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Debug an EVM Transaction That Reverted or Failed to Estimate Gas

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On-chain & DeFi intermediate 8 min read $0.01 Updated 2026-10-19

Finding why an EVM transaction reverts: reading status and revert data, decoding custom errors, eth_call replay at a block, trace tools, common causes (allowance, balance, slippage, deadline, paused, access control) and out-of-gas vs revert.

A transaction reverts, or the wallet says "gas estimation failed" or "execution reverted". Decode the revert reason, replay the call at the failing block, and check allowance, balance, slippage, deadline and state.

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