Embedded-finance provider tracked in the Embedded Finance Index — disclosed by 3 companies across 1 category.
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Founded in 2014 as Fattmerchant with a disruptive flat-rate/interchange-plus subscription model for SMB payment processing, the company rebranded to Stax in 2021 and expanded from pure payment processing into a full integrated payments platform. Stax layered on embedded payments for ISVs (Stax Connect), billing/invoicing (Stax Bill with Avalara tax automation), and SMB lending (Stax Lending/Capital), positioning itself as an all-in-one financial OS for SMBs and software platforms. The original sibling founders exited circa 2023–2024 as the company crossed $1.1B valuation; new leadership is executing a go-to-market and technology realignment in 2026.
Other PSP providers in the index, by the number of companies that disclose them. A count of public disclosures, not a ranking of the products.
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alt="Ranked #183 of 538 in PSP — Embedded Finance Index 2026">
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<img src="https://www.embeddedfinanceindex.com/api/badge/stax/install" width="1" height="1" alt="" style="display:none">3 companies disclose Stax in their stack in the Embedded Finance Index 2026, including Virtuous, Dispatch and ClientTether.
Stax is an embedded-finance provider in PSP. It ranks #183 of 538 PSP providers by disclosed buyers.
The most-disclosed PSP alternatives to Stax are Stripe (782 buyers), Adyen (278 buyers), PayPal (153 buyers), Checkout.com (113 buyers), Worldpay (89 buyers) and Mollie (64 buyers).
Stax was founded by Suneera Madhani and Sal Rehmetullah and is founded in 2014, headquartered in Orlando, FL, United States.
Stax has raised $245M in total.
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