What's free
Starter plan: $5 one-time credit (no card) — embeddings (mxbai-embed-large-v1), reranking, and multimodal search over PDF/image/doc/code
Rate limits
Starter plan: 100 requests/min
The catch
Free credit is usage-based and non-renewing; usage-based pricing applies afterward. Native REST API, not documented as OpenAI-compatible. No card required.