Money and cash flow are the lifeblood of a small business. And it's an area often overlooked by traditional online banking providers. So a number of fintech companies have emerged during the past decade-plus to better serve SMB needs. Most providers operate on a dual revenue model which includes:
a.) monthly subscription fees to create predictable recurring revenue
b.) transaction fees to cover interchange and other variable processing costs.

We divided the payment providers into four categories:

  1. Charge card & expense management (see the list)
  2. Bill payments and/or invoicing specialists (see below)
  3. Payment processors (See the list)
  4. Subscription management platforms (See the list)

Unlike other fintech areas, 7 of the top 10 providers are at least 15 years old. And none of the 22 started in the past 6 years.

Year founded: 2000 to 2009 >>> 8   |   2010 to 2014 >>> 6   |   2015 to 2019 >>> 8    |   2020 or later >>> 0

Resources: Looking for digital banks, lenders, payment providers, insurance or digital accounting for small businesses? Check out our latest lists: Small Business (SMB) savings/treasury accounts (7) | SMB online lenders (33) | SMB challenger banks (15) | SMB insurers (15) | SMB credit cards/expense management (16) | Billpay & invoicing (16)| Payment processors (7) | SMB digital accounting/bookkeeping (21) | Cloud Payroll Providers (20)

The FAB Score (Fintech Attention Barometer) is a proxy for the size and growth of fintech companies founded since 1999. 

Top U.S. BillPay & Invoicing Startups (ranked by FAB score***)

Rank Company FAB Score Review Founded HQ Total Funding ($M) Visits (May'26)
* Quickbooks (Intuit) NA 9 Jun 26 1983 SF 14,200,000
1 Rippling Spend 2851 9 Jun 26 2016 SF $2,437 9,400,000
2 Bill.com 1614 9 Jun 26 2006 SF 1500 4,900,000
3 Airwallex 1564 9 Jun 26 2015 Singapore 1532 5,600,000
4 Wave Payments (HR Block) 1305 9 Jun 26 2009 Toronto 80 6,500,000
5 Freshbooks 598 9 Jun 26 2003 Toronto 457 2,500,000
6 Tipalti 471 9 Jun 26 2010 SF 915 1,100,000
7 Tradeshift 323 9 Jun 26 2009 SF 1100 200,000
8 Melio 256 9 Jun 26 2018 NYC 654 530,000
9 AvidExchange 160 9 Jun 26 2000 Charlotte, NC 1100 89,000
10 Emburse (ChromeRiver≥) 103 9 Jun 26 2014 LA 0.1 520,000
11 Stampli 99 9 Jun 26 2015 SF 147 280,000
12 Vcita 89 9 Jun 26 2010 Seattle 15 460,000
13 BillerGenie 71 9 Jun 26 2018 Miami 33.9 270,000
14 Autobooks 62 9 Jun 26 2015 Detroit 153 100,000
15t Bonsai (Zoom) 55 9 Jun 26 2016 SF 0 270,000
15t Plastiq 55 9 Jun 26 2012 SF 153 180,000
17 Plooto 52 9 Jun 26 2015 Toronto 26 240,000
18 PaySimple 44 9 Jun 26 2006 Denver 145 160,000
19 Onlinecheckwriter 31 9 Jun 26 2008 SF 2.7 190,000
20 InvoiceNinja 25 9 Jun 26 2014 Hefa, Israel 0 130,000
21 Invoice2go (Bill.com) 20 9 Jun 26 2002 SF 60 120,000
22 Routable 14 9 Jun 26 2017 Seattle 47 27,000
23 Beanworks 9 9 Jun 26 2012 Vancouver 12 50,000

Source: FintechLabs, 16 June 2026 with data from Crunchbase, SimilarWeb, SEMrush, Pitchbook, Linkedin
Note: Social data from Aug 2025

* Sponsor
**Funding is the amount invested into the company as either equity or debt.
***As nerds do, we are developing a proprietary score measuring the adoption of digital financial services at private companies that do not release traditional metrics (# customers, deposits, AUM, etc). We call it the FAB score, standing for Fintech Attention Barometer. The score uses money raised, valuation and website traffic as a proxy for company size and velocity of growth. It’s a work in progress, so expect changes down the road.

Disclosure: We may receive referrals from company's listed. If it changes their ranking, we indicate that with an “*”

Challenger Billpay & Invoicing Suppliers in the United States

Sponsor: Quickbooks Bill Pay (Intuit)
– HQ: Mountain View, CA
– Founded: 1983

Traction:
– Website visits (May 2026)
>>> Quickbooks: 12.0 million (SimilarWeb)
>>> Intuit: 104 million (SimilarWeb)

1. Rippling Spend
FAB Score = 2,850 (up 60 since April 2026)
– HQ: San Francisco
– Founded: 2009

Traction:
– Raised $2.4B  including $450M in May 2025, $790M in 2024, $500M in 2023 (Crunchbase)
– Website visits (May 2026): 9.4M (SimilarWeb)
– Employees (Pitchbook): 6,480 vs. 3,630 in July '25

Social:
– LinkedIn:  306,000 followers (6,040 employees vs. 5,540 in July '25)
– iOS rating: 4.7 (6,200 reviews vs. 4,500 in July '25)
– Trustpilot: 4.6 (1,570 reviews vs 1,240 in July '25)
– G2: 4.8 (10,030 reviews vs. 7,960 in July '25)

2. Bill (see also #21 Invoice2Go)
FAB Score = 1,610
– HQ: San Francisco Bay Area
– Founded: 2006

Traction:
– Raised $1.5 billion including $216M in its Dec 2019 IPO (Crunchbase)
– Annual revenue (TTM): $1.6B (Yahoo)
– Market Cap: $4.1B (NYSE: BILL 15 May '26)
– Website visits (May 2026): 4.9 million (SimilarWeb)
– Employees: 3,360 vs 3,000 in Aug '25; 2,190 Jan to July '25; vs 2,620 Jan '24; 2,370 in Aug '23 (Pitchbook)

Social:
– LinkedIn: 68,000 followers (3,340 vs 3,320 in July; 3,180 in Jan '25; 2,990 in Sep '24; 2,930 in Jan '24; 2,950 in Aug '23)
– iOS rating: 4.9 (48,700 unchanged since July; 47,300 in Jan)
– Capterra: 4.2 (550 reviews vs. 541in July; 528 in Jan)

3. Airwallex
FAB Score = 1,560 (up 480)
– HQ: Singapore
– Founded: 2015

Traction:
– Raised: $1.5B including $630M in 2o25; $100M in 2022 (Crunchbase)
– Website visits (May 2026): 5.6 million (SimilarWeb)
– Employees: 2,200 vs. 1,700 in Aug '25, 1,600 in Jan '25 (Pitchbook)

Social:
– LinkedIn: 124,000 followers (2,000 employees vs. 1,760 in July; 1,610 employees in Jan '25; 1,370 in Sep '24)

4. Wave (acquired by H&R Block)
FAB Score = 1,310 (down 20)
– HQ: Toronto
– Founded: 2009

Traction:
– Raised $79.8M (Crunchbase)
– Exit: Acquired by H&R Block for US$400M in June 2019
– Website visits (May 2026): 6.5 million (SimilarWeb)
– Employees (Pitchbook): 303 unchanged since Aug '25;  vs 312 in July '25; 308 in Jan '25; 367 Sep '24; 303 Jan '24; 304 Aug '23; 339 Mar '23)

Social:
– LinkedIn:  22,000 followers (297 employees vs. 313 in July; 309 in Jan '25; , 305 Sep '24; 300 Jan '24; 303 Aug '23; 305 Mar '23)
– iOS rating: 4.4 (6,300 reviews, up 200 since Jan)
– Rating: 4.4 ( 1,690 reviews per Software Advice, up 40 since Jan).

5. Freshbooks
FAB Score = 598 (down 40)
– HQ: Toronto
– Founded: 2003

Traction:
– Raised $457 including $125M in 2025, $131M in 2021 and $125M in 2022 (Crunchbase)
– Website visits (May 2026): 2.5 million (SimilarWeb)
– Employees: 454 unchanged since July '25; 571 in Jan '25 (Pitchbook)

Social:
– LinkedIn: 90,000 followers (420 employees vs. 442 in July; 481 in Jan '25; 588 in Sep '24; 617 in Jan '24; 664 in Aug '23; 698 in Mar '23)
– iOS rating: 4.7 (10,900 reviews, unchanged since Sep '24)
– SoftwareAdvice rating: 4.5 ( 4,500 reviews, up 20 since Jan)

6. Tipalti
FAB Score = 471 (up 20)
– HQ: San Francisco
– Founded: 2010

Traction:
– Raised $915M including $200M (debt) in 2025; $150M (debt) in May 2023 & $270M in 2021 (Crunchbase)
– Valuation: $8.3B (based on Dec 2021 round)
– Website visits (May 2026): 1.1 million (SimilarWeb)
– Employees: 1,351 unchanged since Aug. '25; was 1,355 in July '25; 1,310 in Jan '25; 1,240 in Sep '24; 1,050 in Jan '24; 1,110 in Aug '23; up 1,126 April '23 (Pitchbook)

Social:
– LinkedIn:  57,000 followers (1,310 employees vs. 1,350 in July; 1,320 in Jan '24; 1,280 in Sep '24; 1,110 in Jan '24; 1,030 in Aug. '23; up 1.010 in April '23)
– G2 rating: 4.5 (334 reviews, up 128 since Jan)

7. Tradeshift
FAB Score = 323 (up 3)
– HQ: SF
– Founded: 2009

Traction:
– Raised $1.1B (Crunchbase)
– Website visits (May 2026): 200,000 (SimilarWeb)
– Employees: 501 unchanged from Aug '25 (Pitchbook)

Social:
– LinkedIn: 73,000 followers (381 employees)
– G2 rating: 3.8 (212 reviews)

8. Melio
FAB Score = 256 (up 6)
– HQ: NYC
– Founded: 2018

Traction:
– Raised $654M including $150M in 2024, $360M in 2021 (Crunchbase)
– Website visits (May 2026): 530,000 (SimilarWeb)
– Employees: 686 vs. 669 in Aug '25 , vs 642 in July; 625 in Jan '25; 618 in Sep '24; 632 in Jan '24; 602 in Aug '23; 597 in April '23 (Pitchbook)

Social:
– LinkedIn: 35,000 followers (684 employees vs. 656 in July; 625 in Jan '25; 614 in Sep '24; 646 in Jan '24; 644 in Aug '23; 597 in April '23)
– Capterra rating: 4.2 (396 reviews vs. 391 in July; 383 Jan '25)

9. AvidXchange (acquired by TPG, May 2025)
FAB Score = 160 (unchanged)
– HQ: Charlotte, NC
– Founded: 2000

Traction:
– Raised: $1.1B including $660M in 2021 (Crunchbase)
– Valuation: Acquired for $2.2B in May 2025
– Annual revenue: Revenues $440M (2024) (Yahoo)
– Website visits (May 2026): 89,000 (SimilarWeb)
– Employees: 1,765 vs. 1,759 in Aug '25; was 1,600 July '25 to Nov '22 (Pitchbook)

Social:
– LinkedIn:  55,000 followers (1,780 employees vs. 1,760 in July '25; 1,730 in Jan '25; 1,710 in Sep '24; 1,640 in Jan '24 & Aug '23; 1,540 in April '23)
– G2 review:  4.4 (287 reviews vs. 266 reviews in July; 262 in Jan '25)

10. Emburse (acquired by Chrome River in 2019; Chrome River merged with Certify in 2019)
FAB Score = 103 (up 6)
Founded: 2014
HQ: LA

Traction:
Funding: $120,000 in 2016 (Crunchbase)
Website visits (May 2026): 520,000 (SimilarWeb)
Employees: 869 unchanged since Aug. '25; was 840 in July '25; 1,000 Jan '25 through Aug '23 (Pitchbook)

Social:
LinkedIn: 50,000 followers (865 employees vs. 851 in July; 808 in Jan '25; 852 in Sep '24; 946 in Jan. '24; 952 in August '23)

11. Stampli
FAB Score = 99 (up 16)
– HQ: San Francisco Bay Area (Mountain View)
– Founded: 2015

Traction:
– Raised $146M including $61M in 2023 and $50M in 2021 (Crunchbase)
– Website visits (May 2026): 280,000 (SimilarWeb)
– Employees: 302 vs 315 in Aug '25; was 308 in July; 307 in Jan '25; 300 Sep '24; 265 in Jan. '24; 217 in Aug '23; 214 in Nov '22 (Pitchbook)

Social:
– LinkedIn: 10,000 followers (301 employees vs. 313 in July; 312 in Jan '25; 297 in Sep '24; 275 in Jan '24; 245 in Aug '23; 220 in April '23)
– G2 rating: 4.6 (1,620 reviews vs. 1,480 in July; 1,370 Jan '25)

12. Vcita
FAB Score = 89 (down 2)
– HQ: Seattle area (Bellevue)
– Founded: 2010

Traction:
– Raised $15M prior to 2021 (Crunchbase)
– Website visits (May 2026): 460,000 (SimilarWeb)
– Employees: 200 unchanged since Aug '23; vs 172 in April '23 (Pitchbook)

Social:
– LinkedIn:  14,000 followers (189 employees vs. 187 employees in July; 185 in Jan '24; 184 in Sep '24; 180 in Jan '24; 191 in Aug '23; 174 in April '23)
– iOS rating: 3.5 (104 reviews vs. 103 in July; 100 Jan '25)
– Software Advice rating: 4.4 (276 reviews, unchanged since July; 275 Jan '25)

13. BillerGenie
FAB Score = 71 (up 4)
– Founded: 2018
– HQ: Miami

Traction:
– Funding: $33.9M including $22.4M in Jan 2026; $2M in May 2025, $6M in 2022 (Crunchbase)
– Articles: 19 (Crunchbase)
– Website visits (May 2026): 270,000 (SimilarWeb)
– Employees: 80 vs 60 in Aug '25; was 50 July – Jan '25; vs. 42 in Sep '24; 40 in Jan '24 & Aug '23 (Pitchbook)

Social:
– LinkedIn: 10,000 followers (67 employees vs. 54 in July; 51 in Jan '25; 46 in Sep '24; 38 in Jan. '24; 37 in Aug '23)

14. Autobooks
FAB Score = 62 (up 1)
– Founded: 2015
– HQ: Detroit, Michigan

Traction:
– Raised: $153M including $55M in May 2025, $25M in 2021, & $50M in 2022 (Crunchbase)
– Website visits (May 2026): 100,000 (SimilarWeb)
– Employees: 101 vs. 100 in Aug '25; was 86 July – Jan '25; vs. 92 in Jan '24 & Aug '23; 141 in April '23 (Pitchbook)

Social:
– LinkedIn: 6,000 (100 employees vs. 86 in July '25 and Jan '25; 85 in Sep '24; 91 in Jan '24; 92 in Aug '23; 99 in April '23)
– FeaturedCustomers: 4.8 (979 reviews, up 79 since Jan)

15 (tie). Bonsai (acquired by Zoom)
FAB Score = 55 (down 6)
– HQ: San Francisco
– Founded: 2016

Traction:
– Raised: $120,000 in 2016 (Crunchbase)
– Website traffic (May 2026): 270,000 (SimilarWeb)
– Employees: 49 unchanged since Aug '25;  was 57 in July – Jan '25; 50 in Sep '24 & Jan '24; 49 in Aug '23; 27 in April '23 (Pitchbook)

Social:
– LinkedIn followers: 16,000 (57 employees vs. 52 in July; 53 in Jan '25; 52 in Sep '24; 48 in Jan '24 & Aug '23; 32 in April '23)
– Trustpilot score: 4.1 (484 reviews vs. 457 in July '25; 445 Sep '24)

15 (tie). Plastiq (acquired by Priority, Aug 2023)
Fab score = 55 (unchanged)
– Founded: 2012
– HQ: San Francisco

Traction:
– Raised: $153 million including $75M in 2020 (Crunchbase)
– Website visits (May 2026): 180,000 (SimilarWeb)
– Employees: 103 unchanged since Aug '23; was 163 in April '23 (Pitchbook)

Social:
– LinkedIn: 7,000 followers (54 employees vs. 55 in July; 58 in Jan '25; 61 in Sep '24; 82 in Jan '24; 102 in Aug '23; 133 in April '23)
– Trustpilot: 2.4 (957 reviews vs. 953 in July; 952 Jan '25)

17. Plooto
FAB Score = 52 (up 10)
– HQ: Toronto
– Founded: 2015

Traction:
– Raised $26M including $20M in 2022 (Crunchbase)
– Website visits (May 2026): 240,000 (SimilarWeb)
– Employees: 111 unchanged since Aug '25; was 130 July '25 – Sep '24 (Pitchbook)

Social:
– LinkedIn: 9,000 followers (110 employees vs. 108 in July; 116 in Jan '25; 117 in Sep '24)

18. PaySimple (division of EverCommerce)
FAB Score = 44 (up 4)
– HQ: Denver, Colorado
– Founded: 2006

Traction:
– Raised $145M prior to 2021 (Crunchbase)
– Website visits (May 2026): 160,000 (SimilarWeb)
– Employees: 83 (Linkedin), down 8 since Nov 2022

Social:
– LinkedIn: 5,000 followers (59 employees vs. 62 in July; 67 in Jan '25; 71 in Sep '24; 74 in Jan '24; 84 in Aug '23; 83 in April '23)
– iOS rating: 4.5 (note: only 2 reviews)
– Capterra rating: 4.5 (300 reviews, unchanged since July; 299 Jan '25)

19. Online Check Writer (ZilMoney)
FAB score = 31 (down 6)
– Founded: 2008
– HQ: San Francisco

Traction:
– Raised: $2.7M prior to 2020 (Crunchbase)
– Website visits (May 2026): 190,000 (SimilarWeb)
– Employees: 200 vs. 138 in Aug. '25;  was 137 in July; 134 in Jan '25; 133 in Sep '24 & Jan '24; 132 in Aug '23 (Pitchbook)

Social:
– LinkedIn: 32,000 followers (138 employees vs. 139 in July '25; 136 in Jan '25; 134 in Sep '24; 130 in Jan. '24; 127 in Aug '23; 113 in April '23)
– Trustpilot: 4.0(1,630 reviews vs. 1,640 reviews in July; 1,620 Jan '25)

20. InvoiceNinja
FAB Score = 25 (down 4)
– HQ: Hefa, Israel
– Founded: 2014

Traction:
– Raised Unknown (Crunchbase)
– Website visits (May 2026): 130,000 (SimilarWeb)
– Employees: 5 (LinkedIn)

Social:
– LinkedIn: 580 followers (5 employees, unchanged since Aug '23)
– iOS rating: 4.8 (92 reviews vs. 83 in July; 78 Jan '25)
– Software Advice rating: 4.7 (166 reviews vs. 165 in July; 164 Jan '25)

21. Invoice2Go (acquired by Bill.com)
FAB Score = 20 (unchanged)
– HQ: San Francisco
– Founded: 2002

Traction:
– Raised $60M prior to 2021 (Crunchbase)
– Exit: Acquired by Bill.com for $625M in July 2021
– Website visits (May 2026): 120,000 (SimilarWeb)
– Employees: 106, unchanged since April '23 Pitchbook

Social:
– LinkedIn:  9,000 followers (13 employees, unchanged since Jan '25; vs. 19 in Sep '24; 24 in Jan '24; 44 in Aug '23; 51 in April '23)
– iOS rating: 4.9 (52,800 ratings; vs 51,600 in July; 50,300 Jan '25)
– Capterra rating: 4.3 (267 reviews vs. 262 in July; 251 Jan '25)

22. Routable
FAB Score = 14 (up 1)
– HQ: Seattle
– Founded: 2017

Traction:
– Raised $46.5M including $30M in 2021 (Crunchbase)
– Website visits (May 2026): 27,000 (SimilarWeb)
– Employees: 72 vs. 81 from Aug to Jan '25; was 100 in Sep '24; 119 in Jan '24; 129 in Aug '23 (Pitchbook)

Social:
– LinkedIn: 11,000 followers (77 employees vs. 80 employees in July to Jan '25; 85 in Sep '24; 110 in Jan '24; 118 in Aug '23; 134 in April '23)
– FeaturedCustomers rating: 4.8 (1,010 reviews; vs. 880 in July; 763 Jan '25)

23. Beanworks (acquired by Quadient, March 2021)
FAB Score = 9 (up 3)
– Founded: 2012
– HQ: Vancouver, Canada

Traction:
– Funding: $12.3M in 2017 and 2018 (Crunchbase)
– Website visits (May 2026): 50,000 (SimilarWeb)
– Employees: 140, unchanged since Aug '25; was 90 July '25 to Aug '23 (Pitchbook)

Social:
– LinkedIn: 10,000 followers (98 employees vs. 109 in July to Jan '25; 115 in Sep '24; 129 in Jan '24; 133 in Aug '23)