	~1,232 bytes	~800 bytes	35% reduction
Address Storage	32 bytes per address	1 byte per address	97% reduction
Transaction Fees	Higher	Lower	Up to 30% savings
Block Space Usage	More	Less	Improved network efficiency

⚠️ Important Notes

Lookup Table Address: Must provide a valid address lookup table address
RPC Compatibility: Ensure your RPC provider supports lookup tables
Network Specific: Lookup tables are network-specific (mainnet/devnet/testnet)
Testing: Always test on devnet before using on mainnet

📚 External Resources

Solana Address Lookup Tables Documentation

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