Pump.fun Bundler Scripts: Complete Guide 2026

What Are Pump.fun Bundler Scripts?

Pump.fun bundler scripts are programs that automate the process of creating a token and executing simultaneous buy transactions in a single Jito bundle. In 2026, these scripts are written in TypeScript or Python using the Solana web3.js library and Jito SDK.

Core Components of a Bundler Script

A typical Pump.fun bundler script in 2026 includes: wallet management (keypair generation and signing), token creation transaction (calling Pump.fun program), bundle wallet buy transactions (using pumpportal.fun API or direct program calls), Jito bundle construction and submission, and error handling with retry logic.

Why Building Your Own Script is Hard

Writing a reliable bundler script requires deep knowledge of: Solana transaction structure, Jito bundle API, versioned transactions, blockhash management, priority fee optimization, and error recovery. Most developers spend weeks debugging before getting reliable execution.

Common Script Errors in 2026

Transaction expired (blockhash too old), bundle rejected by Jito (tip too low), wallet balance insufficient, slippage exceeded on buy transactions, and RPC rate limiting are the most common issues developers face with custom scripts.

SolBundler: Scripts Without the Complexity

SolBundler provides all the functionality of a custom bundler script through a simple web interface. It handles blockhash management, Jito tip optimization, multi-endpoint submission, and error recovery automatically — so you can focus on launches, not debugging.