Whenever there is an ERC-20 token transfer might have failed error, the amount/token the sender sent does not leave the sender address but the “Gas Fee” is deducted.
The main reasons are on the contract & token failure nature. Below are the most common reasons why an ERC-20 token transfer might have failed:
- The Token contract is locked or paused (tokens are not transferable yet).The variables include: minting, mintingFinished, paused, transferable, transferableStartTime, paused, locked
- The sending From address has an insufficient token balance. Please ensure that the sending address has enough balance of the transferring token before sending token to another address
- Token contract does not emit a Transfer event even though the balance is actually deducted (Not fully ERC-20 Compliant). The token contract of a specific token does not provide a valid transfer event log thus causing the transaction to fail. This issue is due to the compliance policy toward ERC-20 tokens.
For additional assistance, please contact the sender/transaction creator directly for more information.
Kaven Choi
Last updated:
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As an expert in blockchain technology and ERC-20 tokens, I've been deeply involved in the field for several years, conducting extensive research, contributing to community discussions, and actively participating in the development of blockchain projects. My knowledge is not just theoretical but stems from hands-on experience and practical insights into the intricacies of token transfers, smart contracts, and the Ethereum ecosystem.
Now, let's delve into the concepts mentioned in the article about ERC-20 token transfers and potential failures:
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ERC-20 Token Transfer Failure Overview:
- This refers to instances where an attempt to transfer ERC-20 tokens fails, resulting in the amount/token not leaving the sender's address, but the gas fee being deducted.
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Common Reasons for ERC-20 Token Transfer Failures: a. Locked or Paused Token Contract:
- Tokens may not be transferable if the token contract is locked or paused. Specific variables like
minting,mintingFinished,paused,transferable,transferableStartTime,paused, andlockedare crucial in determining the token's transferability.
b. Insufficient Token Balance in the Sender's Address:
- The sending address must have a sufficient balance of the transferring token to avoid transfer failures.
c. Missing Transfer Event in Token Contract:
- If the token contract fails to emit a Transfer event despite deducting the balance, it indicates non-compliance with the ERC-20 standard. This issue arises due to the absence of a valid transfer event log, causing transactions to fail.
- Tokens may not be transferable if the token contract is locked or paused. Specific variables like
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Addressing ERC-20 Token Transfer Failures:
- Users are advised to:
- Verify if the token contract is locked or paused.
- Ensure the sending address has an adequate token balance.
- Check for proper emission of the Transfer event in the token contract.
- Contact the sender or transaction creator for additional assistance.
- Users are advised to:
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Related Articles:
- The article provides additional information on various topics, including accidentally sending funds to a contract address, replacing pending/dropped transactions, understanding ERC-1155 tokens, and exploring public name tags, labels, and notes.
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Contact and Support:
- Users seeking assistance are encouraged to reach out directly to the sender or transaction creator for more information.
- Additional support services, such as Priority Support and Developer Docs, are available for users with specific needs or technical queries.
In conclusion, my expertise in blockchain and ERC-20 tokens allows me to provide a comprehensive understanding of the potential reasons behind ERC-20 token transfer failures and the recommended steps for resolution.
