Chime

Sierra

Chime

Chime makes money almost entirely from interchange fees. Every time a Chime member uses their debit card, the merchant pays a swipe fee (typically 1-2% of the transaction).

Chime keeps a portion of that interchange. The model only works at scale — Chime needs millions of members making thousands of transactions to generate meaningful revenue.

But with 22 million members, the math works. Chime also earns interest on member deposits and fees from optional instant transfer services.

Sierra

Companies pay Sierra to run their customer service with AI agents instead of hiring rooms full of humans. The agent talks to your customers over chat.

It answers questions. It processes returns.

It updates subscriptions. Here is the clever part.

Sierra charges based on outcomes, not seats. Brands pay when the AI actually resolves a problem, not just for having the software installed.

That pricing is unusual. Most software charges a flat monthly fee no matter what.

Sierra only gets paid when the bot does the job.

Chime

Chris Britt spent years working in financial services — at Visa, Green Dot, and other companies — and kept seeing the same thing: banks made a disproportionate amount of their revenue from fees charged to their least wealthy customers. Overdraft fees alone generated $35 billion annually for US banks.

The average overdraft was $36 for a $24 transaction — that's a 150% fee. Poor people were subsidizing free checking for rich people.

In 2012, Britt co-founded Chime with Ryan King (CTO) to build a bank account designed for people living paycheck to paycheck. The core promise was radical: no monthly fees, no minimum balance, no overdraft fees, ever.

You'd get your direct deposit up to two days early (because Chime could release funds as soon as they were notified of a pending deposit, while banks sat on the money for two extra days), and you could overdraft up to $200 without any penalty through a feature called SpotMe.

The product launched in 2014 and grew slowly at first. But the target market — working-class Americans frustrated with bank fees — was enormous.

Once people tried Chime and realized they'd never see another $35 overdraft fee, they told everyone they knew.

Sierra

Bret Taylor had already done the impossible twice. He co-created Google Maps.

He later became co-CEO of Salesforce, chaired Twitter's board during the messy Elon Musk takeover, and became chairman of OpenAI in late 2023. Clay Bavor spent 18 years at Google, most recently running its Labs group.

The two friends left their big jobs in 2023 to build something together. They picked customer service on purpose.

It is the least glamorous corner of software. Their logic was simple.

Companies hate their support costs. Customers hate waiting on hold.

AI that actually resolves problems could fix both sides at once. They launched Sierra in February 2024 with $110 million from Sequoia and Benchmark.

Chime

Chime grew through massive direct-to-consumer advertising. TV commercials, YouTube ads, podcast sponsorships, Instagram campaigns — all hammering the same message: no fees, get paid early, no overdraft penalties.

The message resonated with a demographic that traditional banks ignored or exploited: working-class Americans earning $30,000-$75,000 per year.

The "get paid early" feature was the killer hook. Chime releases direct deposits up to two days before payday.

For someone living paycheck to paycheck, getting paid on Wednesday instead of Friday is life-changing. It reduced the need for payday loans and covered emergency expenses.

The feature spread through word of mouth faster than any ad campaign.

Simplicity was a deliberate choice. Chime doesn't offer investing, crypto, or dozens of products.

They do one thing — be a great bank account for everyday Americans — and do it well. While competitors like Cash App and Revolut chased feature bloat, Chime stayed focused on the core banking experience.

Sierra

Sierra went straight for big brands, not tiny startups. SoFi, Ramp, ADT, Sonos and Brex signed up early.

By 2026 it said more than 40% of the Fortune 50 were customers. The trick was trust.

Enterprises are terrified of an AI bot going rogue and insulting a customer. So Sierra built guardrails and let each company control exactly how the agent behaves.

Bret Taylor's contacts did the rest. When the chairman of OpenAI calls a Fortune 500 CEO, they pick up.

Sierra hit $100 million in annual recurring revenue in November 2025, seven quarters after launch, and $150 million by February 2026. In April 2026 it launched Ghostwriter, which builds and deploys a new agent from a plain-English description.

Chime

Chime is not actually a bank. They're a fintech company that partners with Bancorp Bank and Stride Bank to hold deposits and issue cards.

This distinction matters because Chime doesn't have the regulatory protections and permissions that come with a bank charter. In 2021, the state of California ordered Chime to stop calling itself a bank in advertising.

The regulatory status limits what products Chime can offer and adds counterparty risk.

Unit economics have been questioned. Chime spends heavily on customer acquisition — hundreds of dollars per member through advertising.

If members don't use their Chime card frequently enough, the interchange revenue doesn't cover the acquisition cost. Chime needs high engagement to make the model work, and some members treat Chime as a secondary account rather than their primary bank.

The path to IPO has been repeatedly delayed. Chime was expected to IPO in 2022 but the fintech market crash made that impossible.

The company listed on Nasdaq in June 2025 at $11.6 billion, well below its 2021 peak of $25 billion. Public markets now price it in the open, which is a harsher judge than a private round.

Sierra

Everyone is building AI customer service agents right now. Decagon has raised at a multi-billion valuation.

Salesforce, ServiceNow and Intercom all shipped their own agents. Sierra is not the cheap option.

It sells premium AI to giant companies that move slowly. The bigger risk sits underneath the product.

Sierra does not make its own AI models. It rents them from providers like OpenAI and Anthropic.

If those model makers decide to compete directly, Sierra's edge gets thin fast, and its co-founder chairing one of them only makes that question louder. A $15.8 billion valuation on roughly $150 million in revenue leaves almost no room for a stumble.

Chime

Chime Spending Account is the core — a fee-free checking account with a Visa debit card. Chime Savings Account offers automatic round-ups and a competitive APY.

SpotMe lets members overdraft up to $200 with no fees — Chime covers the difference and deducts it from the next deposit. MyPay gives members access to earned wages before payday.

The Chime Credit Builder card helps members build credit by reporting on-time payments to all three bureaus — no credit check required, no interest, secured by your own money. Instant Transfers move money between Chime members instantly.

Sierra

The core product is the Sierra AI agent. It is a branded customer service bot that companies deploy on their website, app, and phone lines.

It handles the boring stuff. Order tracking.

Refunds. Password resets.

Account changes. Sierra also built its own tools to test and monitor these agents so they do not make things up.

In 2024 the company added a voice version that talks to customers on the phone. In April 2026 it added Ghostwriter, a tool that builds and deploys a new agent from a plain-English description.

The whole pitch is one AI agent that carries your brand's name and never sleeps.

Chime

DST Global, General Atlantic, Tiger Global, Sequoia Capital, SoftBank, Coatue Management, Dragoneer

Sierra

Sequoia Capital and Benchmark wrote the first checks at launch in February 2024, $110 million between them. Greenoaks Capital then led both the $175 million round in 2024 and the $350 million round in September 2025.

In May 2026 Tiger Global and Google's GV led a $950 million round at a $15.8 billion valuation, with Benchmark, Sequoia and Greenoaks back in. That takes total funding to about $1.6 billion.

That is partly the product and partly Bret Taylor. Investors bet on founders who have already built billion-dollar things.