When fetching or creating transactions, the amount, fees and max_fees values are always expressed in the lowest available unit, also known as the base unit: satoshi for Bitcoin, wei for Ethereum, mutez for Tezos, etc. You can inspect the units available via a call to GET /accounts/<id>/currency.

ℹ️ Token transfer transactions on Ethereum, Polygon, or other EVM networks: the amount value is expressed in the ERC-20 base unit, but the fees and max_fees values are expressed in the network currency used to pay for the transaction fee (ETH for Ethereum, MATIC for Polygon, etc,).

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