Transaction Fees

A transaction fee is a fee that is required in order to process a transaction on the Beo network. Below, we describe the way in which Deploy and Execute transactions are priced. At the time of writing, puzzle solutions are free.

Beo Credits Denomination Table​

Denomination	Size of Transaction	Value	Example
microcredit	Byte	1	Smallest denomination
millicredit	Kilobyte (KB)	1000 microcredits	Most transactions average between 3 and 10 millicredits
credit	Megabyte (MB)	1000 millicredits	Largest denomination

Types of Transaction Fees​

Deployment Base Fee​

This is what you pay for deploying a program to the Beo network. Deployment fees consist of the following parts:

• There is a size cost, determined by the amount of raw bytes of your program.

• There is a namespace cost, the smaller your program name the more you pay. There is no namespace cost if your program name is 10 characters or longer.

• There is a synthesize cost to process your program. The more complicated operations which your program has, the more time it takes for the network to convert this to a circuit to create zero knowledge proofs for.

Execution Base Fee​

This is what you pay for executing program functions on the Beo network.

• There is a size cost, determined by the amount of raw bytes of your program. A quadratic fee kicks in above 5 KB.

• There is a finalize cost, determined by the amount of operations in your function's finalize scope.

• There is no execution cost, because verifying the associated zero knowledge proof is cheap.

Priority Fee​

Priority fees are optional fees which can help speed up the processing of your transaction during high traffic. They are not yet supported, but will soon be.

Estimating fees​

The fee determination logic is defined in a file called cost.rs. If you want to quickly estimate fees using a website, provable.tools has some limited support. Or you can also use leo cli to estimate the fees for your transaction. Example as below:

First, generate a example program using leo example.

leo example lottery
cd lottery

Then use leo deploy to estimate the deployment fees for your transaction.

leo deploy --network testnet --endpoint "https://api.explorer.provable.com/v1" --path .

Or use leo run to estimate the execution fees for your transaction.

leo execute play --program lottery_test.Beo --endpoint https://api.explorer.provable.com/v1 --dry-run --broadcast

This method works without needing to fund the private key in .env and it will look something like this:

Base execution cost for 'lottery_test' is 0.041048 credits.

+---------------------+----------------+
| lottery_test        | Cost (credits) |
+---------------------+----------------+
| Transaction Storage | 0.001338       |
+---------------------+----------------+
| On-chain Execution  | 0.039710       |
+---------------------+----------------+
| Priority Fee        | 0.000000       |
+---------------------+----------------+
| Total               | 0.041048       |
+---------------------+----------------+

Your current public balance is 7.401737 credits.

✅ Successful dry run execution for 'lottery_test.Beo'