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Top 14 API Venture Capital Firms (2026)

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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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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.

HeadquartersNew York, New York, United States
Year Founded1995
FoundersJeff Horing, Jerry Murdock
Total Funding$46.1B
Average Check Size$20M
IndustriesCrypto & 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 StageConvertible Note, Debt, Early Stage, Late Stage, Private Equity, Seed, Series A, Growth
Nº of Investments1209 (786 as Lead Investor)
Nº of Exits263 (53 IPO'd)
Top Portfolio StartupsTwitter, Docusign, Shopify
Contactgrowth@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.

HeadquartersMenlo Park, California, United States
Year Founded2017
FoundersLan Xuezhao
Total Funding$165M
Average Check Size$3M
IndustriesAI & ML, Automation, Developer Tools, Productivity, API
Investment StageEarly Stage, Late Stage, Seed
Nº of Investments101 (18 as Lead Investor)
Nº of Exits8
Top Portfolio StartupsOmni, Star Sharks, Dataro
Contactinfo@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.

HeadquartersSan Francisco, California, United States
Year Founded2000
FoundersJames Nahirny, Michael Krupka
Total Funding$6.1B
Average Check Size$100M
IndustriesE-Commerce, Fintech, Biotech, Enterprise, Deep Tech & Hard Science, SaaS, Developer Tools, API, Infrastructure
Investment StageEarly Stage, Late Stage, Seed
Nº of Investments718 (318 as Lead Investor)
Nº of Exits151 (16 IPO'd)
Top Portfolio StartupsBlockfi, Docusign, Rapid7
Contactbcv@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.

HeadquartersLondon, England, United Kingdom
Year Founded2009
FoundersBen White, Chris Tottman, Ian Milbourn, Jos White, Stephen Chandler
Total Funding£275M
Average Check Size£20M
IndustriesSaaS, Cloud, Developer Tools, Devops, API, Deep Tech & Hard Science, AI & ML, Creator Economy, Fintech, InsurTech
Investment StageEarly Stage, Seed
Nº of Investments260 (85 as Lead Investor)
Nº of Exits35 (1 IPO'd)
Top Portfolio StartupsCledara, Stable, Cyscale
Contactinfo@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.

HeadquartersTel Aviv, Tel Aviv, Israel
Year Founded2018
FoundersAndrew Feldman, Judah Taub, Stuart Roden
Total Funding$123M
IndustriesAPI, Developer Tools, AI & ML, Enterprise, Deep Tech & Hard Science, Cybersecurity, Cloud
Investment StageEarly Stage, Seed
Nº of Investments53 (25 as Lead Investor)
Nº of Exits8
Top Portfolio StartupsAnima, Digma, Blink
Contactcontact@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.

HeadquartersLagos, Lagos, Nigeria
Year Founded2017
FoundersMaya Horgan Famodu
Total Funding$10M
Average Check Size$400k
IndustriesFintech, Devops, Transportation, Biotech, Supply Chain & Logistics, Proptech & Real Estate, API, Cloud, Automotive, Agriculture
Investment StageEarly Stage, Seed, Pre-Seed
Nº of Investments58 (9 as Lead Investor)
Nº of Exits3
Top Portfolio StartupsPaystack, Bamboo, 54gene
Contactcommunications@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.

HeadquartersBoulder, Colorado, United States
Year Founded2015
FoundersNatty Zola, Ryan Broshar
Total Funding$90M
Average Check Size$1.5M
IndustriesAPI, Marketplace, Crypto & Blockchain, Supply Chain & Logistics, Fintech, Proptech & Real Estate, SaaS
Investment StageConvertible Note, Early Stage, Seed, Pre-Seed
Nº of Investments135 (20 as Lead Investor)
Nº of Exits18
Top Portfolio StartupsFivable, Coherent, Honest Jobs
Contactryan@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.

HeadquartersKarlsruhe, Baden-Wurttemberg, Germany
Year Founded2017
FoundersAlexander Kaiser, Andreas Fischer, Benedikt Stolz, Karl Lorey, Sebastian Bohmer
Total Funding€250M
Average Check Size€1M
IndustriesEnterprise, AI & ML, Cloud, API, SaaS, Marketplace
Investment StageEarly Stage, Seed, Pre-Seed
Nº of Investments54 (5 as Lead Investor)
Nº of Exits2
Top Portfolio StartupsStealth, TiloDB, EqualTo
Contactfounders@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.

HeadquartersLos Angeles, California, United States
Year Founded2009
FoundersArjan Schutte
Total Funding$220M
Average Check Size$10M
IndustriesConsumer, API, Fintech, Healthcare, InsurTech, Proptech & Real Estate
Investment StageEarly Stage, Seed
Nº of Investments104 (19 as Lead Investor)
Nº of Exits21 (3 IPO'd)
Top Portfolio StartupsNerdwallet, Oportun, Ripple
Contactinfo@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.

HeadquartersSydney, New South Wales, Australia
Year Founded2016
FoundersAndrea Kowalski, Grant McCarthy, Murray Bleach, Wendell Keuneman
Total Funding$40M
Average Check Size$5M
IndustriesEnterprise, SaaS, API, Cybersecurity
Investment StageEarly Stage, Late Stage, Seed
Nº of Investments52 (31 as Lead Investor)
Nº of Exits4 (1 IPO'd)
Top Portfolio StartupsCheckbox, 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.

VC FirmCountryYear FoundedNº InvestmentsNº Exits
Luminar Ventures logo Luminar VenturesSweden2017592
Kibo Ventures logo Kibo VenturesSpain201212221
Bedrock logo BedrockUnited States2017683
Fidelity International Strategic Ventures logo Fidelity International Strategic VenturesUnited Kingdom2018335

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