Contracts

Simulate Call

Execute a read-only contract call (eth_call) without submitting a transaction. Use this to read contract state, test function calls, or preview transaction results.

The data parameter should be the ABI-encoded function selector and arguments. For example, to call balanceOf(address) on an ERC-20:

Function selector: 0x70a08231
Address padded to 32 bytes: 000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045

simulateCall

Executes a contract call locally without sending a transaction (eth_call). Returns the raw return data. Useful for reading contract state, testing function calls, or simulating transactions before submission.

curl -X POST https://your-endpoint.simplystaking.xyz/v1 \
  -H "Content-Type: application/json" \

{
  "jsonrpc": "2.0",
  "method": "simulateCall",
  "params": {
    "chain": "ethereum",
    "to": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "data": "0x70a08231000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045"
  },
  "id": 1
}

Parameters

Name	Required	Description
chain	yes	Network slug
to	yes	Contract address e.g. 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
data	yes	ABI-encoded function call data e.g. 0x70a08231000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045
from	no	Caller address
value	no	ETH value in hex wei
block	no	Block number (hex) or "latest"

Response Fields

Field	Type
`data`	object
`chain`	string
`result`	string

Supported Networks

EthereumPolygonBNB ChainOptimismBaseAvalancheArbitrumGnosisMoonbeamLineaHyperliquid

Try It

Base URL

Chain

to *

data *

from

value

block

JSON-RPC Body

{
  "jsonrpc": "2.0",
  "method": "simulateCall",
  "params": {
    "chain": "ethereum",
    "to": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "data": "0x70a08231000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045"
  },
  "id": 1
}

Get Contract Code

Check whether an address is a contract or an EOA. Returns the deployed bytecode and its size in bytes.

getCode

Returns the bytecode deployed at an address. If the result is "0x", the address is an EOA (externally owned account), not a contract. Also returns the bytecode size in bytes.

curl -X POST https://your-endpoint.simplystaking.xyz/v1 \
  -H "Content-Type: application/json" \

{
  "jsonrpc": "2.0",
  "method": "getCode",
  "params": {
    "chain": "ethereum",
    "address": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "blockHeight": 19834521
  },
  "id": 1
}