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API 131 startups

"API" Startups

Every active startup we index tagged "API", sorted by score and momentum.

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Last updated

2026-09-02

Hiring right now 10% 13 of 131

Open roles 329

Most-hired discipline Engineering

131 tech startups tagged "API" are currently indexed on techstartupslist.com. This page lists every active match, with logos, taglines, and direct links to each company's site — no paywalled middleman. Notable "API" startups in the index include Alpaca, AssemblyAI, Checkr, Deepgram, and Gigs. Each profile surfaces team size, founding year, category, and any open roles their careers page is publicly scrapable for. These companies concentrate in AI / ML, Dev Tools, and Fintech — the categories where this tag shows up most often in our scrape. Geographically, "API" lean toward San Francisco, New York City, and London, with the rest spread across remote-first teams and other hubs. Y Combinator batches represented here: W23, S22, W22, and S23, among others. 10% of these companies are hiring right now (13 of 131) — a live signal from the jobs we scrape, not a static directory claim; 7 are currently flagged as trending on hiring momentum; the listing refreshes whenever the scrape runs so tag membership stays current as companies re-tag and new ones appear.

API-first stock and crypto brokerage platform

Developer ToolsFintechAPI

The best way to build Voice AI apps

Artificial IntelligenceDeveloper ToolsSpeech Recognition

People infrastructure for the future of work

Artificial IntelligenceComplianceHR Tech

Building foundational AI for speech transcription and understanding.

AI-Enhanced LearningAPIAI

The OS for Embedded Telecom

FintechHR TechAPI

A single API for all your integrations

Developer ToolsSaaSOpen Source

Power commerce photography with generative AI

Generative AIComputer VisionDesign Tools

Agent simulation and RL for researchers

AIOpsArtificial IntelligenceAPI

Email Inboxes for AI Agents

Developer ToolsAPIEmail

Phone Numbers for AI Agents

Artificial IntelligenceDeveloper ToolsAPI

Developer-friendly and enterprise-grade APIs for financial market…

Developer ToolsSaaSAnalytics

Protecting Humans from Scams

FintechSaaSCrypto / Web3

One API to get clean data from any website for your AI agents at scale

Artificial IntelligenceDeveloper ToolsAPI

Embedded finance platform for African businesses

Banking as a ServiceFintechPayments

AI Search for the Next Generation

Generative AIConsumerAPI

API sandboxes, built for AI agents

Artificial IntelligenceDeveloper ToolsAPI

The world’s largest omnichannel communications platform

Stablecoin API for global payments

Developer ToolsFintechCrypto / Web3

The world's data, ready for AI

Leading open-source web agent project with 50k stars in 3 months

Artificial IntelligenceOpen SourceAPI

Buró de Ingresos

The Work Number for LatAm

Accurate, high-performance retrieval for AI agents

B2BAPIData Engineering

iMessage infrastructure for business

Artificial IntelligenceSaaSAPI

Research services for ChatGPT and Claude

Artificial IntelligenceAPIInfrastructure

Demo Platform for API-First Companies

Cosmic is an AI-powered headless CMS

Developer ToolsAPI

Bare-metal access to Brazil's Open Finance and Pix systems

API Platform for Banking Integrations (Plaid for India and APAC)

Banking as a ServiceFintechAPI

Prevent Fraud and Onboard Users Faster

SaaSB2BIdentity

Developer friendly drop in payouts infrastructure

FintechPaymentsAPI

Make your LLMs 3x faster.

Artificial IntelligenceDeveloper ToolsSaaS

The essential platform for modern medical practices and patients.

HealthcareTelemedicineAPI

The complete toolkit to sell travel.

AirplanesB2BTravel

Real-time audio & video SDKs, ready to launch 🚀

VideoAPITelecommunications

A single point integration for secure and automated EV charging.

Artificial IntelligenceAPIEnergy

Energy Orchestration Platform

ClimateAPIEnergy

Offensive security for the teams that are 100x outnumbered

Developer ToolsSecurityAPI

Real-time speech translation

Generative AIAPITelecommunications

Webflow for the Backend

Developer ToolsB2BAPI

Instantly offer SDKs and API Docs

Developer ToolsSaaSB2B

Finch is the Employment Data Platform

FintechHR TechAPI

No-code workflow tool

B2BCustomer SuccessCompliance

Crypto Deposits, Wallet Funding, and Pay-with-crypto Infra

Developer ToolsCrypto / Web3B2B

AI estimator & agent for remodelers.

Machine LearningConstructionB2B

Global Card Issuing and Payment Processing Engine

FintechPaymentsB2B

API for shared embeddable web browsers

Developer ToolseLearningVirtual Reality

Build chat-with-data agents for customer-facing applications

Artificial IntelligenceDeveloper ToolsAnalytics

Generate fast, reliable APIs for any platform

Developer ToolsB2BAPI

Showing 48 of 131 Filter the directory by this tag →

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2 of 4 similar companies are hiring right now · most common: Engineering

A complete DevOps platform delivered as a single application.

Developer ToolsDevSecOpsOpen Source

Email for developers

EmailDeveloper InfrastructureSaaS

The fastest way to build an AI agent

Artificial IntelligenceAnalyticsMarketing

Digital payments for businesses in Pakistan

Developer ToolsFintech

YC W23 startupsAll cohort members Startups in San Francisco2567 indexed AI / ML startupsFull category listing

"API" startups in San Francisco63 startups "API" startups in New York City12 startups "API" startups in London5 startups

Frequently asked questions

How many "API" startups are indexed?

Our index currently tracks 131 active tech startups tagged "API". New entries appear automatically as scrapers discover them; shutdowns are flagged inactive and drop off this listing.

What are the top "API" startups?

Among the "API" startups indexed here: Alpaca, AssemblyAI, and Checkr, plus 128 more on this page. Sorting prioritizes curated score, sponsored placements, and trending signals.

Are "API" startups hiring right now?

13 of the 131 companies on this page currently have open roles in our jobs index. Open roles link straight to each company's own careers page.

How often is the "API" startup list updated?

Automated scrapers refresh this page on the same daily cadence as the rest of the directory. The last index update was 2026-09-02.