Call Contract Endpoint

Interact easily with Smart Contracts with this endpoint

POST localhost:9680/callContract


  • contractAddress - string Contract address to interact with
  • functionName - string Smart contract function to interact with
  • abi - Array<AbiItem> (Optional) ABI of the contract to call
  • params - Array<string> (Optional) Params to call the smart contract function with
  • valueInWei - string (Optional) Amount of wei to send
  • gasLimit - string (Optional) Gas limit for the function call
  • chain - Object used to ensure the user is on the correct chain (follows the MetaMask specification)
    • chainId - string Base 10 string matching the chain id on Chainlist
    • chainMetadata (Optional) - Object used to add the chain if the user does not have the chain added to their wallet
      • chainName - string
      • nativeCurrency - Object
        • name - string is the currency's name
        • symbol - string 2-6 characters long symbol for the chain
        • decimals - 18
      • rpcUrls - Array<string> is an array of rpc node urls that can be used to make requests. We recommend selecting a few from the listing on Chainlist
      • blockExplorerUrls (Optional) - Array<string> is an array of block explorers that can be used with the chain
      • iconUrls (Optional) - Array<string> is currently unused by MetaMask


Mixed - the return value(s) of the smart contract method. If it returns a single value, it’s returned as is. If it has multiple return values they are returned as an object with properties and indices:


// Solidity
contract MyContract {
function myFunction() returns(uint256 myNumber, string myString) {
return (23456, "Hello!%");
// /callContract Result:
> Result {
myNumber: '23456',
myString: 'Hello!%',
0: '23456', // these are here as fallbacks if the name is not know or given
1: 'Hello!%'
// Solidity
contract MyContract {
function myFunction() returns(string myString) {
return "Hello!%";
// /callContract Result:
> "Hello!%"