Checkbook
Your payments simplified. Global Payments pushed for you through one API.
47 employees · est. 2015 · San Mateo, United States
Underpay
You don't need a credit card to earn rewards (anymore)
1 employees · est. 2022 · London, United Kingdom
Checkbook is the older company (2015 vs 2022); Checkbook is the larger of the two.
Side-by-Side Comparison
| Metric | Checkbook | Underpay |
|---|---|---|
| Founded | ||
| Founded | 2015 older | 2022 |
| Headquarters | ||
| Headquarters | San Mateo, United States | London, United Kingdom |
| Employees | ||
| Employees | 47 larger | 1 |
| Industry | ||
| Industry | API, Financial Services, Fintech | Finance, Financial Services, Fintech |
| Funding Stage | ||
| Funding Stage | Series A | Pre Seed |
| Total Funding | ||
| Total Funding | $11.80M | $200.00K |
| Funding Rounds | ||
| Funding Rounds | 2 | 1 |
| Services | ||
| Services | Not tracked yet | Not tracked yet |
| Target Customers | ||
| Target Customers | Not tracked yet | Not tracked yet |
| Taxonomy | ||
| Taxonomy | Digital Payments, Payment Processing, API Integration, Accounts Payable, Accounts Receivable, Online Payments, Cost-Savings, Convenience, Business Efficiency, Banking Integration, Financial Technology, Accounting Software Integration, Global Payments | Online Payments, Rewards Program, Banking, Financial Services, Customer Loyalty, Digital Payments |
| Website | ||
| Website | checkbook.io | underpay.io |
About Checkbook
Checkbook, founded in 2015, is a promising fintech company headquartered in the United States, operating across several industries including API, Financial Services, Fintech, and Payments. With the slogan "Your payments simplified. Global Payments pushed for you through one API," Checkbook offers a...
About Underpay
Underpay is a cutting-edge fintech company based in the United Kingdom, founded in 2022. The company's innovative approach to the finance industry promises to revolutionize how consumers earn rewards without the need for credit cards. Their slogan, "You don't need a credit card to earn rewards (anym...
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BounceWatch watches Checkbook and Underpay for new funding, fast hiring, new executives and a change of software vendor. When one happens, we email you the same day.
Funding, hiring, leadership and stack changes at Checkbook and Underpay — by email.
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Related Comparisons
Compiled from the BounceWatch company index. We last looked at Checkbook on 12 Sep 2024, and Underpay on 3 Jul 2025. Where a field is blank here, it means we have not recorded it — not that the answer is zero. How we source and date this.