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Ethereum: revocable contract functionality does not exist in ABI

Published by Terlumun Aondover on February 5th, 2025.

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Error: Callable contract function not found in ABI

As a developer of Etherchain-based contracts, including NFTs on platforms like Sea Drop and OpenSea, you are probably no stranger to the complexities of working with the Ethereum Virtual Machine (EVM) and its Application Binary Interface (Abi) standard. Recently, I encountered an error that made me question whether my contract function exists in the ABI.

The problem: Non-existent function

When I deployed a callable contract to Sepolia Etherscan, I noticed that one of its functions was not recognized by the Etherchain Abi compiler. Specifically, I was trying to use the mint function from the Sea Drop OpenSea page, but it was not showing up in my ABI.

The Problem: Undefined Function

To resolve this issue, I followed these steps:

Contract ABI Check

: First, I checked the contract ABI (Application Binary Interface) to make sure the mint function was actually defined.

Check for Missing Functions: Next, I looked at the OpenSea Sea Drop page and noticed that the mint function was not shown in the contract ABI.

Troubleshooting Steps

To resolve this issue, I followed these steps:

Check Contract Code: I carefully examined my contract code to make sure the mint function was defined correctly.

Check for Missing or Undefined Functions: I also checked other contracts and modules on Sepolia Etherscan to identify any potential issues with function definitions.

Check ABI updates: If necessary, I updated the contract ABI to reflect the changes on the Sea Drop OpenSea page.

Solution: Adding the call function

After checking my contract code and looking at the Sea Drop OpenSea page, I realized that the mint function was not a callable function. To fix this, I added the missing call function from the Sea Drop OpenSea page to my contract ABI.

Here is an updated version of my contract:


pragma solidity ^0.8.0;
contract MyNFTContract {
address of private owner;
uint256 private mintCount = 0;
function mint() public call onlyOwner {
// Mint a new NFT
require(mintCount < 5, "Mint limit passed");
mintCount += 1;
}
}

Conclusion

In this article, I demonstrated how to debug and troubleshoot a callable contract function that is missing from its ABI. By verifying the contract ABI, reviewing the Sea Drop OpenSea page, updating the ABI, and adding missing functions, we can ensure that our contracts work as expected.

As an Etherchain contract developer, it is essential to stay up to date with the latest developments and industry best practices. In this case, I learned the importance of verifying contract function definitions and reviewing external sources for information about other contracts on Sepolia Etherscan.