Troubleshooting Common Crypto Transaction Errors

Navigating decentralized exchanges and liquidity pools can be empowering, but it often comes with technical hurdles. Whether you're swapping tokens, adding liquidity, or staking in yield pools, encountering errors is common—especially for newcomers. This guide walks you through the most frequent issues users face when interacting with decentralized finance (DeFi) protocols, offering clear solutions to get your transactions back on track.

Understanding these errors not only saves time but also protects your assets from failed transactions and unnecessary gas fees. Below, we break down each error type, explain its root cause, and provide step-by-step fixes.

Common Exchange-Related Errors

INSUFFICIENT_OUTPUT_AMOUNT

The transaction cannot succeed due to error: BabyDogeRouter: INSUFFICIENT_OUTPUT_AMOUNT.

This error typically appears during token swaps when the expected output amount falls below the minimum threshold set by your slippage tolerance—or when liquidity for the trading pair is too low.

How to fix it:

• Refresh the page and retry the swap later.
• Try trading a smaller amount at once.

• Increase your slippage tolerance:

  1. Tap the settings icon on the swap interface.
  2. Adjust slippage slightly upward (e.g., from 1% to 3–5%) and attempt the swap again.
• Enter an amount with fewer decimal places to avoid precision issues.

👉 Maximize your swap success rate with optimized settings and real-time data tools.

INSUFFICIENT_A_AMOUNT or INSUFFICIENT_B_AMOUNT

Fail with error 'BabyDogeRouter: INSUFFICIENT_A_AMOUNT' or 'INSUFFICIENT_B_AMOUNT'

This occurs when adding or removing liquidity from a pool where one of the two tokens has insufficient balance in the pair due to extreme price movements or low reserves.

Solutions:

• Refresh the page and try again after a short delay.

• If the issue persists:

  1. Open the settings menu on the liquidity page.
  2. Slightly increase your slippage tolerance.
  3. Reattempt the action.

Low liquidity pools are more prone to this—consider using larger, more established pairs for smoother interactions.

BabyDogeRouter: EXPIRED

The transaction cannot succeed due to error: BabyDogeRouter: EXPIRED.

This means the transaction deadline passed before you confirmed it. Most DeFi platforms set a default timeout (often 20–30 minutes), and if you don’t sign within that window, the transaction fails.

Fix:

• Generate the transaction again.
• Confirm (sign and broadcast) immediately after initiation.

Delays caused by multitasking or slow wallet responses often trigger this error—stay focused during critical steps.

BabyDoge: K

The transaction cannot succeed due to error: BabyDoge: K.

This usually happens when swapping tokens that charge a transfer fee—such as rebasing tokens like tDoge or tBTC—and the system miscalculates outputs due to dynamic supply changes.

Workaround:

• Swap direction matters. Try modifying the amount in the “To” field instead of “From.”
• This forces the “From” field to become an estimate, which can accommodate fee adjustments.
• Initiate the swap right away after setting the values.

BabyDoge: TRANSFER_FAILED

Execution reverted: BabyDoge: TRANSFER_FAILED

Tokens with restorative rebase mechanisms often require extra buffer because their balances adjust automatically. To ensure success:

• Hold at least 30% more of the token than you plan to trade.
• When selling all holdings, use 70% or 69% instead of 100% to avoid hitting balance limits.

Additionally, some malicious tokens restrict trading:

• Trading may be paused by the issuer.
• Only whitelisted wallets can sell.
• Airdropped tokens showing this error are often scams.

⚠️ Never approve unknown contracts if you suspect fraud. Always research tokenomics and issuer credibility before interacting.

Price Impact Too High / Transaction Cannot Succeed

Both errors point to low liquidity in the trading pair.

What it means: Large trades in shallow pools cause significant price shifts, making execution risky.

Solutions:

• Reduce trade size.
• Increase slippage tolerance via the settings gear.
• Wait for higher liquidity periods or consider alternative trading routes.

estimateGas Failed

This transaction would fail. Please contact support.

This critical error indicates a problem with the token’s smart contract logic—not your setup.

If removing liquidity from a BNB pair:

• Select “Receive WBNB” instead of BNB and retry.

For token swaps:

• The issue lies with the token project itself.
• Contact the development team—they must resolve contract-level bugs.

Cannot Read Property 'toHexString' of Undefined

Unknown error: "Cannot read property 'toHexString' of undefined"

Frequently reported on Trust Wallet (mobile) during swaps.

Steps to resolve:

1. Retry with increased slippage.
2. If unresolved, switch to another wallet like SafePal or MetaMask Mobile.

Wallet-specific bugs can interfere with transaction encoding—using alternatives often bypasses these issues.

Execution Reverted: TransferHelper: TRANSFER_FROM_FAILED

TransferHelper: TRANSFER_FROM_FAILED

This means the contract couldn’t pull your tokens because:

• You don’t have enough balance.
• You haven’t granted sufficient spending allowance.

Fix:

1. Verify wallet balance.
2. Approve the token again with adequate allowance via the DApp interface.

Failure here halts all interactions—double-check approvals before proceeding.

Liquidity Pool & Staking Issues

Out of Gas Error

Warning! Error encountered during contract execution [out of gas]

You’ve set a gas limit too low for the operation to complete.

Solution:

• Manually increase the gas limit (not gas price) in your wallet.
• Use 200,000 units as a starting point for staking/unstaking.
• Refer to your wallet’s guide (e.g., MetaMask) for adjusting advanced settings.

👉 Access advanced transaction controls and avoid failed executions.

BEP20: Transfer Amount Exceeds Allowance

Fail with error 'BEP20: transfer amount exceeds allowance'

Your approved spending limit for a contract is lower than the amount you're trying to use.

How to fix:

1. Visit Unrekt.net (external tool).
2. Revoke current approval for the contract.
3. Re-approve with no spending cap or a higher limit.
4. Retry the interaction.

Old or partial approvals often cause this—clean them regularly for security and functionality.

BEP20: Transfer Amount Exceeds Balance

Fail with error 'BEP20: transfer amount exceeds balance'

Common when unstaking from BabyDoge reward pools with depleted rewards.

If unstaking:

• Notify the team so they can refill rewards.

• Or use emergencyWithdraw to retrieve principal without pending yield:

  1. Find the pool’s contract address (check transaction history).
  2. Go to BscScan > Contract > Write Contract.
  3. Connect Web3 and locate emergencyWithdraw.
  4. Enter "0" and click “Write.”

⚠️ This forfeits unharvested rewards—use only in urgent cases.

General Platform & Connection Errors

Provider Error – No Provider Found

Provider Error: No provider was found

You’re trying to connect via browser extension (e.g., MetaMask), but it’s not installed or disabled.

Solution: Install and enable your Web3 wallet extension before connecting.

Unsupported Chain ID

Switch your network to Binance Smart Chain (BSC). Most DeFi platforms on BSC require Chain ID 56.

Check wallet documentation for network configuration steps if unsure.

Buying Tokens With Fees

Tokens that charge transfer fees (like tDoge) require adjusted slippage:

• Click the settings icon.
• Set slippage tolerance equal to or higher than the token’s fee percentage (e.g., 10% for a 10% fee).

Otherwise, you’ll receive less output than expected—and trades may fail.

Internal JSON-RPC Errors

Examples:

"insufficient funds for transfer"
"transaction underpriced"

These stem from network-level issues:

• Insufficient BNB: You need BNB in your wallet to pay gas fees on BSC.
• Underpriced transaction: Gas price too low; increase it manually.
• Unknown RPC failures: Try switching wallets (e.g., from MetaMask to Trust Wallet).

Clear browser cache or app data if problems persist.

Error: [ethjs-query] Formatting Outputs from RPC

{"code":-32603,"message":"handle request error"}

Causes vary but often relate to node connectivity or corrupted requests.

Try this checklist:

1. Increase gas limit
2. Raise slippage tolerance
3. Clear browser or app cache
4. Restart wallet connection

Sometimes, simply retrying after a few minutes resolves transient backend issues.

Frequently Asked Questions (FAQ)

Q: Why do I keep getting slippage-related errors?
A: High volatility or low liquidity causes large price swings. Increasing slippage tolerance helps trades go through—but stay within safe limits (usually under 12%).

Q: How do I know if a token is malicious?
A: Check if selling is restricted, if it came from an unverified airdrop, or if community reports flag it. Use tools like BscScan and TokenSniffer to analyze contract risks.

Q: What does ‘emergencyWithdraw’ do?
A: It lets you unstake immediately but forfeits any unclaimed rewards. Use only when necessary.

Q: Can I recover funds after a failed transaction?
A: Yes—failed transactions refund your tokens, but gas fees are non-refundable. Avoid repeated retries to save costs.

Q: Why does my wallet show enough balance but still fail?
A: Some tokens have dynamic balances due to rebasing, or pending transactions lock funds. Wait for confirmation or reduce trade size.

Q: Is it safe to increase slippage?
A: For known, legitimate tokens—yes. But high slippage on obscure tokens increases risk of sandwich attacks. Always verify token legitimacy first.

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