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How to get internal transactions using JSON-RPC methods

You need to use debug_traceTransaction. This method allows you to get all opcodes executed by the transaction, but if you need only the internal transactions it can be overkill. Luckily you can pass ...
0xSanson's user avatar
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How to detect if a transaction failed before Byzantium fork

You should check out Tenderly. It enables you to fork a specific chain and simulate transactions at a specific block. They have a free trial, which should be more than enough for your needs.
Nal Luksic's user avatar

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