Company lists · Data refreshed September 2026
Top 25 Api-first agencies based in the United States
RevenueBase identified 206 api-first agencies headquartered in the United States as of September 2026 and tracks 5,737 professional contacts across them, including 982 with verified work emails. New York is the largest hub.
This list covers api-first agencies 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 21, 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.
The 25 largest api-first agencies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 688 contacts → | ||||
Indirect evidence “MSys Technologies (SDC Awards Winner) is a reliable partner for product engineering services and digital transformation projects for its Enterprise and Silicon Valley clientele.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 214 contacts → | ||||
Indirect evidence “Zemoga is now Monks Technology Services, part of Monks.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 205 contacts → | ||||
Indirect evidence “Blue Altair is a niche, industry-recognized business and technology consulting firm that assists our clients with digital transformations.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 194 contacts → | ||||
Indirect evidence “In a complex, unpredictable world, adaptability is essential.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 174 contacts → | ||||
Indirect evidence “Organizations today are under pressure to innovate faster, adopt Artificial Intelligence, and build scalable digital platforms.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 135 contacts → | ||||
Indirect evidence “White Rabbit Group is a software development agency with a highly diverse and creative team that takes an idea through development and into scale.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 103 contacts → | ||||
Indirect evidence “70-90% of projects fail.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 95 contacts → | ||||
Indirect evidence “Empowering Your Business for the Future Acklen Avenue is your strategic partner in digital transformation, delivering agile, custom software solutions that revolutionize how you…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 82 contacts → | ||||
Indirect evidence “Mobomo builds elegant solutions to solve complex problems.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 69 contacts → | ||||
Indirect evidence “We deliver software solutions that create lasting impact for our clients, our people, and our community.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 62 contacts → | ||||
Indirect evidence “Our expertise covers various aspects of information system development, starting from understanding the business to operating systems in production-Definition of software…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 53 contacts → | ||||
Indirect evidence “Inceptive is a software consulting agency that helps clients globally in their digital transformation journey.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 50 contacts → | ||||
Indirect evidence “DyCoders is a US-based software and product development company delivering scalable, high-impact digital solutions for businesses worldwide.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 39 contacts → | ||||
Indirect evidence “Welcome to Band of Coders - Where Technology Fuels Innovation!” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 38 contacts → | ||||
Partial evidence “RESKOM is your trusted business partner in the areas of API-led integration, Enterprise Application Integration, Data Integration, and API Management, delivering seamless digital…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 33 contacts → | ||||
Indirect evidence “Custom Software Solutions Our mission and focus is completely tied to our understanding of what customers truly desire when working with a software development firm.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 31 contacts → | ||||
Partial evidence “ShakaCode is a global, remote-first software consultancy helping engineering organizations ship production software and adopt AI coding agents safely and effectively.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 29 contacts → | ||||
Indirect evidence “At RoundTechSquare, we believe that every business deserves digital solutions that inspire growth and innovation.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 29 contacts → | ||||
Indirect evidence “Stop waiting for things to happen and make them happen!” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 24 contacts → | ||||
Indirect evidence “Foster Made is a Richmond-based digital agency specializing in modern, composable technology for forward-thinking organizations.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 22 contacts → | ||||
Indirect evidence “Zuplon builds software businesses can rely on and the SaaS products to prove it.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 21 contacts → | ||||
Indirect evidence “Mapleton Hill helps complex organizations modernize digital platforms and ship products faster with AI native workflows.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 20 contacts → | ||||
Indirect evidence “At FDG Web, we approach digital transformation as a strategic business initiative.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 19 contacts → | ||||
Indirect evidence “Fractional CTO services, MVP development, data migration, legacy code modernization and more, built by a US-based senior team that works directly with B2B companies between 15 and…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 18 contacts → | ||||
Indirect evidence “Enqbator helps our partners transform complex challenges into simple, human-centered digital experiences.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
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: api-first agencies. 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 api-first agencies.
- Partial evidence
- Its own public description names part of api-first agencies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name api-first agencies. 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 206 api-first agencies based in the United States
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Api-first agencies based in the United States at a glance
As of Sep 21, 2026Companies by employee count
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 206 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 api-first agencies, 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 “api-first agencies”. 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 api-first agencies), 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 api-first agencies, 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, 982 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 21, 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 api-first agencies, 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 api-first agencies are there based in the United States?
RevenueBase identified 206 api-first agencies 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?
Msys Technologies, headquartered in Alpharetta Atlanta, tops this list with the largest team on record.
Which city has the most api-first agencies?
New York leads with 13 headquartered companies, followed by Atlanta (8) and Miami (7).
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 982 verified decision-maker contacts tracked across these 206 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 21, 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.