合约交易是指买卖双方对约定未来某个时间按指定价格接收一定数量的某种资产的协议进行交易,合约交易的买卖对象是由交易所统一制定的标准化合约，交易所规定了其商品种类，交易时间，数量等标准化信息。合约代表了买卖双方所拥有的权利和义务。

简单点说就是：现在约好未来某个时间地点交易一定数量的某种商品。

{
"description": "This NFT proves I've created and deployed my first ERC20 smart contract on Rinkeby with Alchemy Road to Web3",
"external_url": "http://Alchemy.com",
"image": "https://ipfs.filebase.io/ipfs/bafybeihyvhgbcov2nmvbnveunoodokme5eb42uekrqowxdennt2qyeculm",
"name": "A cool NFT",
"attributes": [
{
"trait_type": "Base",
"value": "Starfish"
},
{
"trait_type": "Eyes",
"value": "Big"
},
{
"trait_type": "Mouth",
"value": "Surprised"
},
{

Contract trading refers to the agreement between the buyer and the seller to receive a certain amount of certain assets at a certain price in the future. The buying and selling object of the contract trading is a standardized contract uniformly formulated by the exchange, and the exchange stipulates the standardized information such as commodity type, trading time and quantity. The contract represents the rights and obligations of both the buyer and the seller. Simply put: now trade a certain number of goods at a certain time and place in the future.