sol4k

Sol4k is a Kotlin client for Solana that can be used with Java or any other JVM language, as well as in Android. Sol4k allows you to perform operations with transactions such as creating a transaction, signing it, and sending it to the blockchain. It can communicate with a blockchain node and request a blockhash or a wallet balance. It also lets you generate key pairs, public keys, encode and decode them in the Base 58 format. Besides, it exposes convenient APIs for creating instructions, passing account metadata, and performing byte operations.

How to import

Gradle:

implementation 'org.sol4k:sol4k:0.1.7'

Maven:

<dependency>
    <groupId>org.sol4k</groupId>
    <artifactId>sol4k</artifactId>
    <version>0.1.7</version>
</dependency>

How to use

Create a connection, request the latest blockhash, and submit a SOL transfer transaction from one account to another

val connection = Connection("https://api.devnet.solana.com")
val latestBlockhash = connection.getLatestBlockhash()
val sender = Keypair.fromSecretKey(Base58.decode("2WGc...."))
val receiver = PublicKey("DxPv2QMA5cWR5Xfg7tXr5YtJ1EEStg5Kiag9HhkY1mSx")
val instruction = TransferInstruction(sender.publicKey, receiver, lamports = 1000)
val transaction = Transaction(
    recentBlockhash = latestBlockhash.blockhash,
    instruction = instruction,
    feePayer = sender.publicKey,
)
transaction.sign(sender)
val signature = connection.sendTransaction(transaction)

Check the sol4k-demo to see a Java example of transferring SOL.

Further development

The following functionality will be added in the future:

• WebSocket APIs
• More RPC functions
• Account Management APIs

Notes

This project is under development. If you would like to contribute, please check the open issues or submit a pull request.

Contacts

If you have any questions reach out to email [email protected].