How much does it cost to make a trading bot?

Can you give me an idea of how much it might cost to develop a trading bot for cryptocurrency? Are there any standard prices, or does the cost vary depending on the complexity and features of the bot? I'm curious to know if there are any hidden costs or ongoing expenses I should be aware of before investing in one. Is it more cost-effective to build a bot from scratch or use an existing platform or service? I'm eager to learn more about the financial considerations involved in creating a trading bot.