Frequently asked questions
Everything you might want to know about QuickSilver Pro — the OpenAI-compatible inference API for DeepSeek V3, R1, and Qwen3.5-35B-A3B.
Common questions
What is QuickSilver Pro?
An OpenAI-compatible HTTP API for the top open-source LLMs — DeepSeek V3, DeepSeek R1, and Qwen3.5-35B-A3B. Point the official OpenAI SDK at our base URL and get the same chat-completions interface, 20% below competing resellers.
Which models do you support?
DeepSeek V3 (general chat, coding, strict JSON), DeepSeek R1 (reasoning, math, logic), and Qwen3.5-35B-A3B (3B active MoE, 262K context, long-document RAG). All three are fully open-source and the three most popular open-source models on OpenRouter.
How much cheaper than OpenRouter / OpenAI?
20% below the public per-token rates at OpenRouter, Together AI, Fireworks AI, and DeepInfra on the same open-source models. DeepSeek V3: $0.24 input / $0.70 output per 1M tokens. DeepSeek R1: $0.40 / $1.70. Qwen3.5-35B-A3B: $0.13 / $1.00. We don't serve closed models (GPT-4, Claude). See the calculator to estimate your workload, or side-by-side comparisons.
Is it really a drop-in OpenAI replacement?
Yes. Change base_url to https://api.quicksilverpro.io/v1 in the official openai Python / Node / Swift SDKs. Streaming, tool calling, json_schema strict mode, and usage.cost accounting all work out of the box. See Quick Start for ready-to-paste snippets.
Does it work with Aider, Cline, Cursor, LangChain, and the Vercel AI SDK?
Yes — any tool that accepts a custom OpenAI base URL works: Aider, Cline, Cursor, Continue, LangChain, LlamaIndex, and the Vercel AI SDK (via @ai-sdk/openai-compatible). Point at https://api.quicksilverpro.io/v1 with your QSP API key.
How do I migrate from OpenRouter?
Two lines. Change base_url from openrouter.ai/api/v1 to api.quicksilverpro.io/v1, and swap your API key. Model IDs drop the provider prefix: deepseek/deepseek-chat → deepseek-v3, deepseek/deepseek-r1 → deepseek-r1, qwen/qwen3.5-35b-a3b → qwen3.5-35b. Full walkthrough: /migrate/from-openrouter.
Is there a free tier?
New accounts get $1 in free credits on registration — enough for ~500-700 real DeepSeek V3 calls to evaluate the service. After that it's pay-as-you-go starting at $5, no subscription.
Can I try without signing up?
Yes. We host a free Gradio demo on Hugging Face Spaces — chat with DeepSeek V3, DeepSeek R1, and Qwen3.5-35B-A3B directly in the browser, no account or API key required. Rate-limited per session so it stays responsive for everyone.
Who operates QuickSilver Pro?
QuickSilver Pro is a product of MachineFi Inc. (Delaware C-corp, Menlo Park, California), built by MachineFi Labs. We're building inference infrastructure for open-source AI — see the roadmap (own H100/H200 GPUs with SGLang + EAGLE-3 + FP8).
Still have questions?
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