# 介绍

Open Standard API是Relation Protocol的API规范，他在继承了[EIP-6239](http://eips.ethereum.org/EIPS/eip-6239)的基础上，额外定义了一些业务接口。

Open Standard API是`Contact Open Standard`的基础，开发者通过实现`Open Standard API`，即可接入Relation Protocol。

它主要分两部分

* EIP6239规范部分：该部分约定了合约的形态，也是实现业务接口的前提。
* 业务接口定义部分：该部分约定了社交的业务行为。


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