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web3.js and Kit

Client connections, reads, writes and live subscriptions.

TestnetVerified Oct 15, 2026
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web3.js#

Connect to Kyvro with a standard Connection, then check the genesis hash before trusting anything it tells you.

connection.ts
import { Connection, PublicKey } from "@solana/web3.js";

export const connection = new Connection("https://rpc-testnet.kyvro.si", "confirmed");

const genesis = await connection.getGenesisHash();
if (genesis !== "A8qzbNkAdT1GsqmyKTifWnTgS7PuqqmniwdsGeaPc5Jo") throw new Error("Not Kyvro Testnet");

const balance = await connection.getBalance(new PublicKey("<address>"));
console.log("lamports:", balance);

Writes follow the usual pattern: fetch a fresh blockhash, sign locally, send. Transactions expire with their blockhash — on expiry, rebuild with a new one rather than resending.

transfer.ts
import { SystemProgram, Transaction } from "@solana/web3.js";
import { connection } from "./connection";

const { blockhash, lastValidBlockHeight } = await connection.getLatestBlockhash("confirmed");
const tx = new Transaction({ blockhash, lastValidBlockHeight, feePayer: payer.publicKey })
  .add(SystemProgram.transfer({ fromPubkey: payer.publicKey, toPubkey, lamports: 1_000_000 }));
tx.sign(payer);
const signature = await connection.sendRawTransaction(tx.serialize());

Kit#

The newer @solana/kit client works the same way: point it at the Kyvro RPC and call standard methods.

kit.ts
import { address, createSolanaRpc } from "@solana/kit";

const rpc = createSolanaRpc("https://rpc-testnet.kyvro.si");

const genesis = await rpc.getGenesisHash().send();
if (genesis !== "A8qzbNkAdT1GsqmyKTifWnTgS7PuqqmniwdsGeaPc5Jo") throw new Error("Not Kyvro Testnet");

const slot = await rpc.getSlot().send();
const { value: balance } = await rpc.getBalance(address("<address>")).send();

Live subscriptions#

The WebSocket endpoint at wss://rpc-testnet.kyvro.si speaks standard Solana subscriptions: slot updates, logs and signature confirmations.

web3.js
import { Connection } from "@solana/web3.js";

const ws = new Connection("https://rpc-testnet.kyvro.si", { commitment: "confirmed", wsEndpoint: "wss://rpc-testnet.kyvro.si" });
const id = ws.onSlotUpdate((update) => console.log("slot", update.slot));

Simulating transactions#

There are no debug_* or trace_* methods. Preview what a transaction will do with simulateTransaction, and read execution logs on the explorer(opens in a new tab) after it lands. See JSON-RPC for the full method list.

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