I have a simple Escrow contract that I've deployed using testrpc. I'm not sure how to interact with the methods once I've created an initialized a new one.

Here's the contract:

pragma solidity ^0.4.4;

contract Escrow {

address public buyer;
address public seller;
address public arbiter;

  function Escrow(address _seller, address _arbiter) {
    buyer = msg.sender;
    seller = _seller;
    arbiter = _arbiter;

  function payoutToSeller() {
    if(msg.sender == buyer || msg.sender == arbiter) {

  function refundToBuyer() {
    if(msg.sender == seller || msg.sender == arbiter) {

  function getBalance() constant returns (uint) {
    return this.balance;

Console returns the following when I create a new instance of my escrow contract:

Escrow.new([acct2, acct3]).then(function(instance) { console.log(instance.address);})

So it seems to have worked. My question is how do I interact with that contract to send it some value? Similar to how I would with a deployed MetaCoin contract using something like MetaCoin.deployed().then(function(instance) { return instance.sendCoin(acct1, 10, {from: acct2});})?

Also, who is the msg.sender in this case?

Thank you for any help.

UPDATE - Setting address = Escrow.new([acct2, acct3]).then(function(instance) { return instance.address;})

Trying to add contract address to Escrow.at(address) and receiving the following error Error: Invalid address passed to Escrow.at(): [object Promise]. Also have tried Escrow.at(address).get() and getting the same error. Thank you.

1 Answer 1


First in order for your contract to accept eth you need to implement a fallback function:

function() payable {}

Then you can send some eth to your contract:

web3.eth.sendTransaction({from:accounts[0], to:"YOUR_CONTRACT_ADDRESS", value: web3.toWei(1, "ether")});

And call contract methods:


This call follows your example using acc3 which was defined as arbiter in contract constructor as the account who publish the transaction.

  • Thank you Jakub. Having an issue still. address = Escrow.new([acct2, acct3]).then(function(instance) {return instance.address;}) returns '0xcc63a4e6d0c487476719972fb4b6b70b0cdd646d' When I web3.eth.sendTransaction({from:acct1, to:address, value:web3.toWei(1, "ether")}); I'm getting Error: invalid address. I've added the fallback function and recompiled everything. Commented Jul 5, 2017 at 14:15
  • 1
    I see. You need to assign the address inside the body of promise: Escrow.new([acct2, acct3]).then(function(instance) { address = instance.address;}) Commented Jul 5, 2017 at 14:17
  • That worked. Thank you! One more question if you don't mind. Who is msg.sender when I call the new() method? Commented Jul 5, 2017 at 14:19
  • 1
    If you don't put an object that specifies the sender {from: SENDER} in the constructor it's going to be the default account: web.eth.accounts[0]. Commented Jul 5, 2017 at 14:21

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