# 通过 REST API 购买

- [使用签名交易 (Signed tx)](/chinese/developer/rest-api-v0/buy-on-rest-api/use-signed-transaction.md)
- [估算TRX](/chinese/developer/rest-api-v0/buy-on-rest-api/use-signed-transaction/estimate-trx.md)
- [获取已签名交易](/chinese/developer/rest-api-v0/buy-on-rest-api/use-signed-transaction/get-signed-transaction.md)
- [创建订单](/chinese/developer/rest-api-v0/buy-on-rest-api/use-signed-transaction/create-order.md)
- [Demo](/chinese/developer/rest-api-v0/buy-on-rest-api/use-signed-transaction/demo.md)
- [使用 API 密钥](/chinese/developer/rest-api-v0/buy-on-rest-api/use-api-key.md)
- [获取内部账户信息](/chinese/developer/rest-api-v0/buy-on-rest-api/use-api-key/get-internal-account-info.md)
- [获取订单簿 (Order book)](/chinese/developer/rest-api-v0/buy-on-rest-api/use-api-key/get-order-book.md)
- [获取估算 TRX (Estimate TRX)](/chinese/developer/rest-api-v0/buy-on-rest-api/use-api-key/use-signed-transaction.md)
- [购买能源](/chinese/developer/rest-api-v0/buy-on-rest-api/use-api-key/buy-energy.md)
- [获取单个订单详情](/chinese/developer/rest-api-v0/buy-on-rest-api/use-api-key/get-one-order-details.md)
- [获取内部账户订单历史](/chinese/developer/rest-api-v0/buy-on-rest-api/use-api-key/get-internal-account-order-history.md)