Insufficient Balance Error Explainer

WHAT IT DOES

Insufficient Balance Error Explainer takes a pending or recent transaction hash and determines whether it will fail due to a lack of funds. It reads the sender's native currency balance (ETH, MATIC, BNB, etc.) and, if the transaction interacts with an ERC-20 token, fetches that token's balance as well. It then computes the total required amount: the transaction value plus the full gas cost (gas limit × effective gas price). For token transfers, it compares the transfer amount against the sender's token balance. The tool also checks the transaction's nonce against the sender's pending nonce count to detect congestion that might cause out-of-order failures. The output includes a clear "will succeed" or "will fail" status, the exact balances, the required amounts, and the estimated balance after the transaction—all in plain language, so you know before you sign whether you have enough funds.

HOW TO USE

Paste any transaction hash (pending or already mined) into the input field, select the network, and click "Check balance". The tool connects to your wallet via the EVM bridge (read-only; it never signs or sends anything) to fetch the transaction details, the sender's current native and token balances, and the current gas price. If the transaction is still pending, it estimates the gas cost using the latest fee data. For token transfers, it automatically detects the token contract, fetches its symbol and decimals, and reads the sender's balance. The AI layer then generates a plain‑English summary: whether the transaction will revert, which balance is insufficient (native or token), the shortfall amount, and what the user would need to change. You can click on the transaction hash or addresses to view them on the block explorer for additional context.

PARALLEL BALANCE FETCH WITH NONCE CONGESTION DETECTION

Unlike simple balance checkers that only look at the current native balance, this tool performs a multi‑stage read in parallel across multiple RPC endpoints to minimize latency. It simultaneously fetches the transaction details, the sender's native balance, any token balance (if the calldata decodes to a transfer), and the pending nonce count. It then cross‑references the transaction's nonce with the number of pending transactions from that sender—if the nonce is higher than the pending count, it signals that earlier transactions may need to confirm first, which is a common hidden cause of "insufficient balance" errors that actually stem from nonce ordering. The tool also fetches historical gas prices from the last 10 blocks to compute a realistic gas cost estimate, using the 75th percentile to avoid under‑estimating in volatile conditions. If any RPC endpoint fails or times out, it falls back to the next without stopping the scan.

WHAT IT CANNOT SEE

This tool cannot detect balances that depend on off‑chain state (e.g., L2 cross‑chain messages not yet finalized, rebasing tokens that change balance between blocks, or balances in private mempools). It cannot predict future balance changes from other pending transactions that may execute before this one, potentially altering the available funds. It cannot verify that the sender intended to use the exact token or amount being checked—the tool reads what is on‑chain, not the user's intent. It cannot see balances in contracts that use non‑standard balance lookup patterns (e.g., ERC‑4626 vaults with dynamic shares) or tokens that implement balance hooks that alter the actual available amount (e.g., fee‑on‑transfer tokens). It cannot guarantee that a retry with adjusted gas or amount will succeed even if the balance appears sufficient, due to race conditions, front‑running, or state changes between the check and the transaction being mined.

PLEASE NOTE

This tool works only for EVM‑compatible chains (Ethereum, Polygon, BSC, Arbitrum, Optimism, Avalanche C‑chain, etc.). All explanations are AI‑generated from data the app reads on‑chain—the AI synthesizes the balances, gas costs, and transaction details into plain English, but it does not have special access to private contract logic or off‑chain data. Always review what you are actually signing in your wallet before approving any transaction; a balance explanation does not replace your own verification of the transaction details. This tool is provided free of charge, with no warranty of accuracy or completeness.