Remix is a comprehensive, web-based integrated development environment (IDE) for smart contract creation and deployment. It caters to developers of all skill levels, serving as both a powerful toolset for the entire contract development lifecycle and an educational platform for learning and experimenting with Ethereum-based technologies.

Our VeChain integration with Remix enables our community to leverage this robust IDE when developing smart contracts and decentralized applications (dApps) on the VeChain blockchain. By providing an RPC proxy, we've made it possible for VeChain developers to seamlessly use Remix's feature-rich environment while targeting the VeChain network, combining the familiarity of Ethereum development tools with the unique advantages of the VeChain ecosystem.

RPC Proxy

The RPC Proxy is designed to bridge the gap between Thor's RESTful API and Ethereum's JSON-RPC, enabling seamless interaction with the VeChainThor blockchain through RPC calls. It is particularly useful for integrating with tools such as the Remix IDE, allowing developers to leverage familiar Ethereum development environments while working on VeChain projects.


To install the RPC proxy, use the following command:

yarn add @vechain/sdk-rpc-proxy


Create a config.json with your desired settings. The configuration file includes the following fields:

  • url: The URL of the VeChain Thor node.

  • port: The port of the proxy server.

  • accounts: The accounts that the proxy server will use to sign transactions (can be a mnemonic or an array of private keys).

  • verbose: Wheter to enable verbose logging.

  • debug: Whether to enable debug mode.

  • enableDelegation: Whether to enable delegation.

Example Configuration

    "url": "",
    "port": 8545,
    "accounts": {
        "mnemonic": "denial kitchen pet squirrel other broom bar gas better priority spoil cross",
        "count": 10
    "verbose": true,
    "enableDelegation": false

If you are launching the RPC Proxy with the provided example configuration, make sure to have Thor running locally in solo mode. Find out more about Thors different options and how to build it here.

If you want to use VeChain testnet or mainnet use the following urls: or and remember also to change the accounts field by passing the correct account you want to use.

Running the Proxy

After creating your configuration file, run the proxy using one of the following commands:

rpc-proxy -c <json config file>


rpc-proxy --config <json config file>

Connecting with Remix IDE


2. Choose Custom - External HTTP provider

3. Choose the URL to your proxy (default is and click Ok

4. Compile and deploy contracts

5. Interact with contracts via provided interface

Known Issues and Workaround

Currently there are some limitations when using this proxy. One of them is the fact that when deploying contracts you could get an error of the following type creation of ContractName errored: [TIMEOUT] Timeout for call deployMetadataOf from udapp. This usually happens after 3 or more deployments one after another.

Fortunately there is a workaround for this, if all contracts are required in the same workspace. When deploying contracts note their address as well as the contract name. When you get the aforementioned error refresh Remix and recompile the contracts. When navigating to the DEPLOY & RUN TRANSACTIONS section instead of re-deploying the contract paste the address in the AtAddress section and it will load from your previous deployment. You can now succesfully interact with a previously deployed contract.

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