> For the complete documentation index, see [llms.txt](https://docs.zk.link/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zk.link/developer/sdk/changelog-1/transactions/6-contract-matching.md).

# ContractMatching

### type ContractPrice

#### constructor

```javascript
/**
* @param {number} pair_id
* @param {string} market_price
*/
ContractPrice(pair_id, market_price)
```

**input:**

* pair\_id: The contract pair id defined by zkLink.
* market\_price: The market price of the contract pair

### type SpotPriceInfo

#### constructor

```javascript
/**
* @param {number} token_id
* @param {string} price
*/
SpotPriceInfo(token_id, price)
```

**input:**

* token\_id: The token id defined by zkLink.
* price: The spot price of the token.

### type ContractBuilder

#### constructor

```javascript
/**
* @param {number} account_id
* @param {number} sub_account_id
* @param {number} slot_id
* @param {number} nonce
* @param {number} pair_id
* @param {string} size
* @param {string} price
* @param {boolean} direction
* @param {number} maker_fee_rate
* @param {number} taker_fee_rate
* @param {boolean} has_subsidy
*/
ContractBuilder(account_id, sub_account_id, slot_id, nonce, pair_id, size, price, direction, maker_fee_rate, taker_fee_rate, has_subsidy)
```

### type Contract

The [Contract](/developer/api-and-sdk/transaction/contract_matching.md) struct of taker and maker in perpetual contract.

#### constructor

```javascript
/**
* @param {ContractBuilder} builder
*/
newContract(builder)
```

#### func sign

```javascript
/**
* @param {ZkLinkSigner} signer
* @returns {any}
*/
sign(signer)
```

Sign contract with given [ZkLinkSigner](/developer/sdk/changelog-1/signer.md#type-zklinksigner)

### type ContractMatchingBuilder

#### constructor

```javascript
/**
* @param {number} account_id
* @param {number} sub_account_id
* @param {Contract} taker
* @param {Contract[]} maker
* @param {string} fee
* @param {number} fee_token
* @param {ContractPrice[]} contract_prices
* @param {SpotPriceInfo[]} margin_prices
*/
ContractMatchingBuilder(account_id, sub_account_id, taker, maker, fee, fee_token, contract_prices, margin_prices)
```

### type ContractMatching

[ContractMatching](/developer/api-and-sdk/transaction/contract_matching.md) transaction type.

#### constructor

```javascript
/**
* @param {ContractMatchingBuilder} builder
*/
newContractMatching(builder)
```

#### func sign

```javascript
/**
* @param {ZkLinkSigner} signer
* @returns {any}
*/
sign(signer)
```

Sign transaction with given [ZkLinkSigner](/developer/sdk/changelog-1/signer.md#type-zklinksigner)