58 API Companies
That Have Shown strong growth metrics
Track api companies demonstrating significant growth across key metrics in real-time.
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58 companies, each with its dated signal
Get 9 rows free · Fast Growing API Companies
The list's first rows in Excel, with every column the full file has and how full each one is. One e-mail, then at most two short notes.
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This page lists 58 api companies that have shown strong growth metrics recently. Each company detected a fast growing signal through Bounce Watch's real-time monitoring system that tracks 40+ growth and risk indicators across thousands of companies.
Postman
San Francisco, United States (2014)
Postman is the world's leading API platform trusted by 40 million users.
Kong
San Francisco, United States (2017)
The AI Connectivity Company
Checkr, Inc.
San Francisco, United States (2014)
Checkr is the AI verification platform for high-stakes decisions.
Unit21
San Francisco, United States (2018)
The leader in AI Risk Infrastructure for fraud & AML.
Finqware
Romania (2018)
We put Open Banking at Work® for real-time enterprise finance across Europe.
transferz
The Netherlands (2020)
Powering seamless pre-booked airport transfers, globally!
emnify
Berlin, Germany (2014)
IoT connectivity with instant control.
OpenHealth Technologies
Berlin, Germany (2023)
The medical data intelligence infrastructure for health insurers, hospitals, and labs.
Civo
London, United Kingdom (2015)
Built for more. More control. More power. More possibilities.
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Vonage
Holmdel, United States (2001)
Communications APIs. Unified Communications. Contact Centers. Now we're talking.
Salesforce
San Francisco, United States (1999)
We're the #1 AI CRM—where humans with agents drive customer success together.
Plivo
Austin, United States (2011)
AI agents to engage and delight your customers across Phone calls, Chat, WhatsApp, SMS, Email and Slack.
Belvo
Spain (2019)
Powering the next generation of financial innovators in Latin America.
Privy
United States (2021)
Powering crypto and stablecoin payments with powerful wallet infrastructure serving 100M+ accounts & bill...
SmartBear
Somerville, United States (2009)
Helping teams build, test, and ship quality software at AI speed and scale.
Flinks
Toronto, Canada (2016)
The embedded finance platform for connectivity, intelligence, and payments.
LangChain
San Francisco, United States (2022)
LangChain is a large language model application development library
RevenueCat
Brandon, United States (2017)
The world's best apps use RevenueCat to power purchases, manage customer data, and grow revenue on iOS, A...
Alpaca
San Mateo, United States (2017)
Developer APIs for stocks, options and crypto trading, investing apps, and embedded fintech.
Mockoon
Luxembourg (2017)
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account requir...
Finch
San Francisco, United States (2020)
The #1 Unified API for Employment Systems
Speedscale
Atlanta, United States (2020)
Stress test your APIs with real world scenarios. Collect and replay traffic without scripting.
On-us
Hong Kong S.a.r. (2019)
FinTech Enabled, Data Unlocked.
Flanks
Spain (2019)
Redefining the wealth management industry worldwide
Parasoft
Monrovia, United States (1987)
Automated Software Testing
NextPax
The Netherlands (2006)
The most advanced channel management technology provider for hotels, resorts and vacation rentals worldwi...
Tyk
London, United Kingdom (2015)
Open Source #API gateway & #APImanagement platform. We're on a mission to connect every system in the wor...
Cloudprinter.com
The Netherlands (2015)
The global print platform connecting businesses to print in 104 countries, while helping print houses fil...
Combidesk | Koppel Jouw Software
The Netherlands (2014)
Smart Software Integrations (API / iPaaS)
Deepgram
San Francisco, United States (2015)
Powering the Voice AI economy—trusted by 200,000+ developers to build low-latency, enterprise-grade Voice...
DevRev
Palo Alto, United States (2020)
We built Computer, the only AI with native “shared memory”. So you get answers & actions you can really t...
Restb.ai
Spain (2015)
Computer Vision For Real Estate.
Uniblock
San Francisco, United States (2022)
Manage APIs with unmatched scale, security, and performance.
Spade
New York, United States (2021)
Enriched transaction data you can build on.
People Data Labs
San Francisco, United States (2015)
People and Company Intelligence
Apollo GraphQL
San Francisco, United States (2016)
API orchestration for AI Agents, web, and mobile apps w/GraphQL. API connectivity with enterprise-proven...
Tealium
San Diego, United States (2011)
We deliver trusted data for AI at enterprise scale
Salt Security
Palo Alto, United States (2018)
Securing the Agentic AI action layer: protecting the APIs, MCP servers, and agents powering modern digita...
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Terminal (YC S23)
Toronto, Canada (2023)
Universal API for Telematics Data | Y Combinator
Unified (TS S23)
Toronto, Canada (2023)
One API, 350+ Integrations across 21 B2B verticals — The #1 real-time unified API+MCP for AI applications
vivenu
Dusseldorf, Germany (2018)
vivenu is the most flexible and advanced ticketing platform. It elevates your brand, your sales, and busi...
LlamaIndex
San Francisco, United States (2023)
AI agents for document OCR + workflows
Apideck
San Francisco, United States (2020)
Apideck enables developers to build integrations through a single API.
Stream
Boulder, United States (2015)
Stream powers Chat, AI Moderation, Activity Feeds, Video & Audio for billions of global end-users.
Easebuzz
Pune, India (2014)
Payment Solutions Platform
DDD Invoices - One API, global invoicing compliance
London, United Kingdom (2023)
The fastest & simplest way to tax-compliant invoicing - trusted by leading software providers.
CEQUENS
United Arab Emirates (2011)
Simple Solutions, Deeper Connections
Valcon
The Netherlands (2000)
Valcon is a European powerhouse in AI & data-driven business transformation, integrating consulting, tech...
Open Payments
Sweden (2017)
Simplifying B2B payments
Focus NFe
Curitiba, Brazil (2005)
Invista tempo em sua empresa e deixe as notas fiscais com o Focus NFe.
Sieve
San Francisco, United States (2022)
Video datasets for frontier AI.
DataQueue
The Netherlands (2022)
Leading the most efficient tools for voice AI
AssemblyAI
San Francisco, United States (2017)
Industry-leading Speech AI models to automatically recognize and understand speech.
Retell AI
San Carlos, United States (2023)
Supercharge your call operation with Retell.
Strapi
San Francisco, United States (2016)
Strapi is the leading open-source headless CMS. It’s 100% JavaScript, fully customizable and developer-fi...
Eden AI
France (2021)
AI made easy for Developers
Root
London, United Kingdom (2016)
The proven API-first insurance platform to build, launch and manage digital insurance products
Deskree
Toronto, Canada (2022)
Giving AI context about your system.
What changed at these API companies recently?
We recorded 350 changes here in the last 180 days, including 198 product launches, 66 traction updates, 51 awards, 18 expansion moves and 7 hiring moves. Each entry below carries the date we observed it, from public sources.
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Kong
— New Product Launched
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SmartBear
— New Feature Launched
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Speedscale
— New Feature Launched
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Postman
— New Product Launched
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DataQueue
— New Feature Launched
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Vonage
— Award Received
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Parasoft
— New Feature Launched
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Checkr, Inc.
— Made Acquisition
