📦 Upstash

Upstash offers three serverless data products: Redis (for caching, sessions, and rate limiting), QStash (HTTP-based message queue with guaranteed delivery), and Vector (serverless vector database for RAG pipelines). All are priced per request with no always-on server cost.

• Serverless Redis: per-request pricing, global replication, REST API
• QStash: HTTP message queue with at-least-once delivery and deduplication
• Vector DB: serverless vector store for RAG and semantic search pipelines
• Rate limiting helpers for Next.js middleware and API routes
• Free tier covers generous request limits across all three products