Pump.fun Bundler API Guide 2026

APIs Used for Pump.fun Bundling in 2026

Pump.fun bundling in 2026 relies on three main APIs: the Pump.fun program API for token creation, pumpportal.fun for simplified trade transaction generation, and the Jito block engine API for bundle submission.

Pumpportal.fun API

Pumpportal.fun provides a simplified REST API that generates pre-built Pump.fun transactions. You send parameters (wallet, action, mint, amount) and receive a serialized transaction ready to sign. SolBundler uses this API internally for reliable transaction generation.

Jito Block Engine API

The Jito bundle API accepts an array of up to 5 base58-encoded signed transactions. The endpoint is https://mainnet.block-engine.jito.wtf/api/v1/bundles. You submit via JSON-RPC with the sendBundle method. Multiple regional endpoints (NY, Amsterdam, Frankfurt, Tokyo) improve success rates.

Solana RPC Requirements

Reliable bundling requires a premium Solana RPC provider. In 2026, Helius and QuickNode offer the lowest latency and highest reliability for Pump.fun bundle operations. Free public RPC endpoints are too slow for competitive block 0 execution.

SolBundler's API Implementation

SolBundler handles all API complexity internally. It manages RPC connections, constructs bundles, rotates Jito endpoints, and handles errors automatically. You get the benefits of direct API access without writing a single line of code.