Alaska has a variable annual payout, and while $1,900 a year is better than $0 a year, it has not led to economic/artistic/scientific revolutions described by basic income proponents.
Initially? Probably not for those in developed countries.
The median per-capita household income (per http://www.gallup.com/poll/166211/worldwide-median-household..., as of 2013) is about $3k/yr. For half the people on the planet, $100/yr would make an appreciable difference in their purchasing power (more than 1/3 their monthly income).
Is that a practical amount? $100/yr for every person on the planet is less than 5% of the GDP of the US, and less than 1% of the global GDP (GWP). If the US was going to foot the bill alone (it shouldn't), it would be about a quarter of our tax revenues. Steep, but doesn't sound financially impossible (political and infrastructural issues may well be another matter).