> For the complete documentation index, see [llms.txt](https://docs.hope.money/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hope.money/appendix/faq/hopeswap-approve-usdt-error.md).
# HopeSwap Approve USDT Error
## HopeSwap Approve USDT Error
When users operate on HopeSwap, the following exceptions may occur when they need to approve USDT.
Error
## Error Cause
The problems mainly occur in the situation of insufficient authorization of USDT, so it is best to use the method of full authorization in the use of authorization.
The USDT approval operation mandates that the initial authorization amount should be set to 0. Any non-zero authorization that continues will result in an error being reported by the contract.
## Solutions
**(1) Revoke your USDT Approve in HopeSwap (Recommended)**
1. Enter the [USDT Write Contract](https://etherscan.io/address/0xdac17f958d2ee523a2206206994597c13d831ec7#writeContract).
2. Connect your Wallet.
3. Choose the "approve" method.
4. "*spender" fill in HopeSwap Router address:* `0x219Bd2d1449F3813c01204EE455D11B41D5051e9`\
"\_value" fill in 0
**(2) Using up the remaining amount of USDT**
1. Enter the [USDT browser](https://etherscan.io/address/0xdac17f958d2ee523a2206206994597c13d831ec7#readContract).
2. Choose the "allowance" method.
3. "\_onwer" fill in your own address;\
"\_spender" fill in HopeSwap Router address: `0x219Bd2d1449F3813c01204EE455D11B41D5051e9`
{% hint style="info" %}
Example: The queried 18357027, and the actual remaining amount is 18.357027 USDT since the data has six decimal places.
{% endhint %}
4. Use up the rest balance of the last authorized and re-authorize USDT in HopeSwap.
**(3) Use a new wallet address in HopeSwap.**
## How to avoid this problem
You are suggested to use the "***Default Value***" when setting the approval amount for USDT to avoid future approval failures.
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.
Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:
```
GET https://docs.hope.money/appendix/faq/hopeswap-approve-usdt-error.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.
