Vector Databases APIs let you add vector databases capabilities without building from scratch. Every entry below is profiled with trust signals — pricing model, authentication requirements, CORS support, rate limits, and live uptime checks — so you can compare options and pick production-safe choices instead of guessing from a link list.
| API | Pricing | Auth | CORS | Health | |
|---|---|---|---|---|---|
| Upstash Vector API Serverless vector database API for embeddings, similarity search, and RAG. | Freemium | API Key | Yes | Profile | |
| Weaviate Cloud API Weaviate Cloud Services REST and GraphQL APIs for managed vector database clusters with hybrid search and generative modules. | Freemium | API Key | Yes | Profile | |
| Zilliz Cloud API Managed Milvus vector database REST APIs for clusters, collections, and vector data operations. | Freemium | API Key | No | Profile |
Start with pricing and auth: free tiers and no-auth APIs are fastest to prototype with. Then check CORS if your app calls the API from the browser, and health before you commit — a great API that's been down for a week will block your launch. Each profile below shows all of these signals plus rate limits where documented.