I would like to play around with a little species creation. I have the Genisys game that offers some starting costs, and based on my math, it takes 230 XP to build a species for Star Wars. I am wondering what is the cost of various special abilities. I could probably do a little algebra to figure it out on my own, but if someone has already done the work, I would rather go with that.

Honestly the starting XP for the species in SWRPG are all over the place. My suggestion is to just use the Genesys maths (start with 3/2/2/2/2/1, 10+ Br/Will, one free skill and 100 starting XP) and go from there. Once you're done, compare it to a similar species and see if you need to adjust the starting XP by ±15 either way (which seems to be the variance, from what I can see).

Unfortunately, there is no one list of abilities that I am aware of to just grab from.

For Star Wars, the process for creating species from the beginning by the designers/writers has been to eyeball it, starting from a base human and tweaking it until it "looks right" to them. As c_beck noted, this has lead to things being all over the place and makes it pretty hard to come up with a reliable baseline for what things cost how much. Even Genesys has a considerable degree of flexibility in pricing species special qualities, relying on GM judgment.

Agreeing with the others that the species in this system are far less about hard maths and more about "the feel of it". Take their advice.

My two cents on things to consider with this...

• Follow the star wars tradition of Rule of Cool. Have your goal first, then design mechanics to justify it.
• When bumping stats away from the baseline human value of 2 ... be mindful that a step away is REMARKABLY different. Don't make the adjustment unless it's basically universal among the species.
• Also, these are broad species you're creating rather than individuals (that evil practice of generalizing mass populaces, YAY, do it.) - Why I bring this up is that you probably have a specific character from this species in mind ... you need to differentiate between the baseline of this new species and the average candidate. For example: Zeb is probably stronger than the common Lasat, so it's reasonable to infer that he put starter XP into that stat during creation beyond his species bonuses
• The other flavor quirks - some of them are honestly situationally garbage. I don't mean to bag on core designs, but if you have a twi'lek who never ends up on an arid planet that one goes to waste. I wouldn't put too heavy an emphasis on this department (my two cents)

Regarding eyeballing it goes, doesn't sound too different from how WEG did species creation.

Regarding the difference between individuals and their cultures, I have real world training and experience dealing with those kinds of issues and have no problem with applying them into game systems. I often even enjoy playing and writing characters that simultaneously play to and against type.