For a short period of time, Iran and Mongolia had universal basic income. Currently, no countries in the world have universal basic income. You can read about the Universal Basic Income (UBI) – Necessity, Benefits, Guiding Principle, Pros & Cons in the given link.
Regarding Universal Basic Income, there have been few large scale experiments and few small scale pilot projects through various targeted schemes. The Indian Government implemented Mahatma Gandhi National Rural Employment Guarantee Act (MGNREGA) which is a variant of traditional guaranteed minimum income program.
- Difference between Minimum Income Guarantee (MIG) and Universal Basic Income (UBI)
- MGNREGA (Mahatma Gandhi National Rural Employment Guarantee Act) – Facts, Objectives, Roles of State Govt, Gram Sabhas, Panchayats