Developer builds crypto wrong-send tool after finding Nansen label quirk saves 99 credits

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A developer created a free tool called Sent Wrong to help users determine whether cryptocurrency sent to a wrong address is recoverable. The tool uses Nansen's API to classify addresses and guide users toward the correct next step, such as filing a Binance support ticket or accepting an irreversible loss. During development, the creator discovered that Nansen's cheap profiler endpoints returned wealth tags like 'Token Billionaire' rather than useful exchange entity labels, making them unreliable for the tool's core purpose. The accurate entity label was found instead inside a transaction-lookup endpoint costing just 1 credit, compared to the 100-credit profiler alternative. This finding reshaped the tool's logic from directly querying address identity to strategically selecting transactions most likely to reveal the address's true owner.

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