Growth in U.S. subscribers slows, though international users surge. CEO Reed Hastings says Netflix doesn’t plan any further price hikes again anytime soon.

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SAN FRANCISCO — Net­flix is testing the financial limits of its streaming video service as the rising cost of producing original programming pushes up subscription prices.

The latest reminder came Monday with its third-quarter earnings report, revealing Netflix had added 370,000 U.S. subscribers. That marks its second consecutive quarter of slowing U.S. growth since lifting a two-year rate freeze and increasing prices by as much as 20 percent for more than 20 million existing subscribers.

While the latest quarterly subscriber gain exceeded management’s modest projections, it fell far below the 880,000 U.S. customers that Netflix picked up at the same time last year. The deceleration occurred even though the latest period included the July debut of “Stranger Things,” one of the summer’s surprise hits.

Netflix is now faring far better overseas as it tries to diversify its video library to suit the tastes of 189 other countries. The company added 3.2 million international subscribers in the third quarter, surpassing the 2.7 million it gained at the same time last year when it was operating in about 130 fewer countries.

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Investors were thrilled with the international progress and the better-than-expected showing in the U.S. Netflix’s stock surged nearly 20 percent to $119.91 in extended trading.

The drop-off in U.S. subscriber gains underscores the delicate balancing of trying to attract customers while financing its ambitious expansion overseas amid fierce competition from Amazon and HBO.

It’s an expensive challenge, which is why Netflix raised the price for its most popular U.S. plan from $8 to $10 per month. And the pressure to continue increasing rates every few years is likely to continue, though Netflix CEO Reed Hastings said Monday that there are no plans to raise prices again anytime soon.

On average, Netflix said, it is collecting 10 percent more for its subscribers worldwide than a year ago. About 25 percent of the U.S. subscribers still covered by the rate freeze imposed in 2014 will have their prices raised by year’s end.

After spending $5 billion on original programing and licensing rights to other shows this year, Netflix has earmarked $6 billion for next year. Only Walt Disney Co. and NBC are spending more on programming, according to the research firm IHS Markit. Netflix expects to offer 1,000 hours of original shows and movies next year, up from 600 hours this year.

But the price increases that help finance new shows threaten to become counterproductive if they drive away too many of the existing 47.5 million U.S. subscribers or discourage potential new customers.

Netflix does not disclose how many of its subscribers cancel each quarter, but Wedbush Securities analyst Michael Pachter estimates about 1 million U.S. households opened new accounts from July through September. That means about 600,000 subscribers abandoned the service during the third quarter, if Pachter’s calculations are accurate.

Even at $10 per month, RBS analyst Mark Mahaney contends Netflix remains a bargain for the average U.S. subscriber, who watches about 60 hours of programming each month, more time spent than viewing other popular cable-TV channels. By Mahaney’s calculations, the average U.S. Netflix subscriber is paying the equivalent of 17 cents per hour of programming watched versus a range of 25 to 38 cents per hour for every hour of programming watching on AMC, FX, CNN, CBS, Comedy Central and Nickelodeon.

For that reason, Mahaney believes Netflix will still be able to raise its monthly prices by a few more dollars during the next four years and still reach 160 million worldwide subscribers in 2020. Netflix ended September with nearly 87 million worldwide customers.

For now, Netflix is leaning on its U.S. streaming and DVD-by-mail business to subsidize unprofitable overseas operations. It is promising to make money internationally next year. Overall, Netflix’s third-quarter earnings nearly doubled from a year earlier to $51.5 million, or 12 cents per share.

Netflix had hoped to expand into China on its own, but said Monday it will instead license some of its content to other providers that already have cleared that country’s regulatory hurdles governing the kind of video that can be shown.