ZeroEx Swap Skill

⚠️ SECURITY WARNING: This skill involves real funds. Review all parameters before executing swaps.

Install

cd skills/zeroex-swap
npm install

Required Environment Variables

Variable	Description	Required
ZEROEX_API_KEY	Get from https://dashboard.0x.org/	Yes
PRIVATE_KEY	Wallet private key (hex, without 0x prefix)	Yes
RPC_URL	RPC endpoint for chain (optional, defaults provided)	No

Declared required env vars: ZEROEX_API_KEY, PRIVATE_KEY

export ZEROEX_API_KEY="your-0x-api-key"
export PRIVATE_KEY="your-private-key-hex"
export RPC_URL="https://mainnet.base.org"  # optional

Usage

Get Price Quote

node quote.js --sell USDC --buy WETH --amount 1 --chain base

Execute Swap (sell → buy)

node swap.js --sell USDC --buy WETH --amount 1 --chain base

Execute Swap (buy example)

node swap.js --sell WETH --buy USDC --amount 0.01 --chain base

Trade History

getSwapTrades

curl -s "https://api.0x.org/trade-analytics/swap?chainId=8453&taker=0xYOUR_WALLET" \
  -H "0x-api-key: $ZEROEX_API_KEY" \
  -H "0x-version: v2"

getGaslessTrades

curl -s "https://api.0x.org/trade-analytics/gasless?chainId=8453&taker=0xYOUR_WALLET" \
  -H "0x-api-key: $ZEROEX_API_KEY" \
  -H "0x-version: v2"

Gasless Swap (Meta-transaction)

Flow:

1. Get gasless quote
2. Sign EIP-712 payload
3. Submit meta-tx

1) Get gasless quote

curl -s "https://api.0x.org/gasless/quote?sellToken=USDC&buyToken=WETH&sellAmount=1000000&chainId=8453&taker=0xYOUR_WALLET" \
  -H "0x-api-key: $ZEROEX_API_KEY" \
  -H "0x-version: v2"

2) Sign EIP-712 (use viem)

// use viem to sign quote.trade.eip712
await client.signTypedData({
  domain: quote.trade.eip712.domain,
  types: quote.trade.eip712.types,
  message: quote.trade.eip712.message,
  primaryType: quote.trade.eip712.primaryType
});

3) Submit

curl -s -X POST "https://api.0x.org/gasless/submit" \
  -H "0x-api-key: $ZEROEX_API_KEY" \
  -H "0x-version: v2" \
  -H "Content-Type: application/json" \
  -d '{"trade": {"type":"settler_metatransaction","eip712": {"domain": {"name": "Settler", "chainId": 8453, "verifyingContract": "0x..."},"types": {...},"message": {...},"primaryType":"..."},"signature": {"v": 27, "r": "0x...", "s": "0x...", "signatureType": 2}}}'

Security Best Practices

• Use a dedicated hot wallet
• Set slippage protection
• Approve exact amounts only
• Use your own RPC via RPC_URL