Free if: NVIDIA Developer Program API key; free to prototype, rate-limited
To start: $0 · accountNVIDIA Developer Program account and an nvapi- key ("for API testing use only", valid 1 year); free tier is rate-limited (about 40 requests/min for most models)
Tested with a new NVIDIA build key: the key works (Nemotron 3 Super answered in 0.6 s) but GLM 5.3, Kimi K3 and DeepSeek V4.1 Flash returned nothing within 150–180 s, apparently queued on the free endpoints