bsc-pancakeswap

name	bsc-pancakeswap
description	PancakeSwap DEX trading on BSC — swap workflows, pre-flight safety checks, slippage/liquidity rules, and common token addresses. Read this before any DEX swap operation. Signing is handled by goo-bsc-wallet.

PancakeSwap DEX Trading

This skill covers how to execute swaps on PancakeSwap V2. All signing and broadcasting go through goo-core wallet tools — see skills/goo-bsc-wallet/SKILL.md for wallet tools and risk rules.

Architecture

This Skill (knowledge only)           goo-core wallet layer
───────────────────────               ─────────────────────
Swap workflow guidance                 bsc_prepare_tx
Pre-flight checks (slippage, etc.)     bsc_analyze_tx  ← tx-risk-analyzer.ts
Token addresses & router ABI           bsc_sign_and_send_tx ← wallet signing
                                       bsc_wallet_overview  (verify)

This skill provides no tools — it is pure knowledge. You build swap calldata using ethers.js and the Router ABI, then sign via goo-core wallet tools.

Swap Methods (PancakeSwap V2 Router)

Method	Use case	value
swapExactETHForTokens	BNB -> Token	amountIn
swapExactTokensForETH	Token -> BNB (approve first)	0
swapExactTokensForTokens	Token -> Token (approve first)	0
swapTokensForExactTokens	Token -> Token, exact output (approve first)	0

Swap Workflows

BNB -> Token

1. bsc_wallet_overview — confirm BNB covers swap amount + gas
2. Check token contract responds to symbol() / decimals() (honeypot filter)
3. Check pair exists with non-zero reserves
4. Get quote via getAmountsOut — apply pre-flight checks (see below)
5. Build calldata: router.swapExactETHForTokens(amountOutMin, [WBNB, token], to, deadline)
6. bsc_sign_and_send_tx with value = amountIn
7. bsc_wallet_overview — verify balance change

Token -> BNB (requires approve)

1. Steps 1-4 as above (reverse direction)
2. Approve: build token.approve(ROUTER, exactAmount) — never use MaxUint256
3. bsc_sign_and_send_tx the approve tx
4. Build calldata: router.swapExactTokensForETH(amountIn, amountOutMin, [token, WBNB], to, deadline)
5. bsc_sign_and_send_tx the swap tx
6. bsc_wallet_overview — verify

Token -> Token (multi-hop)

Path: [tokenA, WBNB, tokenB] when no direct pair exists. Flow: approve tokenA -> swap via multi-hop path. Same as Token -> BNB but with extended path.

DEX Pre-Flight Checks

Run these before building the swap transaction:

Check	Condition	Action
Honeypot detection	Contract doesn't respond to symbol() / decimals()	Stop
No liquidity	Pair reserves = 0	Stop
Extreme slippage	> 15%	Stop
High slippage	5-15%	Warn
Large swap	> 50% of your balance	Warn
Pool impact	Swap > 10% of pool liquidity	Warn
Gas cost ratio	Gas > 5% of swap value	Warn

These checks are instruction-layer guidance. Even if bypassed, goo-core's tx-risk-analyzer.ts still enforces code-level risk analysis at signing time (see skills/goo-bsc-wallet/SKILL.md).

Security Rules (DEX-specific)

1. Exact approvals only — always approve the exact swap amount, never MaxUint256.
2. Deadline protection — set deadline to current time + 5 minutes on every swap.
3. Slippage limits — set amountOutMin based on quote minus acceptable slippage (default: 1-3%).
4. Verify after swap — always call bsc_wallet_overview after to confirm balance changes.
5. No V3 — this skill covers PancakeSwap V2 only.

For general wallet security rules (private key isolation, risk analysis, gas preservation), see skills/goo-bsc-wallet/SKILL.md.

Common Token Addresses

BSC Mainnet

Token	Address
WBNB	0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c
USDT	0x55d398326f99059fF775485246999027B3197955
BUSD	0xe9e7CEA3DedcA5984780Bafc599bD69ADd087D56
USDC	0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d
PancakeSwap V2 Router	0x10ED43C718714eb63d5aA57B78B54704E256024E

BSC Testnet

Token	Address
WBNB	0xae13d989daC2f0dEbFf460aC112a837C89BAa7cd
PancakeSwap V2 Router	0xD99D1c33F9fC3444f8101754aBC46c52416550D1