How much does it cost to deploy and execute a smart contract?

Smart contract deployment costs vary significantly based on network congestion and complexity. On Ethereum, costs range from $50 to $500+ during peak times, measured in 'gas fees.' Each operation (deploying, executing functions) requires gas—priced in Gwei (billionths of ETH). For example, a simple contract might cost 50,000 gas units; at 50 Gwei per unit, that's 0.0025 ETH (~$5-75 depending on ETH price). Layer 2 solutions like Polygon or Arbitrum reduce costs to cents. Execution fees depend on contract complexity and network demand. Simpler interactions cost less; complex calculations cost more. Always check current gas prices before deploying to minimize expenses.