> For the complete documentation index, see [llms.txt](https://api-en.stridecross.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://api-en.stridecross.com/basic-information.md).

# Basic information

> This document is mainly used to explain endpoints usage, illustrate with code examples for requesting endpoints, specific interface input parameters and output parameter information

📌 **Authentication and Security Notes**

This API does not require you to apply for or include any standard  `API Key`, `AccessToken`, or `Token` in the request headers.

To identify the request source and provide customized services, you only need to pass the `sourceflag`  parameter in the regular parameters of the relevant requests (see the specific interface documentation for details).

* **What is sourceflag?** `sourceflag`  is a fixed string agreed upon in advance by both parties. For easier identification and management, it is recommended to use your **project name** (e.g., trustwallet, metamask).
* **How to obtain it?** Before integrating the project, please contact our technical support or business team to confirm this string.

### Important notice

{% hint style="info" %}
The request code examples in this document are using Axios
{% endhint %}

{% embed url="<https://www.npmjs.com/package/axios>" %}

### Contract Address

{% hint style="info" %}
StrideCross currently supports arbitrary token swaps on the following chains. Below are the contract addresses for each chain:
{% endhint %}

1. btc mainnet contract address：bc1q0fycgp9sta5a2m9weh4y4nc8u257l33p5tzykc
2. bsc mainnet contract address：0x04d6f7027ae7ce52654aa21bfb67802f0c9ea303
3. eth mainnet contract address：0x04d6f7027ae7ce52654aa21bfb67802f0c9ea303
4. polygon mainnet contract address：0x04d6f7027ae7ce52654aa21bfb67802f0c9ea303
5. arbitrum mainnet contract address：0x04d6f7027ae7ce52654aa21bfb67802f0c9ea303
6. avalanche mainnet contract address：0x04d6f7027ae7ce52654aa21bfb67802f0c9ea303
7. optimism mainnet contract address：0x04d6f7027ae7ce52654aa21bfb67802f0c9ea303
8. tron mainnet contract address：THrUA7FojKa8ypwJ77mQZUc23RADWeUVCx