Company lists · Data verified August 2026

Top 18 Api platform companies based in the United States

Name: Api platform companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 47 companies tracked

There are 47 api platform companies headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 9,584 professional contacts across them, including 4,474 with verified work emails and 2,411 with mobile numbers. San Francisco is the largest hub.

This list covers api platform companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

47Companies

9,584Contacts tracked

4,474Verified emails

2,411Mobile numbers

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The 18 largest api platform companies based in the United States

Ranked by team size

Top 18 of 47 api platform companies based in the United States, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	F5	Seattle, WA	5,001-10,000	8,464	4,084
2	Sensedia	Miami Beach, FL	501-1,000	627	330
3	Layer7 API Security	San Jose, CA	n/a	41	3
4	Treblle	Wilmington, DE	11-50	23	15
5	Solsys	Miami, FL	11-50	18	1
6	ZUPLO	Seattle, WA	11-50	16	7
7	Requestly	San Francisco	201-500	14	7
8	Zyla Labs	Remote	11-50	14	3
9	Grafbase	San Francisco, CA	11-50	9	2
10	UNKEY	San Francisco	1-10	8	4
11	Talentgenius	San Francisco	1-10	7	6
12	Nevatech	Atlanta, GA	11-50	6	1
13	Revenium	Herndon, VA	11-50	4	2
14	Tailcall	Dover, DE	1-10	4	2
15	METLO	San Francisco, CA	1-10	3	2
16	Autocode	San Francisco, CA	1-10	3	1
17	Reprezen	Dobbs Ferry, NY	1-10	1	1
18	NERVE	San Francisco, CA	1-10	1	1

Showing 18 of 47 api platform companies based in the United States

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Api platform companies based in the United States at a glance

As of Aug 28, 2026

11-50Median size (employees)

San FranciscoLargest hub · 12 HQs

2,411Contacts with mobile numbers

16Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Api platform companies by metro

Metro	Companies
Api platform companies in San Francisco	12
Api platform companies in Boston	3
Api platform companies in Atlanta	2
Api platform companies in Seattle	2
Api platform companies in Minneapolis	2
Api platform companies in St. Petersburg	1
Api platform companies in Dublin	1
Api platform companies in Richmond	1

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “api platform companies”, with match quality audited by blind human judging, and headquartered in the United States.
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: Contact records re-verify on a rolling cadence; 16 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many api platform companies are there based in the United States?

There are 47 api platform companies headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

F5, headquartered in Seattle, tops this list with the largest team on record.

Which city has the most api platform companies?

San Francisco leads with 12 headquartered companies, followed by Boston (3) and Atlanta (2).

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 4,474 verified decision-maker contacts tracked across these 47 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.