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This question already has an answer here:

I understand that some operations require a minimal fee, for instance ꜩ0.001271 for transfer operations. Besides, some operations require to burn extra tez. Are these fees documented somewhere?

marked as duplicate by Ezy, zixuan, Tom, Pikachu the Parenthesis Wizard, Henry WH Hack v2.1.3 Feb 15 at 3:34

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Docs in tezos.git

Docs by TezTech

To copy from the tezos.git docs:

fees >= (minimal_fees + minimal_nanotez_per_byte * size
                      + minimal_nanotez_per_gas_unit * gas)

(size is the size of the operation in binary.)

With current defaults:

minimal_fees = 0.000 1 ꜩ (100 µꜩ)
minimal_nanotez_per_gas_unit = 100 nꜩ/gu (0.000 000 1 ꜩ/gu)
minimal_nanotez_per_byte = 1000 nꜩ/B (0.000 001 ꜩ/B)

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