Fetch.ai charges developers for computation and storage of data on the Fetch.ai Ledger in a manner which incentivises good coding practices.
With the best use of Fetch.ai Ledger types such as
ShardedState, you can limit the fees by distributing data storage over a minimum number of shards.
Fees rise in a linear manner per number of shards up to the maximum number of shards.
The following information details the current implementation which is likely to change.
Calculating charge units
Storing data on the Fetch network costs 2 units per byte.
Performing computation on the Fetch network costs 1 unit per operation.
TOTAL_UNITS = ((2*storage) + computation) * number of shards
You can find out the total size of
etch variables here.
Calculating total transaction fee
To calculate the transaction fee, multiply the total units by the charge rate given in FET or denominations thereof.
TOTAL_FEE = TOTAL_UNITS * CHARGE_RATE
The Fetch.ai Ledger uses the charge rate to prioritise the order of the incoming transactions in the same way as the Ethereum and Bitcoin networks do with gas and transaction fees respectively.