I am trying to send message from Etherenium Sepolia Smart Contract to Solana Testnet through Hypelane. Program on Ethereum Sepolia // SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.13; ...

I'm writing an ERC20-based contract in Solidity 0.8.21. When I call transferFrom, the transaction reverts even though the allowance and balance are sufficient. Here’s a simplified example: function ...

There's a few different ways of accessing dapp providers, but one of the most standard ways to check everything's good in the context you're running things is with a bog standard, window....

Im working on a smart contract in solidity and im having issues with Chainlink function execution. I have this source code for the function: string private functionCode = "return Functions....

I have an NFT marketplace contract running on a local Hardhat node. The function below returns an array of structs: struct MarketItem { uint256 tokenId; address payable seller; address ...

I have two contracts, A and B. Contract A defines my token. I want to transfer some of these tokens to Contract B. If I understood correctly: First, contract A should have some tokens to be able to ...

I am trying to swap two tokens A and B for which I have created the pool on the Uniswap testnet Sepolia. But in Remix, when I try to execute the swap, it gives an error. Everything else is working ...

I'm trying to interact with a deployed XRC-20 token contract on the XDC Network (EVM-compatible) using Rust and the alloy crate. I have already deployed my token using MetaMask and Remix IDE, and I ...

I'm working on testing a Chainlink VRF-based Raffle contract using Foundry, but I’m encountering a EvmError: Revert when running the test that checks whether the raffle correctly blocks entries while ...

I'm currently working on a meta-transaction system using a custom SimpleAccount contract (not based on standard ERC-4337 — no UserOperation, EntryPoint.handleOps, etc.). The goal is to make a smart ...

When trying to send a signed transaction on Harmony ONE, I receive the following error: rlp: input string too long for uint32, decoding into (types.Transaction)(types.txdata).ShardID This happens ...

I’m testing a Solidity smart contract for a project. A user buys a short-term policy that expires in 5 seconds. After advancing blockchain time by 10 seconds, I try to call claim(), but the ...

I used web3auth and web3dart for a project 6 months ago, I need to update the project now and after updating to the latest version of web3dart (3.0.1, also tried 3.0.0), it shows some classes (...

Here is my contracts: // SPDX-License-Identifier: LGPL-3.0-only pragma solidity ^0.8.20; import "hardhat/console.sol"; // import console.log; interface ISafe { ...

I have a question regarding contract size limits on Ethereum. Suppose I have a smart contract whose size has increased by 24,945 bytes — does that mean it can no longer be deployed on the Ethereum ...