Amazon - Mechanical Turk
Mechanical Turk allows creating microtask assingments on the web.
The most robust way of doing it is by using an external question and posting the tasks through the API.
<ExternalQuestion xmlns="http://mechanicalturk.amazonaws.com/..."> <ExternalURL>https://example.com/turk</ExternalURL> <FrameHeight>620</FrameHeight> </ExternalQuestion>
Price is the assingment reward and +20% for Amazon. When posting a task with 10 or more assignments, you have to pay 20% extra, but you can circle around that by creating multiple HITs with 9 assignments each. Only minus is that a single worker can do th same HIT multiple times, which might be an issue in some tasks.
Reward pricing depends on:
- wanted result quality, but you must then add qualifications
- assignment time, more time it takes, more you should be paying
- how fast you want the results, paying above the median award
US minimum rate: $7.25 / h Median turk in 2010 $1.38 / h High-end workers $8 - $14 / h