Company lists · Data refreshed September 2026

Top 25 Invoice and payment software developers based in the United States

Name: Invoice and payment software developers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 579 companies tracked

RevenueBase identified 579 invoice and payment software developers headquartered in the United States as of September 2026 and tracks 64,439 professional contacts across them, including 27,253 with verified work emails. New York is the largest hub.

This list covers invoice and payment software developers headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

579Companies

64,439Contacts tracked

27,253Verified emails

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The 25 largest invoice and payment software developers based in the United States

Ranked by team size

Top 25 of 579 invoice and payment software developers based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to invoice and payment software developers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Global Payments INC	Strong evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	10001+	11,147 contacts →
	Strong evidence “Global Payments (NYSE: GPN) is a leading payment technology and software company that powers commerce for businesses of all sizes worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
2	Worldpay	Strong evidence	Cincinnati, OH, United StatesHQ checked Sep 28, 2026	5,001-10,000	8,097 contacts →
	Strong evidence “Worldpay combined with Global Payments in January 2026 to create a leading payments technology and software company that powers commerce for businesses of all sizes worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
3	Square	Indirect evidence	San Francisco, AZ, United StatesHQ checked Sep 28, 2026	1,001-5,000	6,194 contacts →
	Indirect evidence “Since we opened our doors in 2009, the world of commerce has evolved immensely, and so has Square.” Source: RevenueBase Database · checked Sep 28, 2026
4	ACI Worldwide	Strong evidence	Elkhorn, NE, United StatesHQ checked Sep 28, 2026	1,001-5,000	4,588 contacts →
	Strong evidence “ACI Worldwide, an original innovator in global payments technology, delivers transformative software solutions that power intelligent payments orchestration in real time so banks…” Source: RevenueBase Database · checked Sep 28, 2026
5	Heartland	Strong evidence	Oklahoma City, OK, United StatesHQ checked Sep 28, 2026	1,001-5,000	3,787 contacts →
	Strong evidence “Global Payments Inc.(NYSE: GPN), a leading worldwide provider of payment technology and software solutions, announced the unification of its technology stack under a single brand…” Source: RevenueBase Database · checked Sep 28, 2026
6	Deluxe	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 28, 2026	5,001-10,000	3,695 contacts →
	Partial evidence “Deluxe, a trusted payments and data company, champions business so communities thrive.” Source: RevenueBase Database · checked Sep 28, 2026
7	Elavon	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,885 contacts →
	Indirect evidence “Elavon, a wholly owned subsidiary of U.S.” Source: RevenueBase Database · checked Sep 28, 2026
8	Bottomline	Indirect evidence	Portsmouth, NH, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,548 contacts →
	Indirect evidence “At Bottomline, we help businesses pay and get paid.” Source: RevenueBase Database · checked Sep 28, 2026
9	Fleetcor	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	5,001-10,000	1,589 contacts →
	Indirect evidence “FLEETCOR Technologies rebranded as Corpay on March 25, 2024.” Source: RevenueBase Database · checked Sep 28, 2026
10	Flywire	Strong evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,194 contacts →
	Strong evidence “Flywire Corporation (Nasdaq: FLYW) is a global payments enablement and software company.” Source: RevenueBase Database · checked Sep 28, 2026
11	Paymentus	Partial evidence	Charlotte, NC, United StatesHQ checked Sep 28, 2026	1,001-5,000	935 contacts →
	Partial evidence “Paymentus® (NYSE: PAY) is the leading provider of real-time, cloud-based billing, payment, and customer engagement solutions.” Source: RevenueBase Database · checked Sep 28, 2026
12	MELIO	Partial evidence	New York, United StatesHQ checked Sep 28, 2026	501-1,000	652 contacts →
	Partial evidence “Join over businesses simplifying bill payments and optimizing cash flow with Melio.” Source: RevenueBase Database · checked Sep 28, 2026
13	Fullsteam	Partial evidence	Auburn, AL, United StatesHQ checked Sep 28, 2026	1,001-5,000	633 contacts →
	Partial evidence “Backed by Aquiline Capital Partners and ADIA, Fullsteam is a dynamic and growing team of over 2,100 employees committed to driving innovation and delivering best-in-class software…” Source: RevenueBase Database · checked Sep 28, 2026
14	Fortis	Partial evidence	Plano, TX, United StatesHQ checked Sep 28, 2026	201-500	359 contacts →
	Partial evidence “Payments shouldn’t live outside your business systems.” Source: RevenueBase Database · checked Sep 28, 2026
15	CARET	Indirect evidence	Del Mar, CA, United StatesHQ checked Sep 28, 2026	201-500	331 contacts →
	Indirect evidence “CARET brings the latest in technology and automation to over legal and accounting firms, empowering highly skilled professionals to refocus their expertise on what truly matters.” Source: RevenueBase Database · checked Sep 28, 2026
16	Celero Commerce	Strong evidence	Nashville, TN, United StatesHQ checked Sep 28, 2026	201-500	313 contacts →
	Strong evidence “Celero Commerce offers payment processing services, business management software, and data intelligence to small and medium-sized businesses, in one holistic platform.” Source: RevenueBase Database · checked Sep 28, 2026
17	Stax Payments	Partial evidence	Orlando, FL, United StatesHQ checked Sep 28, 2026	201-500	295 contacts →
	Partial evidence “Stax Payments is a leading, high-growth payments technology firm specializing in integrated payments, recurring billing, and SMB processing.” Source: RevenueBase Database · checked Sep 28, 2026
18	Paynearme	Partial evidence	Santa Clara, CA, United StatesHQ checked Sep 28, 2026	201-500	262 contacts →
	Partial evidence “PayNearMe builds technology to transform the payment experience for businesses and their customers.” Source: RevenueBase Database · checked Sep 28, 2026
19	Transcentra	Partial evidence	Norcross, GA, United StatesHQ checked Sep 28, 2026	1,001-5,000	231 contacts →
	Partial evidence “TransCentra is one of the largest and most trusted billing and payments providers in the U.S.” Source: RevenueBase Database · checked Sep 28, 2026
20	Slice Merchant Services	Partial evidence	Holmdel, NJ, United StatesHQ checked Sep 28, 2026	201-500	217 contacts →
	Partial evidence “Payment Solutions for Every Business 0% Processing Fee Program POS Systems • Local Sales & Support Helping businesses save more with every transaction.” Source: RevenueBase Database · checked Sep 28, 2026
21	Ebizcharge	Partial evidence	Irvine, CA, United StatesHQ checked Sep 28, 2026	201-500	210 contacts →
	Partial evidence “EBizCharge is the leading all-in-one integrated payment platform that helps businesses facilitate electronic payment processing, enhance transaction security, and increase client…” Source: RevenueBase Database · checked Sep 28, 2026
22	rev.io	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	51-200	192 contacts →
	Partial evidence “Rev.io is the only provider to seamlessly integrate native communication billing, professional service automation (PSA), and payment processing-delivering a comprehensive…” Source: RevenueBase Database · checked Sep 28, 2026
23	Global Payex	Partial evidence	Rockville, MD, United StatesHQ checked Sep 28, 2026	51-200	189 contacts →
	Partial evidence “Global PayEX is a B2B payments modernization-focused SaaS company which offers AI powered cloud platform for working capital optimization in B2B AR (accounts receivable) & AP…” Source: RevenueBase Database · checked Sep 28, 2026
24	Electronic Payments	Partial evidence	Calverton, NY, United StatesHQ checked Sep 28, 2026	501-1,000	184 contacts →
	Partial evidence “Electronic Payments is an industry leader in developing and delivering innovative payment processing and point of sale solutions to companies nationwide.” Source: RevenueBase Database · checked Sep 28, 2026
25	Pairsoft	Indirect evidence	Miami, FL, United StatesHQ checked Sep 28, 2026	51-200	172 contacts →
	Indirect evidence “PairSoft, one of the strongest financial automation platforms for mid-market and enterprise organizations, comprises a product lineup that natively integrates with Microsoft…” Source: RevenueBase Database · checked Sep 28, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: invoice and payment software developers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names invoice and payment software developers.
Partial evidence: Its own public description names part of invoice and payment software developers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name invoice and payment software developers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 579 invoice and payment software developers based in the United States

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Invoice and payment software developers based in the United States at a glance

As of Sep 28, 2026

42.3%Verified-email coverage

111.3Average contacts per company

11-50Median size (employees)

4.1%Largest-city concentration · New York

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

241

11-50

190

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 579 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among invoice and payment software developers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “invoice and payment software developers”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names invoice and payment software developers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among invoice and payment software developers, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 27,253 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 28, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names invoice and payment software developers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many invoice and payment software developers are there based in the United States?

RevenueBase identified 579 invoice and payment software developers headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Global Payments INC, headquartered in Atlanta, tops this list with the largest team on record.

Which city has the most invoice and payment software developers?

New York leads with 24 headquartered companies, followed by Atlanta (20) and San Francisco (19).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 27,253 verified decision-maker contacts tracked across these 579 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.