> For the complete documentation index, see [llms.txt](/llms.txt). # Send an ERC-20 token In this tutorial we'll use Rust and the [ethers-rs library](https://docs.rs/ethers/latest/ethers/) to send an ERC-20 token from one address to another. This tutorial uses the Sepolia testnet and sends the [Chainlink token (LINK)](https://sepolia.etherscan.io/token/0x779877a7b0d9e8603169ddbd7836e478b4624789#code). ## Prerequisites[​](#prerequisites "Direct link to Prerequisites") - Make sure that you have test LINK in your MetaMask wallet. You can obtain test LINK for the Sepolia network using the [Chainlink faucet](https://faucets.chain.link/). Make sure that the `Ethereum Sepolia` network is selected on the top right of the faucet page when you connect your MetaMask wallet. - [Install Rust from The Cargo Book](https://doc.rust-lang.org/cargo/getting-started/installation.html). ## Send the token[​](#send-the-token "Direct link to Send the token") ### 1\. Create a new project[​](#1-create-a-new-project "Direct link to 1. Create a new project") Open a terminal and create a new project. ``` cargo new infura_rs ``` This creates the `infura_rs` directory with the following structure: ``` infura_rs ├── Cargo.toml └── src └── main.rs ``` info Refer to the [Cargo documentation](https://doc.rust-lang.org/cargo/getting-started/first-steps.html) for more information about getting started with Cargo. ### 2\. Edit the dependencies[​](#2-edit-the-dependencies "Direct link to 2. Edit the dependencies") Open `Cargo.toml` with your preferred editor and add the following dependencies to it: ``` [dependencies] ethers = "2.0" eyre = "0.6.8" hex = "0.4.3" tokio = { version = "1.28.2", features = ["full"] } serde_json = "1.0.96" ``` ### 3\. Copy the contract ABI[​](#3-copy-the-contract-abi "Direct link to 3. Copy the contract ABI") - Create a text file with the name `ct.json` in the `infura-rs` project directory. Visit the [ChainLink Token site on Etherscan](https://sepolia.etherscan.io/token/0x779877a7b0d9e8603169ddbd7836e478b4624789#code) and copy the `Contract ABI` (you will see it in a bottom section of the page) into the `ct.json` file. ### 4\. Update the main code[​](#4-update-the-main-code "Direct link to 4. Update the main code") Open the Rust source `src/main.rs` and replace its contents with the following code: ``` use ethers::{ middleware::SignerMiddleware, providers::{Http, Middleware, Provider}, signers::{LocalWallet, Signer}, types::{Address, U256}, contract::abigen }; use eyre::Result; use std::convert::TryFrom; use std::sync::Arc; use serde_json::Value; #[tokio::main] async fn main() -> Result<()> { // connect to the network, don't forget to replace your INFURA_API_KEY let provider = Provider::::try_from("https://sepolia.infura.io/v3/INFURA_API_KEY")?; let chain_id = provider.get_chainid().await?; let contract_address = "0x779877A7B0D9E8603169DdbD7836e478b4624789".parse::
()?; // define a `ERC20Contract` struct from the ABI abigen!(ERC20Contract, "./ct.json",); let to_address = "0xF1B792820b52e6503208CAb98ec0B7b89ac64D6A".parse::
()?; // Create the contract instance to let us call methods of the contract and let it sign transactions with the sender wallet. // for simplicity replace the private key (without 0x), ofc it always recommended to load it from an .env file or external vault let wallet: LocalWallet = "SIGNER_PRIVATE_KEY" .parse::()? .with_chain_id(chain_id.as_u64()); let signer = Arc::new(SignerMiddleware::new(provider, wallet.with_chain_id(chain_id.as_u64()))); let contract = ERC20Contract::new(contract_address, signer); // Fetch the decimals used by the contract so we can compute the decimal amount to send. let whole_amount: u64 = 1; let decimals = contract.decimals().call().await?; let decimal_amount = U256::from(whole_amount) * U256::exp10(decimals as usize); // Transfer the desired amount of tokens to the `to_address` let tx = contract.transfer(to_address, decimal_amount); let pending_tx = tx.send().await?; let _mined_tx = pending_tx.await?; println!("Transaction Receipt: {}", serde_json::to_string(&_mined_tx)?); // Extract the tx hash for printing let json_str = serde_json::to_string(&_mined_tx)?; let json: Value = serde_json::from_str(&json_str)?; if let Some(transaction_hash) = json["transactionHash"].as_str() { println!("\n URL: https://sepolia.etherscan.io/tx/{}", transaction_hash); } else { println!("Transaction Hash not found"); } Ok(()) } ``` Next, make the following updates to the above code: - On line 17 replace the `INFURA_API_KEY` with the API key of your API project from the [Infura dashboard](https://app.infura.io/login). - On line 30 replace the `SIGNER_PRIVATE_KEY` with the private key of your Ethereum account. Secure your keys To better secure your keys, follow the recommended approach described in the section [Create the .env file](/services/tutorials/ethereum/send-a-transaction/use-web3.js/#4-create-a-env-file). ### 4\. Run the code[​](#4-run-the-code "Direct link to 4. Run the code") From the `infura_rs` directory, run the code. ``` cargo run ``` You will see an output similar to the following. Use the wrap button Use the wrap button on the top right of the below code block window for wrapped display. ``` Finished dev [unoptimized + debuginfo] target(s) in 0.31s Running `target/debug/infura_rs` Transaction Receipt: {"transactionHash":"0x301ae601943c5a1822886bf36e58c289ef942ca4bb08226ea3090b685aef9c7e","transactionIndex":"0x4","blockHash":"0xba6c880b14a7927ed2b6a5ac4e434d13d051dc770fe5f68666bb4d9b9ee1faed","blockNumber":"0x3a91b7","from":"0xe33fef60722ba79989aeaa1b6e6daf7f351c0fbb","to":"0x779877a7b0d9e8603169ddbd7836e478b4624789","cumulativeGasUsed":"0xd4673","gasUsed":"0x86fe","contractAddress":null,"logs":[{"address":"0x779877a7b0d9e8603169ddbd7836e478b4624789","topics":["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef","0x000000000000000000000000e33fef60722ba79989aeaa1b6e6daf7f351c0fbb","0x000000000000000000000000f1b792820b52e6503208cab98ec0b7b89ac64d6a"],"data":"0x0000000000000000000000000000000000000000000000000de0b6b3a7640000","blockHash":"0xba6c880b14a7927ed2b6a5ac4e434d13d051dc770fe5f68666bb4d9b9ee1faed","blockNumber":"0x3a91b7","transactionHash":"0x301ae601943c5a1822886bf36e58c289ef942ca4bb08226ea3090b685aef9c7e","transactionIndex":"0x4","logIndex":"0x7","removed":false}],"status":"0x1","logsBloom":"0x00000004000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000002000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000040000001000000800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000082000000000000000000000000000000008000000100000000000000000000000000008000000000000000000000000000000000000000000000000000","type":"0x2","effectiveGasPrice":"0xb2d05e09"} URL: https://sepolia.etherscan.io/tx/0x301ae601943c5a1822886bf36e58c289ef942ca4bb08226ea3090b685aef9c7e ``` Visit the URL displayed at the bottom of the above terminal log to confirm the transfer of the LINK token.