What are the pros of sol4k?

Native Solana access for JVM and Android stacks. Avoids bridging to a JavaScript SDK. Supports both versioned and legacy transactions. Includes ready-made instructions plus a custom-program base class.

What are the cons of sol4k?

Community library, not an official Solana SDK. Smaller feature surface than web3.js may lag new program features. Niche to JVM/Android developers.

How much does sol4k cost?

sol4k is completely free to use.

sol4k Review | Honest Verdict (2026)

sol4k is a Kotlin client for Solana that lets JVM and Android developers talk to the chain without leaving their language ecosystem. It works with Kotlin, Java and other JVM languages, and runs on Android and JavaScript, filling a gap for teams not on JavaScript or Rust. The library connects via RPC nodes and exposes APIs to query state, create and read accounts, check balances, simulate transactions, fetch a blockhash and submit transactions. It handles key pairs and public keys, supports versioned and legacy transaction formats, and can build, sign, serialize and deserialize transactions with single or multiple instructions. Pre-built instruction classes cover SOL transfers and token account creation, plus a base class for custom programs and SPL tokens. For Android and backend Java/Kotlin teams, this avoids bridging to JavaScript. It is aimed at JVM and Android developers integrating Solana into apps and wallets. Caveat: as a community client it tracks a smaller surface than official web3.js, so new program features may lag.

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Uptime, SSL, response time.

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