ABI Page Builder
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    How to Call Smart Contract Functions Using an ABI

    The ABI tells your tools what functions exist on a contract. Here's how to use it to call any function — read or write — directly from your browser.

    What Is an ABI?

    An ABI (Application Binary Interface) is a JSON array that describes a smart contract's functions, events, and their parameters. It's the bridge between human-readable function names and the bytecode the EVM understands.

    [
  {
    "type": "function",
    "name": "balanceOf",
    "stateMutability": "view",
    "inputs": [{ "name": "account", "type": "address" }],
    "outputs": [{ "name": "", "type": "uint256" }]
  }
]

    Where to Get Your ABI

    • Etherscan — go to the "Contract" tab of a verified contract and copy the ABI JSON
    • Hardhat — find it in artifacts/contracts/YourContract.sol/YourContract.json under the "abi" key
    • Foundry — find it in out/YourContract.sol/YourContract.json
    • Remix IDE — after compiling, copy the ABI from the "Compilation Details" panel

    Read Functions vs Write Functions

    AspectRead (view/pure)Write (nonpayable/payable)
    Gas costFreeRequires gas
    Wallet neededNoYes
    Changes stateNoYes
    Returns dataImmediatelyAfter confirmation

    Step-by-Step: Call a Function

    1

    Get your ABI JSON

    Copy the ABI from Etherscan's "Contract" tab, your Hardhat/Foundry build artifacts, or Remix IDE.

    2

    Open ABI Page Builder

    Go to abipagebuilder.com and paste the ABI JSON into the text area.

    3

    Enter contract address

    Paste the deployed contract address (0x...) into the address field.

    4

    Select a network

    Choose from built-in presets (Ethereum, Polygon, Arbitrum, etc.) or enter a custom RPC URL and chain ID.

    5

    Call a view function

    Click "Generate Page." All read functions appear as cards. Fill in parameters (if any) and click "Read" to see the result — no wallet needed.

    6

    Send a write transaction

    Connect your wallet (MetaMask, WalletConnect, etc.), fill in function parameters, and click "Write" to submit the transaction.

    Tips: Custom RPC for Private or Testnet Chains

    If your contract is deployed on a chain not in the preset list — a private devnet, an L2 testnet, or any custom EVM network — select "Custom RPC" in the network dropdown. Enter your RPC URL and chain ID, and ABI Page Builder will route all calls through your endpoint. This works with any JSON-RPC compatible node.

    👉 Ready to call your first function?

    Try It Now

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