# How to assure a contract address is ERC20 compliant?

**URL:** <https://forum.openzeppelin.com/t/how-to-assure-a-contract-address-is-erc20-compliant/1442>\
**Category:** Support\
**Created:** [September 30, 2019, 7:56pm UTC](https://forum.openzeppelin.com/t/how-to-assure-a-contract-address-is-erc20-compliant/1442 "2019-09-30T19:56:03Z")\
**Posts on this page:** 1\
**Showing post:** 5

<div class="post-metadata">

**Author:** ![abcoathup](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/abcoathup/32/415_2.png) [@abcoathup](https://forum.openzeppelin.com/u/abcoathup)\
**Post date:** [October 21, 2019, 12:57am UTC](https://forum.openzeppelin.com/t/how-to-assure-a-contract-address-is-erc20-compliant/1442/5 "2019-10-21T00:57:13Z")

</div>

Hi @realisation,

I thought the Online ERC20 Contract Verifier might be of interest:

> [@Online ERC20 contract verifier](https://forum.openzeppelin.com/t/online-erc20-contract-verifier/1575):
>
> Integrating ERC20 tokens in an app has usually been the source of unexpected issues, due to contracts not properly adhering to the standard. [Nacho Mazzara](https://twitter.com/nachomazzara) from Decentraland [wrote about this](https://decentraland.org/blog/technology/safe-erc20-transfers/) almost a year ago. And with DeFi composability on the rise in the past few months, these problems are surfacing more and more often. We heard a lot of complaints about this recently in Devcon as well. To help with this, we took a few hours off from our daily tasks and decided to repurpose a verifier tool b…

---

_[View the full topic](https://forum.openzeppelin.com/t/how-to-assure-a-contract-address-is-erc20-compliant/1442)._