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Usage-based listings in API Building Blocks, curated by API Cut.

3 listings

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Authentication
Free tier(0)Open source(0)

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HeyGen API
HeyGen API

A video generation API for creating avatar videos, translating and dubbing video, generating speech, producing videos from templates, and working with avatar, voice, and template libraries.

Video & Avatars
Usage-based
API key
—No—No
OpenAI API
OpenAI API

A model API for building text, reasoning, multimodal, realtime, image, audio, and agentic applications through hosted models and tools.

Models & Agents
Usage-based
API key
—No—No
Stripe API
Stripe API

A payments and financial infrastructure API for accepting payments, managing subscriptions, sending payouts, running platforms and marketplaces, and automating revenue workflows.

Payments & Commerce
Usage-based
API key
—No—No