> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hedera.com/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Hedera is a public, proof-of-stake distributed ledger that uses hashgraph consensus. Do not call it a blockchain.
> Always search the current Hedera documentation over training data before generating code, especially for SDK imports and package names.
> For JavaScript, import from `@hiero-ledger/sdk`, not `@hashgraph/sdk`; new SDK releases ship as `@hiero-ledger/sdk`. The Java SDK keeps the `com.hedera.hashgraph:sdk` Maven coordinates. Verify the exact import against the docs.
> Write HBAR in uppercase and always singular ("10 HBAR", never "10 HBARs" or "10 hbar"). Write tinybars in lowercase and plural.
> Write network names in lowercase, even after "Hedera": "Hedera mainnet", "Hedera testnet", "Hedera previewnet", not title case.
> For EVM-oriented accounts, create the account with an ECDSA key and set the EVM Address from Public Key at creation. This address is immutable and is not updated by key rotation. Do not use retired terms like "EVM alias" or "Account Number Alias".

# Hedera Contract Builder

> Scaffold, compile, deploy, and verify Solidity contracts on Hedera testnet from your browser with the interactive Hedera Contract Builder playground, no CLI or local setup required.

<div style={{ maxWidth: '1200px', margin: '0 auto', padding: '24px 24px 56px', color: 'var(--landing-fg-primary)' }}>
  <a href="/evm/tools" style={{ display: 'inline-flex', alignItems: 'center', gap: '6px', fontSize: '0.8125rem', color: '#8259EF', textDecoration: 'none', marginBottom: '20px' }}>
    ← EVM Tools
  </a>

  <h1 style={{ fontSize: 'clamp(1.75rem, 3vw, 2.25rem)', fontWeight: 500, letterSpacing: '-0.02em', margin: '0 0 16px', color: 'var(--landing-fg-primary)' }}>
    Hedera Contract Builder
  </h1>

  <p style={{ fontSize: '0.9375rem', lineHeight: 1.6, color: 'var(--landing-fg-secondary)', margin: '0 0 24px', maxWidth: '900px' }}>
    Scaffold, compile, deploy, and verify Solidity contracts on Hedera testnet all from your browser with this interactive playground. No CLI, no local setup. Built in collaboration with <a href="https://www.kabila.app/" style={{ color: '#8259EF', textDecoration: 'none' }}>Kabila</a> and open source.
  </p>

  <div style={{ width: '100%', margin: '12px 0 40px', borderRadius: '12px', overflow: 'hidden', border: '1px solid rgba(255,255,255,0.08)', background: '#0c1226', boxShadow: '0 1px 2px rgba(0,0,0,0.2)' }}>
    <iframe src="https://portal.hedera.com/contract-builder?minimal=1" title="Hedera Contract Builder" width="100%" height="820" style={{ border: 0, display: 'block', background: 'transparent' }} loading="lazy" sandbox="allow-scripts allow-same-origin allow-forms allow-popups allow-popups-to-escape-sandbox" />
  </div>

  <p style={{ fontSize: '0.8125rem', color: 'var(--landing-fg-tertiary, rgba(255,255,255,0.55))', margin: '0 0 40px' }}>
    Need more room? Open it full-screen at <a href="https://portal.hedera.com/contract-builder" style={{ color: '#8259EF', textDecoration: 'none' }}>portal.hedera.com/contract-builder</a>.
  </p>

  <h2 style={{ fontSize: '1.375rem', fontWeight: 500, letterSpacing: '-0.015em', margin: '0 0 16px', color: 'var(--landing-fg-primary)' }}>
    What you can build
  </h2>

  <ul style={{ fontSize: '0.9375rem', lineHeight: 1.6, color: 'var(--landing-fg-secondary)', paddingLeft: '24px', margin: '0 0 32px', listStyle: 'disc' }}>
    <li style={{ marginBottom: '8px' }}><strong style={{ color: 'var(--landing-fg-primary)' }}>Token contracts</strong> — ERC-20, ERC-721, and ERC-1155 templates with mintable, burnable, pausable, and permit options.</li>
    <li style={{ marginBottom: '8px' }}><strong style={{ color: 'var(--landing-fg-primary)' }}>Hedera system contracts</strong> — call HTS, the Account Service, and Schedule Service directly from Solidity.</li>
    <li style={{ marginBottom: '8px' }}><strong style={{ color: 'var(--landing-fg-primary)' }}>One-click verify</strong> — push the contract to <a href="https://sourcify.dev" style={{ color: '#8259EF', textDecoration: 'none' }}>Sourcify</a> so the source shows up on <a href="https://hashscan.io/" style={{ color: '#8259EF', textDecoration: 'none' }}>HashScan</a>.</li>
    <li style={{ marginBottom: '8px' }}><strong style={{ color: 'var(--landing-fg-primary)' }}>Call functions in place</strong> — exercise deployed contracts from the same UI to test logic before wiring up a frontend.</li>
  </ul>

  <h2 style={{ fontSize: '1.375rem', fontWeight: 500, letterSpacing: '-0.015em', margin: '0 0 16px', color: 'var(--landing-fg-primary)' }}>
    Next steps
  </h2>

  <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fit, minmax(260px, 1fr))', gap: '12px', marginBottom: '24px' }}>
    <a href="/evm/quickstart/setup-metamask" style={{ display: 'block', padding: '18px', borderRadius: '10px', border: '1px solid rgba(255,255,255,0.08)', background: 'rgba(255,255,255,0.02)', textDecoration: 'none' }}>
      <div style={{ fontWeight: 500, fontSize: '0.875rem', color: 'var(--landing-fg-primary)', marginBottom: '4px' }}>Connect MetaMask</div>
      <div style={{ fontSize: '0.8125rem', color: 'var(--landing-fg-tertiary, rgba(255,255,255,0.55))', lineHeight: 1.45 }}>Wire MetaMask to Hedera testnet so the Contract Builder can deploy from your wallet.</div>
    </a>

    <a href="/evm/tools/hardhat" style={{ display: 'block', padding: '18px', borderRadius: '10px', border: '1px solid rgba(255,255,255,0.08)', background: 'rgba(255,255,255,0.02)', textDecoration: 'none' }}>
      <div style={{ fontWeight: 500, fontSize: '0.875rem', color: 'var(--landing-fg-primary)', marginBottom: '4px' }}>Move to Hardhat</div>
      <div style={{ fontSize: '0.8125rem', color: 'var(--landing-fg-tertiary, rgba(255,255,255,0.55))', lineHeight: 1.45 }}>When you're ready for tests, CI, and a real codebase, port your contract into a Hardhat project.</div>
    </a>

    <a href="/evm/tools/foundry" style={{ display: 'block', padding: '18px', borderRadius: '10px', border: '1px solid rgba(255,255,255,0.08)', background: 'rgba(255,255,255,0.02)', textDecoration: 'none' }}>
      <div style={{ fontWeight: 500, fontSize: '0.875rem', color: 'var(--landing-fg-primary)', marginBottom: '4px' }}>Or try Foundry</div>
      <div style={{ fontSize: '0.8125rem', color: 'var(--landing-fg-tertiary, rgba(255,255,255,0.55))', lineHeight: 1.45 }}>Prefer a Solidity-native, fast test runner? Use Foundry instead. An HTS-aware forking included.</div>
    </a>
  </div>
</div>