A __micropayment__ is a financial transaction involving a very small sum of money and usually one that occurs online. A number of micropayment systems were proposed and developed in the mid-to-late 1990s, all of which were ultimately unsuccessful. A second generation of micropayment systems emerged in the 2010s- wikipedia 
For a more recent take on micropayments take a look at: - History of micropayments - Web Monetization API
In the federation, we are particularly interested in looking at micropayments for federated microservices that would be used by knowledge communities to steward, protect and develop a knowledge commons.
While micropayments were originally envisioned to involve very small sums of money, practical systems to allow transactions of less than $1 have seen little success. One problem that has prevented the emergence of micropayment systems is a need to keep costs for individual transactions low, which is impractical when transacting such small sums even if the transaction fee is just a few cents.
# Online gaming
The term micropayment or microtransaction is sometimes attributed to the sale of virtual goods in online games, most commonly involving an in-game currency or service bought with real world money and only available within the online game- wikipedia
# Recent systems
# Obsolete systems
# Sections