In general, the price of a keyword is 300-400 yuan/month, and they need to be optimized before charging.
But more than 90% of third-party companies charge first, and it is a one-year fee. From 6,800 to 20,000. But after receiving the money, I'm not sure if they will do it. So this way, for enterprises, there is no way to control the effect.
It is more reasonable to rank first and then deduct the fee after reaching the standard.
I'm Mr. Jia Zhen, and I'm not an expert in search engine optimization or a marketing expert. I only share marketing experience that is really useful and grounded.
I hope my answer can help you, and I hope it will be adopted!
good luck