In the past few years, art made by programs like Midjourney and OpenAI's DALL-E has gotten surprisingly compelling. These programs can translate a text prompt into literally (and controversially) award-winning art. As the tools get more sophisticated, those prompts have become a craft in their own right. And as with any other craft, some creators have started putting them up for sale. PromptBase is at the center of the new trade in prompts for generating specific imagery from image generators, a kind of meta-art market. Launched earlier this summer to both intrigue and criticism, the platform lets "prompt engineers" sell text descriptions that reliably produce a certain art style or subject on a specific AI platform.