# Mellow API

> API documentation for Mellow product costs. / Mellow 产品成本 API 文档。

## Docs

- [Mellow Product Costs API](https://docs.mellow.billgateai.com/): Read the four product-cost columns used by Mellow's product-profit report.
- [Quickstart](https://docs.mellow.billgateai.com/quickstart): Make your first product-cost request in five minutes.
- [Authentication](https://docs.mellow.billgateai.com/authentication): Authenticate with the dedicated Bearer API key safely.
- [Cost semantics](https://docs.mellow.billgateai.com/cost-semantics): Understand the date range, segments, four costs, and missing values.
- [Errors and troubleshooting](https://docs.mellow.billgateai.com/errors): Interpret API errors and resolve common Playground failures.
- [Changelog](https://docs.mellow.billgateai.com/changelog): Changes to the public Mellow Product Costs API.

## Api Reference

- [Mellow Product Costs API](https://docs.mellow.billgateai.com/api-reference)

### external

- [List product costs / 获取产品四项成本](https://docs.mellow.billgateai.com/api-reference/external/listproductcosts)

## 简体中文

### Docs

- [Mellow 产品成本 API](https://docs.mellow.billgateai.com/zh): 获取 Mellow 产品利润报表使用的四项产品成本。
- [快速开始](https://docs.mellow.billgateai.com/zh/quickstart): 在五分钟内完成第一次产品成本请求。
- [认证](https://docs.mellow.billgateai.com/zh/authentication): 安全使用专用 Bearer API Key。
- [成本口径](https://docs.mellow.billgateai.com/zh/cost-semantics): 理解日期、产品范围、四项成本以及缺失值。
- [错误与排查](https://docs.mellow.billgateai.com/zh/errors): 理解 API 错误并处理 Playground 常见问题。
- [变更记录](https://docs.mellow.billgateai.com/zh/changelog): Mellow 产品成本公开 API 的版本变化。