This project listens for newly created PancakeSwap V2 pairs and, when the WBNB side of the pair is detected, attempts to buy the partner token with a fixed WBNB amount. The trade is executed through the router using a constant slippage buffer to compute amountOutMin before submission.

Warning This bot is created for testing purposes only. It is not optimized for mainnet or real trading, and using real funds may result in losing money.

• Subscribes to the factory’s PairCreated event via go-ethereum filter streams.
• Loads shared ABIs from generated Go bindings (generated/).
• Computes live reserves through the pair contract to quote the output for the fixed trade size.
• Applies a fixed 5 % slippage buffer when computing amountOutMin.
• Executes swapExactETHForTokens on PancakeSwap V2 using an account private key supplied through .env.

• Go 1.25+
• abigen from go-ethereum (go install github.com/ethereum/go-ethereum/cmd/abigen@latest)
• A BSC RPC endpoint with websocket support.
• A funded wallet private key (exported in .env – protect this file!).

• main.go – entrypoint, log subscription, reserve/quote lookups, fixed-slippage trade execution.
• generated/ – Go bindings produced by abigen (UniswapV2Factory, UniswapV2Router, UniswapV2Pair, Erc20).
• abis/ – canonical ABI JSON sources.
• .env.example – required environment variables.

1. Copy environment template

   cp .env.example .env

2. Edit .env

   Variable	Description
   RPC_URL	WebSocket RPC endpoint (e.g. wss://bsc-testnet.nodereal.io/ws/v1/...).
   PRIVATE_KEY	Hex-encoded private key (with or without 0x). Never commit this file.

3. Install dependencies

   go mod tidy

4. Generate Go bindings (only required if ABI changes)

   abigen --abi abis/uniswap-v2-router.json  --pkg generated --type UniswapV2Router --out generated/UniswapV2Router.go
   abigen --abi abis/uniswap-v2-factory.json --pkg generated --type UniswapV2Factory --out generated/UniswapV2Factory.go
   abigen --abi abis/uniswap-v2-pair.json    --pkg generated --type UniswapV2Pair    --out generated/UniswapV2Pair.go
   abigen --abi abis/erc20.json              --pkg generated --type Erc20            --out generated/Erc20.go

go run .

The process will:

1. Load .env and connect to the RPC endpoint.
2. Subscribe to PairCreated events.
3. For each WBNB pair:
   • Fetch reserves from the pair contract.
   • Quote the output via the router.
   • Apply a fixed 5 % slippage buffer to derive amountOutMin.
   • Submit swapExactETHForTokens swapping exactly 0.0005 WBNB.

Console logs include block/transaction identifiers, reserves, expected output, computed slippage, and transaction hashes for successful swaps.

Trade constants live in main.go:

Adjust and rebuild if you need different parameters.

• Format + lint:

  gofmt -w main.go

• Build:

  go build ./...

• Use your own fork / private key for testing; consider running against a mainnet fork (e.g., Hardhat, Anvil) to avoid real losses.