I have an offer for a 3 letter .io domain. Recently, Google added .io extension as GccTld. How much is the best price to pay for this 3 letter .io extension domain? My client is looking to get it for a brandable/SaaS web company. How to know if it's the right price I'm paying? Does this .io impact SEO or SERP results?
No SEO benefit. .io is treated the same as .com, .net, .org, etc. As for value? Whatever the buyer is willing to pay. What it's worth to them as a business, as a brand for them (vs what else is available). In my view though, if 1) the .com is taken, 2) this isn't a "hack domain",and 3) word of mouth and type-ins are important, come up with a .com brand name. If they aren't important (i.e. search and referrals are the sources of traffic), then a .io is fine.