What is the amount that must be placed in the fee

What is the amount that must be placed in the fee?
To solve the error:
While calling postTransaction (body), POST to //sdk-testnet.aepps.com/v2/transactions failed with 400: Invalid tx

Hey @emmy,

It would be great if you post your code where you creating a transaction. SDK itself calculate the fee amount if you don’t pass it manually.

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