Outlier connects companies wanting to develop or improve artificial intelligence tools with freelancers willing to test them for clarity and accuracy

Expected pay: $15 to $50 per hour (with significant caveats…see full review)

Husl$core: $$

Curion Insights is a market research firm that enlists consumers for product testing, focus groups and studies

Expected pay: $40 – $250 per hour

Husl$core: $$$$

JurisPro encourages individuals to list themselves on the site’s expert witness directory. But it charges a substantial annual fee to do so.

Expected pay: speculative

Husl$core: $$

Round Table Group enlists expert witnesses for legal consulting gigs

Expected pay: You set it

Husl$core: $$$$

Expert Institute is a legal services firm that recruits expert witnesses who can opine intelligently about everything from accounting to anesthesia to help lawyers in civil and criminal trials.

Expected pay: You set it

Husl$core: $$$$$

WinnWinn Research enlists individuals to participate in focus groups paying $25 – $300 per hour.

Expected pay: $25 – $300 an hour

Husl$core: $$$$$

Wynter enlists freelance experts to provide opinions about products and services they might buy

Expected pay: $5 to $600 per 5-minute to one-hour gig

Husl$core: $$$$

Rare Patient Voice seeks caregivers and patients to provide feedback on medical products, drugs, and other aspects of health care.

Expected pay: $120 per hour

Husl$core: $$$$$

UserInterviews connects companies looking for product research information with consumers willing to share their opinions for pay.

Expected pay: Varied, but significantly above minimum wage

Husl$core: $$$$

Respondent is a market research company that enlists individuals to answer highly specific questions for generous pay.

Expected pay: generous, but varies widely

Husl$core: $$$$$

SMA Inc. enlists engineers, project managers, designers and other professionals to provide on-demand work at professional rates of pay

Expected pay: varies

Husl$core: $$$$$

Robert Half connects workers with contract, temporary and permanent jobs in finance and accounting; tech; marketing & sales; health care; law; and administration. 

Expected pay: varies by position

Husl$core: $$$$$

Fiverr allows you to advertise your services for just about anything –write, edit, design logos, do voice-over work, provide digital marketing, animation, advice.

Expected pay: You set it

Husl$core: $$$$$

Maven links clients needing professional advice with independent experts who have relevant expertise.

Expected pay: You set it

Husl$core: $$$$

Zintro is a recruiting company that plays matchmaker between consultants and companies needing relevant expertise.

Expected pay: $100+ per hour

Husl$core: $$$$

Gerson Lehrman Group (GLG) is an international consulting firm that enlists freelancers to provide paid advice on a wide array of topics, from finance to marketing

Expected pay: you set it

Husl$core: $$$$

Catalant, formerly HourlyNerd, connects skilled freelancers with companies needing help with anything from logistics to marketing.

Expected pay: $100+ per hour

Husl$core: $$$$