Heard about Hedera’s bridgeless CLPR and want to start building? Here’s the honest situation: as of 2026, there’s no public CLPR SDK — it’s in closed beta for institutions. But that’s not a reason to wait. Everything CLPR is built on top of — Hedera’s SDKs, its free testnet, and its token and messaging services — is open, documented, and free to use right now.
So this is the practical starting point. You’ll learn how to build on Hedera today, get a first transaction working in minutes, and pick up exactly the skills you’ll need when CLPR opens up. No fluff, no fabricated APIs — just the real on-ramp.
🧰 The Toolkit: Hiero SDKs
First, a naming thing that trips up newcomers. Hedera donated its network software and SDKs to the Linux Foundation, where they now live as the Hiero project. That means the packages migrated from the old hashgraph namespace to hiero-ledger.
The maintained official SDKs cover Java, JavaScript/TypeScript, Go, and Swift (with C++ and Rust also available), and they share the same API surface — so code translates almost line-for-line between them. The one gotcha: new JavaScript work should use the @hiero-ledger packages (from SDK version 2.83.0 onward), not the legacy @hashgraph/sdk. Older tutorials referencing @hashgraph still function, but you’ll want the current namespace — always confirm the exact package name and version on the official Hiero GitHub before you copy an install command.
🆓 Step 1: Get a Free Testnet Account
You do not need to buy any real HBAR to start. Hedera runs a free testnet with a generous faucet.
- Sign up at the Hedera Portal and create a testnet account.
- Your account is auto-funded with 10,000 test HBAR every 24 hours — plenty to experiment freely.
- Note your account ID and private key; you’ll point the SDK at these.
There are three environments to know: Mainnet (production, real value), Testnet (development — start here), and Previewnet (bleeding-edge features). For learning, testnet is home.
⚡ Step 2: Your First Transaction
With an account in hand, the flow is refreshingly short:
- Install an SDK — for example the JavaScript/TypeScript SDK from the
@hiero-ledgernamespace (Java, Go, or Swift are equally good). - Instantiate a client pointed at
testnet, and set your operator account ID and private key. - Submit a transaction — create a new account, transfer some test HBAR, or (see below) create a token.
Conceptually, a first HBAR transfer in the JS SDK looks like this — treat it as the shape of the code and verify current package/method names against the docs:
import { Client, TransferTransaction, Hbar } from "@hiero-ledger/sdk"; const client = Client.forTestnet();client.setOperator(myAccountId, myPrivateKey); await new TransferTransaction() .addHbarTransfer(myAccountId, new Hbar(-1)) .addHbarTransfer(recipientId, new Hbar(1)) .execute(client);Because Hedera reaches consensus in seconds, your transaction confirms almost immediately — and you can look it up on the HashScan explorer to see its consensus timestamp and fee.
🪙 Step 3: Create a Token With HTS
Here’s where you start touching the primitives CLPR actually uses. The Hedera Token Service (HTS) lets you issue your own fungible token or NFT natively — no smart contract required — and it’s the issuer-controlled token model that a cross-ledger transfer’s burn-and-mint flow depends on. Creating a test token, setting its supply and keys, and practicing issuer authorization is the single most relevant thing a future CLPR builder can learn today.
Pair that with the Hedera Consensus Service (HCS) — a tamper-proof, ordered messaging log — and you’ve touched the two services (token issuance and consensus messaging) that sit directly beneath the cross-ledger machinery.
🔷 The EVM Path (Worth Knowing for CLPR’s Roadmap)
CLPR’s roadmap targets EVM chains — Ethereum, Hyperledger Besu, Avalanche subnets — so the EVM side of Hedera is worth practicing too. Hedera offers full EVM compatibility: write Solidity with Hardhat, Foundry, or Remix, and connect MetaMask, Ethers.js, or Viem through Hedera’s JSON-RPC Relay. If your eventual goal is moving assets between Hedera and an EVM chain, you can rehearse the EVM leg with completely familiar tools now.
🌉 What About Building on CLPR Itself?
Straight answer: you can’t yet, and don’t let anyone sell you otherwise. There is no public CLPR SDK, API reference, or code sample as of 2026 — the CLPR page links developers only to the general Hedera and HashSphere docs. Access is through an invite-only Early Adopter Program aimed at institutions, and the first real integrations will likely go through HashSphere, the managed private-network product.
But the skills map cleanly. The best way to prepare is simply to build on Hedera now: when CLPR opens, a cross-ledger transfer will lean on exactly what you can practice today — HTS token issuance and issuer authorization, HCS messaging, and Hedera’s state proofs and mirror-node queries. Learn those now on free testnet, and you’ll be ready to add the CLPR “glue” the moment it’s public — instead of starting from zero.
❓ Frequently Asked Questions
Is there a CLPR SDK I can install today? No. CLPR is in closed beta for institutions as of 2026 — no public SDK, API, or code samples exist. Build on the underlying Hedera stack to prepare.
Do I need real HBAR to start building on Hedera? No. The testnet is free and auto-funds your account with 10,000 test HBAR every 24 hours.
Which language should I use? Any of the Hiero SDKs — Java, JavaScript/TypeScript, Go, or Swift. They share an API surface, so pick what you know. Just use the current @hiero-ledger packages for new work.
Can I use Solidity and MetaMask with Hedera? Yes. Hedera is EVM-compatible via its JSON-RPC Relay, so Hardhat, Foundry, Remix, MetaMask, Ethers.js, and Viem all work.
What should I learn now to be ready for CLPR? HTS token issuance and issuer authorization, HCS messaging, and working with Hedera state proofs — these are the building blocks a cross-ledger transfer uses.
📚 Further Reading
- What Is Hedera’s CLPR? — the protocol you’re preparing to build on.
- How Fast & Cheap Is Hedera CLPR Performance? — measure your transactions with Mirror Node and HashScan.
- Decentralized Computing with Hedera Hashgraph — the network fundamentals behind the code.
Part of LearnInternetGrow’s series on Hedera Hashgraph and the Cross-Ledger Protocol.