Single-file 0x v4 Limit Order “DEX”

This creates 0x v4 Limit Orders by: (1) approving the 0x Exchange Proxy for your maker token, (2) EIP-712 signing a LimitOrder, (3) submitting it to the 0x Orderbook API. (The “swap API” is mainly for market swaps; limit orders live on the orderbook API.)

0x API Key (optional / often required)

Sent as header 0x-api-key.

Network

Wallet

Not connected

Limit Order Inputs (custom ERC-20 by address)

Maker token (ERC-20 address you GIVE)

Example: USDC address on your chain.

Taker token (ERC-20 address you GET)

Maker amount (human units)

Taker amount (human units)

Expiry (minutes from now)

Taker address (optional; default open to anyone)

Exchange Proxy (verifyingContract) override (optional)

Used for EIP-712 domain verifyingContract.

Approval spender is the 0x Exchange Proxy. After you submit, the order appears in the 0x orderbook for others to fill.

Status / Output

Ready.

0x Protocol v4 Limit Orders (single-file UI)

Limit Order Inputs (custom ERC-20 by address)

Status / Output