When Sam Walton founded Walmart in 1962, he used a combination of low prices, tight margins, and scale to undercut the competition and grow it into the No. 1 company on the Fortune 500.

The Bentonville, Arkansas retailer is using a similar strategy—at least in terms of undercutting price—to grow Walmart+, which launched on September 15, into an e-commerce titan.

For $98 per year, Walmart+ subscribers will get free unlimited delivery as well as discounts at its gas stations. That compares to the $119 annual price tag of Amazon Prime.

So can Walmart+ actually threaten Amazon Prime? To find out, Fortune and SurveyMonkey polled 2,717 U.S. adults on their likelihood to use the service.*

Our polling data suggest a strong Walmart+ launch: Among U.S. adults, 27% say they're likely to subscribe. That could translate to tens of millions of signups.

And Amazon Prime could lose members in droves to Walmart+. Amazon Prime members (31%) are more likely than non-Prime members (19%) to say they'll sign up for Walmart+.

Among Amazon Prime members, 40% of those earning under $50,000 say they'd likely sign up for Walmart+. That group might be unlikely to pay for two subscriptions, and could drop Prime altogether. That'd end up a massive blow to Prime's 112 million U.S. membership base.

Walmart has spent billions to boost its e-commerce business: Just look at its $3.3 billion purchase of Jet.com in 2016. And it's likely to convert a lot of those online shoppers into subscribers: Among Walmart.com shoppers, 41% say they're likely to subscribe to Walmart+.

But it's frequent in-store Walmart shoppers who are the most likely to say they'll sign up for Walmart+. Among weekly in-store Walmart shoppers, 43% are likely to get Walmart+. 32% of monthly shoppers say the same.

With such a huge chunk of in-store shoppers likely to subscribe, it does beg the question: Would Walmart+'s growth undercut the company's in-store sales and traffic? Amazon Prime, which didn't evolve from a brick-and-mortar operation, isn't comparable here.

Whatever's in store, Walmart+ is likely to build a massive membership base and a recurring revenue stream that will make shareholders happy. It's set up for early success.

*Methodology: The Fortune-SurveyMonkey poll was conducted among a national sample of 2,717 adults in the U.S. between July 13-14. This survey’s modeled error estimate is plus or minus 3 percentage points. The findings have been weighted for age, race, sex, education, and geography.