API key

API key listings in API Building Blocks, curated by API Cut.

8 listings

Category
Pricing model
Free tier(5)Open source(1)

Showing 8 of 8 listings

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Algolia Search API

A hosted search and discovery API for indexing records, running keyword and AI-assisted search, configuring ranking, filtering results, and adding recommendations and personalization.

UI & Experiences
Freemium
API key
✓Yes—No
ElevenLabs API

A voice and audio API for text to speech, speech to text, conversational voice agents, dubbing, sound effects, voice transformation, and audio processing.

Voice & Audio
Freemium
API key
✓Yes—No
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
Inngest API

A durable execution and workflow API for event-driven functions, background jobs, queues, retries, concurrency, throttling, scheduling, and workflow observability.

Automation & Orchestration
Freemium
API key
✓Yes✓Yes
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
Pinecone API

A managed vector database and inference API for storing and searching records, generating embeddings, reranking results, and building retrieval and knowledge applications.

Data & Knowledge
Freemium
API key
✓Yes—No
Resend API

An email API for sending and receiving transactional email, managing domains, contacts, broadcasts, templates, webhooks, and delivery events.

Chat & Messaging
Freemium
API key
✓Yes—No
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