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Calculate Account Creation Cost

This example demonstrates how to calculate the minimum balance required for rent exemption for a Solana account.

Code

#!/usr/bin/env python3
"""
Solana Cookbook - How to Calculate Account Creation Cost
"""

import asyncio
from solana.rpc.async_api import AsyncClient

async def main():
    rpc = AsyncClient("https://api.devnet.solana.com")

    space = 1500  # bytes

    async with rpc:
        lamports = await rpc.get_minimum_balance_for_rent_exemption(space)
        print(f"Minimum balance for rent exemption: {lamports.value}")
        print(f"For account size: {space} bytes")
        print(f"Cost in SOL: {lamports.value / 1_000_000_000}")

if __name__ == "__main__":
    asyncio.run(main())

Explanation

  1. Set account size: Define the account size in bytes (1500 bytes in this example)
  2. Get minimum balance: Use get_minimum_balance_for_rent_exemption() to calculate the required lamports
  3. Display results: Show the cost in lamports and convert to SOL for easier understanding

Key Concepts

  • Rent exemption: Accounts with sufficient balance are exempt from rent payments
  • Lamports: The smallest unit of SOL (1 SOL = 1,000,000,000 lamports)
  • Account size: Determines the minimum balance required for rent exemption

Usage

python calculate_account_creation_cost.py

This will output something like: 

Minimum balance for rent exemption: 10616160
For account size: 1500 bytes
Cost in SOL: 0.01061616