If you're building an API-first company, finding an investor who understands your vision is essential. To help with your search, we've identified some of the top firms backing API startups today.
You'll find large firms like Insight Partners, with over 1,200 investments, and Bain Capital Ventures, which has backed over 700 companies. The firms vary in size and focus, offering a wide range of potential partners for your startup.
Below is our list of the best 14 API VC firms.
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Buy It For $97 $297 →As a global software investor, Insight Partners backs high-growth technology and software companies ready to enter their ScaleUp phase. Their hands-on operational support has helped build a portfolio that includes major players like Shopify and DocuSign.
| Headquarters | New York, New York, United States |
| Year Founded | 1995 |
| Founders | Jeff Horing, Jerry Murdock |
| Total Funding | $46.1B |
| Average Check Size | $20M |
| Industries | Crypto & Blockchain, Cybersecurity, Devops, E-Commerce, Education, Fintech, Government Technology, Healthcare, Supply Chain & Logistics, Proptech & Real Estate, Future of Work, AI & ML, API, Food & Beverage, Marketplace, Legal, Infrastructure |
| Investment Stage | Convertible Note, Debt, Early Stage, Late Stage, Private Equity, Seed, Series A, Growth |
| Nº of Investments | 1209 (786 as Lead Investor) |
| Nº of Exits | 263 (53 IPO'd) |
| Top Portfolio Startups | Twitter, Docusign, Shopify |
| Contact | growth@insightpartners.com / 212-230-9200 |
Basis Set Ventures backs early-stage enterprise startups using artificial intelligence to improve how people work. The firm provides seed and Series A funding for companies building scalable infrastructure, workflow automation, and autonomous machines.
| Headquarters | Menlo Park, California, United States |
| Year Founded | 2017 |
| Founders | Lan Xuezhao |
| Total Funding | $165M |
| Average Check Size | $3M |
| Industries | AI & ML, Automation, Developer Tools, Productivity, API |
| Investment Stage | Early Stage, Late Stage, Seed |
| Nº of Investments | 101 (18 as Lead Investor) |
| Nº of Exits | 8 |
| Top Portfolio Startups | Omni, Star Sharks, Dataro |
| Contact | info@basisset.ventures |
Bain Capital Ventures partners with founders from the earliest seed stage through IPO, focusing on companies in fintech, infrastructure, and application software. Its portfolio, which includes major successes like Docusign and LinkedIn, gains a distinct advantage from the deep industry expertise and resources of the broader Bain Capital platform.
| Headquarters | San Francisco, California, United States |
| Year Founded | 2000 |
| Founders | James Nahirny, Michael Krupka |
| Total Funding | $6.1B |
| Average Check Size | $100M |
| Industries | E-Commerce, Fintech, Biotech, Enterprise, Deep Tech & Hard Science, SaaS, Developer Tools, API, Infrastructure |
| Investment Stage | Early Stage, Late Stage, Seed |
| Nº of Investments | 718 (318 as Lead Investor) |
| Nº of Exits | 151 (16 IPO'd) |
| Top Portfolio Startups | Blockfi, Docusign, Rapid7 |
| Contact | bcv@baincapitalventures.com / 212-822-2900 |
Led by fellow entrepreneurs, Notion Capital provides early-stage funding to European B2B SaaS and cloud companies. The firm focuses on building strong relationships to help businesses like GoCardless and Paddle achieve massive scale.
| Headquarters | London, England, United Kingdom |
| Year Founded | 2009 |
| Founders | Ben White, Chris Tottman, Ian Milbourn, Jos White, Stephen Chandler |
| Total Funding | £275M |
| Average Check Size | £20M |
| Industries | SaaS, Cloud, Developer Tools, Devops, API, Deep Tech & Hard Science, AI & ML, Creator Economy, Fintech, InsurTech |
| Investment Stage | Early Stage, Seed |
| Nº of Investments | 260 (85 as Lead Investor) |
| Nº of Exits | 35 (1 IPO'd) |
| Top Portfolio Startups | Cledara, Stable, Cyscale |
| Contact | info@notion.vc / +44 8454989393 |
Hetz Ventures provides seed and early-stage funding to Israeli startups building deep tech, developer tools, and enterprise software. Backed by a network of European investors, they help portfolio companies like Anima and Blink access global markets.
| Headquarters | Tel Aviv, Tel Aviv, Israel |
| Year Founded | 2018 |
| Founders | Andrew Feldman, Judah Taub, Stuart Roden |
| Total Funding | $123M |
| Industries | API, Developer Tools, AI & ML, Enterprise, Deep Tech & Hard Science, Cybersecurity, Cloud |
| Investment Stage | Early Stage, Seed |
| Nº of Investments | 53 (25 as Lead Investor) |
| Nº of Exits | 8 |
| Top Portfolio Startups | Anima, Digma, Blink |
| Contact | contact@hetz.vc |
As a $50M Pan-African fund, Ingressive Capital invests in pre-seed and seed stage tech companies led by indigenous founders across the continent. They support startups that build for Africa's youth and increase the continent's value chain ownership, with a portfolio that includes successes like Paystack and Bamboo.
| Headquarters | Lagos, Lagos, Nigeria |
| Year Founded | 2017 |
| Founders | Maya Horgan Famodu |
| Total Funding | $10M |
| Average Check Size | $400k |
| Industries | Fintech, Devops, Transportation, Biotech, Supply Chain & Logistics, Proptech & Real Estate, API, Cloud, Automotive, Agriculture |
| Investment Stage | Early Stage, Seed, Pre-Seed |
| Nº of Investments | 58 (9 as Lead Investor) |
| Nº of Exits | 3 |
| Top Portfolio Startups | Paystack, Bamboo, 54gene |
| Contact | communications@ingressive.vc |
Matchstick Ventures champions early-stage tech companies in burgeoning but overlooked startup markets. They provide seed and early-stage funding to founders building in sectors like SaaS and Fintech, with a portfolio that includes companies such as Coherent and Honest Jobs.
| Headquarters | Boulder, Colorado, United States |
| Year Founded | 2015 |
| Founders | Natty Zola, Ryan Broshar |
| Total Funding | $90M |
| Average Check Size | $1.5M |
| Industries | API, Marketplace, Crypto & Blockchain, Supply Chain & Logistics, Fintech, Proptech & Real Estate, SaaS |
| Investment Stage | Convertible Note, Early Stage, Seed, Pre-Seed |
| Nº of Investments | 135 (20 as Lead Investor) |
| Nº of Exits | 18 |
| Top Portfolio Startups | Fivable, Coherent, Honest Jobs |
| Contact | ryan@matchstick.vc / (303) 919-6263 |
First Momentum Ventures backs early-stage B2B software startups across the DACH region with their first institutional investment. They support these ambitious teams with capital, world-class mentoring, and a strong network to help them gain crucial early momentum.
| Headquarters | Karlsruhe, Baden-Wurttemberg, Germany |
| Year Founded | 2017 |
| Founders | Alexander Kaiser, Andreas Fischer, Benedikt Stolz, Karl Lorey, Sebastian Bohmer |
| Total Funding | €250M |
| Average Check Size | €1M |
| Industries | Enterprise, AI & ML, Cloud, API, SaaS, Marketplace |
| Investment Stage | Early Stage, Seed, Pre-Seed |
| Nº of Investments | 54 (5 as Lead Investor) |
| Nº of Exits | 2 |
| Top Portfolio Startups | Stealth, TiloDB, EqualTo |
| Contact | founders@firstmomentum.vc / +49 15208407840 |
Core Innovation Capital backs early-stage startups that are rebuilding essential American systems like financial services, healthcare, and real estate. By focusing on these often-ignored sectors, they have helped launch successful companies like Nerdwallet, Oportun, and Ripple.
| Headquarters | Los Angeles, California, United States |
| Year Founded | 2009 |
| Founders | Arjan Schutte |
| Total Funding | $220M |
| Average Check Size | $10M |
| Industries | Consumer, API, Fintech, Healthcare, InsurTech, Proptech & Real Estate |
| Investment Stage | Early Stage, Seed |
| Nº of Investments | 104 (19 as Lead Investor) |
| Nº of Exits | 21 (3 IPO'd) |
| Top Portfolio Startups | Nerdwallet, Oportun, Ripple |
| Contact | info@corevc.com / 917 558 3978 |
Tidal Ventures invests in seed and early-stage technology companies with global appeal, particularly those in enterprise SaaS and cybersecurity that are set to disrupt their industries. Their team of former startup operators provides hands-on guidance to portfolio companies like Checkbox and Shippit, helping them navigate growth and secure future funding.
| Headquarters | Sydney, New South Wales, Australia |
| Year Founded | 2016 |
| Founders | Andrea Kowalski, Grant McCarthy, Murray Bleach, Wendell Keuneman |
| Total Funding | $40M |
| Average Check Size | $5M |
| Industries | Enterprise, SaaS, API, Cybersecurity |
| Investment Stage | Early Stage, Late Stage, Seed |
| Nº of Investments | 52 (31 as Lead Investor) |
| Nº of Exits | 4 (1 IPO'd) |
| Top Portfolio Startups | Checkbox, TheLoops, Shippit |
4 Additional API VC Firms Worth Pitching
Our top picks are a great place to start, but the funding for API-first companies doesn't stop with them. Other VCs from the US to Europe have collectively backed nearly 300 startups. Together, they have also guided over 30 of those companies to successful exits. Here’s a look at more venture capital firms funding what's next in the API space.