Vector Databases APIs let you add vector databases-powered 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 | |
|---|---|---|---|---|---|
| Chroma API Open-source embedding store; simplest start for local RAG prototypes. | Unknown | Unknown | Yes | Profile | |
| DataStax Astra DB API Serverless Cassandra with vector search for global RAG apps. | Unknown | Unknown | Yes | Profile | |
| Elasticsearch Vector Search Search plus kNN dense-vector retrieval in one engine. | Unknown | Unknown | Yes | Profile | |
| LanceDB Cloud Multimodal lakehouse vector store, embedded or cloud. | Unknown | Unknown | Yes | Profile | |
| Marqo Cloud API End-to-end vector search cloud with built-in embedding and chunking. | Unknown | Unknown | Yes | Profile | |
| Milvus Vector Database Open-source billion-scale vector database, managed via Zilliz Cloud. | Unknown | Unknown | Yes | Profile | |
| MongoDB Atlas Vector Search Vector search built into MongoDB Atlas alongside operational data. | Unknown | Unknown | Yes | Profile | |
| OpenSearch Vector Search Open-source search and kNN vector retrieval. | Unknown | Unknown | Yes | Profile | |
| Pinecone API Fully managed serverless vector database for production RAG. | Unknown | Unknown | Yes | Profile | |
| Qdrant Cloud API Rust vector engine with best-in-class filtering, self-hosted or cloud. | Unknown | Unknown | Yes | Profile | |
| Redis Vector Search Sub-millisecond vector search inside Redis for small-to-mid datasets. | Unknown | Unknown | Yes | Profile | |
| Turbopuffer API Fast serverless vector database with a developer-first API. | Unknown | Unknown | Yes | Profile | |
| Upstash Vector API Serverless vector database API for embeddings, similarity search, and RAG. | Freemium | API Key | Yes | Profile | |
| Vespa Search API Big-data serving engine for search, vectors and recommendations. | Unknown | Unknown | 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 vector databases 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.