# bot • [](https://github.com/refcell/subway-rs/actions/workflows/ci.yaml)  A Highly Optimized Sandwich Bot Built with Pure Rust and Huff. > **Note** > > Test in prod > something Zuck Gobble Fast > lose all your ETH > i accidentally broke it ### Usage Required Preparation: 1. Install [rust](https://www.rust-lang.org/tools/install) if it's not already installed. 2. Deploy a sandwich contract from the [contracts](../contracts/) directory, or re-use an existing one. 3. Create a `.env` file and set the required variables, referencing the below environment variables. (NOTE: we've added `.env` and `.env.prod` to the `.gitignore` file, so you don't accidentally commit your secrets to the repo. All other secret commits are on you. Exercise caution.) > **Warning** > > Some providers do NOT support all the RPC methods used by the bot. > > For instance, it is not possible to use infura to listen to pending transactions because `eth_newPendingTransactionFilter` is not supported. ```ignore RPC_URL=http://127.0.0.1:8545 RPC_URL_WSS=ws://127.0.0.1:8545 PRIVATE_KEY=0000000000000000000000000000000000000000000000000000000000000001 FLASHBOTS_AUTH_KEY=0000000000000000000000000000000000000000000000000000000000000002 SANDWICH_CONTRACT=0x0000000000000000000000000000000000000000 ``` Then, you can simply run the bot with: ```bash cargo run --bin subway --release ``` And you should be good to go! **Library Usage** To use as a library, add subway-rs as a dependency in your `Cargo.toml`: ```toml [dependencies] subway-rs = "0.5.0" ``` **Benchmarks** To run benchmarks, simply run: ```bash cargo bench ``` Individual benches can be run by supplying the `--bench` flag to cargo with the benchmark name. (e.g. `cargo bench --bench utils`) ### Blueprint ```txt . ├─ src │ ├─ lib.rs — Exported modules with a re-exported prelude. │ ├─ main.rs — The main bot binary. │ ├─ numeric.rs — Refactored functions for numeric operations. │ ├─ relayer.rs — Wrappers for network requests. │ ├─ telemetry.rs — Telemetry for verbose logging. │ ├─ uniswap.rs — Uniswap library. │ └─ utils.rs — Common utilities. └─ tests └─ Tests so exhaustive, it'll knock your (uni)-socks off ``` ### Credits - [subway](https://github.com/libevm/subway) - [flashloan-rs](https://github.com/whitenois3/flashloan-rs)