What is the Polymarket CLOB?
💡 Definition: Polymarket CLOB
The Polymarket CLOB (Central Limit Order Book) is a hybrid high-performance exchange architecture. It matches bids and asks off-chain with sub-millisecond latency while settling transactions on-chain via Polygon smart contracts using cryptographic EIP-712 order signatures.
0% Maker Fees vs Taker Fees
Unlike automated market maker (AMM) pools that incur high liquidity provider slippage, the Polymarket CLOB incentivizes liquidity makers with 0% trading fees on passive limit orders. Our bot posts passive limit orders exclusively, qualifying for zero maker fees and earning the complete spread on each 15-minute complete-set turn.
Cryptographic EIP-712 Order Structure
Each order sent to the CLOB consists of a typed data structure signed locally by your private key:
- Maker: Your public Polygon wallet address.
- Taker: Null address (allowing open matching).
- TokenId: Specific conditional token outcome identifier (Up or Down).
- MakerAmount / TakerAmount: Order size and price ratio.
- Salt & Expiration: Prevents replay attacks and ensures automatic order expiry.