Databases and backends for AI agents
12 APIs compared on price, free tier, MCP support and real usage. Prices from the vendors' pricing pages, checked Oct 9, 2026.
| API | Free | Price | SDK downloads / wk | GitHub stars | MCP |
|---|---|---|---|---|---|
| Firebase Backend platform with database, authentication, hosting, and serverless functions. |
Spark plan with generous no-cost limits (1... | Free plan then Varies by service (e.g., $0.20/GiB bandwidth, $0.10/GB... |
— | — | |
| MongoDB Atlas Fully-managed cloud database platform for storing and querying data. |
512MB storage, shared RAM and vCPU, up to... | Free plan · paid from $9/mo | — | — | |
| Upstash Redis Managed Redis database with global replication and vector search capabilities. |
250 MB data, 500K commands/month | Free plan · paid from $10/mo | — | — | |
| Neon Managed Postgres database with autoscaling compute, storage, and backend services. |
1 GB storage, 100 CU-hours compute/month per... | Free plan then $0.106 per CU-hr (Launch), $0.222 per CU-hr (Scale);... |
— | — | MCP |
| Redis In-memory data store for caching, sessions, and real-time analytics. |
Up to 30 MB | Free plan · paid from $5/mo | — | — | |
| AuraDB Fully-managed graph database platform for storing and querying connected data. |
Free plan with limits on node and relationship counts | Free plan then $0.09/GB/hour (Professional), $0.20/GB/hour (Business Critical) |
— | — | |
| SingleStore Cloud relational database with SQL, vector search, and real-time analytics capabilities. |
1 Free Workspace for evaluation and... | Free plan then $0.99/hr for Standard edition compute, $3.96 per credit,... |
— | — | |
| Convex Reactive database and backend platform with functions, file storage, and vector search. |
1M function calls, 0.5GB database storage,... | Free plan · paid from $25/mo | — | — | |
| Sanity Hosted content database with real-time editing, APIs, and AI-powered content agent. |
20 seats, 2 datasets, 10k documents, 250k... | Free plan · paid from $15/mo | — | — | MCP |
| Electric Cloud Real-time data synchronization platform charging for writes and data retention. |
Reads, egress, and fan-out free; under... | Free plan · paid from $249/mo | — | — | |
| Prisma Database management and ORM with Postgres and serverless compute. |
1M requests/month, 200k operations/month,... | Free plan · paid from $10/mo | — | — | |
| Appwrite Backend platform for building, deploying, securing, and observing applications. |
Free plan with resource limits | Free plan · paid from $10/mo | — | — |
Other categories
Web search APIs Scraping and crawling Browser automation (cloud) Code sandboxes Memory for agents Vector databases LLM gateways and routers Email sending Voice (speech-to-text, text-to-speech) Payments for agents Blockchain RPC and node providers DEX swap and liquidity APIs Crypto market and on-chain data 3D model generation Image generation APIs Sound effects and music generation Video generation APIs Model hosting and inference Embeddings and rerank Document parsing and OCR LLM observability and evals Error tracking and analytics Auth and user accounts File storage and media CDN Hosting and deployment SMS, chat and notifications Integrations and automation Business apps with APIs Maps and location Wallets, tokens and NFTs