# Read

This is a generic method for invoking JSON RPC's `eth_call` with Ethers.js. Use this method to execute a smart contract's constant or non-constant member without using gas. This is a read-only method intended to read a value or test a transaction for valid parameters. It does not create a transaction on the block chain.

* `address` (string) The Ethereum address the transaction is directed to.
* `method` (string) The smart contract member in which to invoke.
* `[parameters]` (any\[]) Parameters of the method to invoke.
* `[options]` (CallOptions) Options to set for `eth_call`, optional ABI (as JSON object), and Ethers.js method overrides. The ABI can be a string of the single intended method, an array of many methods, or a JSON object of the ABI generated by a Solidity compiler.
* `RETURN` (Promise\<any>) Return value of the invoked smart contract member or an error object if the call failed.

```
const sEthAddress = Strike.util.getAddress(Strike.sETH);

(async function() {

  const srpb = await Strike.eth.read(
    sEthAddress,
    'function supplyRatePerBlock() returns (uint256)',
    // [], // [optional] parameters
    // {}  // [optional] call options, provider, network, plus Ethers.js "overrides"
  );

  console.log('sETH market supply rate per block:', srpb.toString());

})().catch(console.error);
```


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