API

Apigee is Google Cloud's API management platform that helps organizations design, secure, publish, and analyze APIs at scale.

Kong describes itself as "The AI Connectivity Company," providing the connectivity layer for the agentic era — securely connecting, governing, and monetizing APIs and AI tokens across any model or cloud, via products like Kong Gateway and Kong Konnect.

Plaid calls itself "the world's largest financial data network," enabling companies to connect to financial institutions and build fintech solutions on top of verified account and transaction data.

RapidAPI (per its own documentation) is "the world's largest API hub," used by millions of developers to discover, test, and connect to thousands of third-party APIs using a single API key, while also letting API providers distribute and monetize their APIs.

SendGrid, now operated under Twilio's platform, is an email API and SMTP service providing email solutions for transactional email at scale and marketing email campaigns.

Stripe describes itself as "financial infrastructure to grow your revenue," letting businesses accept payments, offer financial services, and implement custom revenue models — from your first transaction to your billionth.

Twilio positions itself as "the platform for conversations in the AI era," providing programmable communications APIs (messaging, voice, email via SendGrid, video, authentication) that let companies build customer conversations across channels.