A potbelly sandwich and a bag of chips. I get rather substantially more monetary consideration from Chase Bank as a consequence of my relationship with Twilio than I do from Twilio. (I spend +/- $7k per year on Twilio, so 1% CC rewards is $70 cash money. Chase clearly has me on the take!)
Seriously, though: I've never taken money for promotion from anybody. That's not my business model, which is straightforward: mostly, I sell software to businesses for money. It's not terribly difficult to get me to write or speak for free, since I love writing and speaking about geeky subjects, as evidenced by about 2 million words on my blog or HN comments.
Based on my much less intense use of Twilio, they wouldn't have to pay me a cent to get me to write a glowing article like this. They're really good, their documentation is very useful and crystal clear, all I needed to get my code working, and their system just plain works.