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Terms — the short version

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reasoning, math, o1-equivalent

general chat, coding, tool calling

262K long-context, RAG

Start with $1 in free credits and the official OpenAI SDK.

Lower list price across DeepSeek V3 and R1. DeepInfra's cache discount may change the math for cache-heavy prompts.

QuickSilver Pro vs DeepInfra

~20% cheaper on V3, ~79% cheaper on R1 output. OpenAI-compatible surface, same tool-calling semantics.

QuickSilver Pro vs Fireworks AI

20% cheaper on DeepSeek V3, R1, and Qwen3.5-35B-A3B at the per-token level. Same OpenAI-compatible API, two-line migration.

QuickSilver Pro vs OpenRouter

~76% cheaper on DeepSeek R1 output. Largest gap among resellers for reasoning-heavy workloads.

QuickSilver Pro vs Together AI

Head-to-head pricing comparisons for QuickSilver Pro vs the competing OpenAI-compatible inference providers, plus per-model use-case guides with quickstart code.

Compare & Use — QuickSilver Pro

Compare & Use

Math, algorithms, multi-step planning. Open-source o1 alternative at 35x less.

Code generation, refactoring, tool-calling agents. $0.24 / $0.70 per 1M tokens.

262K context, 3B active MoE. RAG and long-document summarization at $0.13 input.

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Paste your API key, or recover access via email.

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We'll email you a magic link to finish sign-up. {amount} free credits included.

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Credits never expire. Pay only for what you use.

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Top open-source models at 20% below market.

Models

Paste these three values wherever your agent / CLI / IDE asks for an "OpenAI-compatible endpoint". Keep your key secret.

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Copy this command, paste into your terminal. Costs about

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Your account activity and usage at a glance.

Overview

Spend and requests across models.

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Everything you might want to know about QuickSilver Pro — the OpenAI-compatible inference API for DeepSeek V3, R1, and Qwen3.5-35B-A3B.

FAQ — QuickSilver Pro

Frequently asked questions

Plug in your monthly usage — see the cost on QSP vs every competitor.

How much would you save?

output with stable exit codes — Claude Code, Cursor, Aider can call it without parsing HTML.

Create an account, buy credits, get your API key in 30 seconds.

Start saving on inference today

Common questions

The most popular open-source models — DeepSeek V3, DeepSeek R1, Qwen3.5-35B-A3B — through an OpenAI-compatible API. Cheaper than every other reseller. Change one line of code.

20% below the rest.

Open-source inference,

A transitional tactic so customers save 20% today. We maintain live benchmarks of every major open-source inference provider and dispatch each request to the cheapest healthy backend at that instant. Focus on only three models keeps the route table hot and cheap to maintain — savings flow to the customer.

Today: bridge phase while our GPU capacity comes online

We're building a self-hosted serving layer on H100/H200 using SGLang + continuous batching, EAGLE-3 speculative decoding, FP8 quantization via DeepGEMM, and SageAttention / ThunderMLA custom kernels. Target: another 30-50% below current prices on DeepSeek V3.

Next: our own inference stack on dedicated GPUs

Weights are public — we can actually run and optimize them. Closed models (GPT-4, Claude) don't expose weights, so no amount of infra work makes them cheaper. That's why our catalog is three open models we can verify, route, and eventually host ourselves.

Why open-source is the only way there

Per million tokens · compared against OpenRouter, Together AI, Fireworks.

Cheapest open-source inference

DeepSeek V3 for tool-calling agents →

Qwen3.5-35B-A3B for 262K RAG →

DeepSeek R1 for math & algorithms →

vs DeepInfra

vs Fireworks

vs OpenAI

vs OpenRouter

vs Together AI

OpenAI-compatible API for DeepSeek V3, R1, and Qwen3.5-35B-A3B — 20% cheaper than OpenRouter, Together AI, Fireworks. One-line drop-in. $1 free.

DeepSeek V3, R1, Qwen API · 20% cheaper · QuickSilver Pro

The Controller determines the purposes and means of processing Personal Data submitted to the service. The Processor processes that Personal Data solely on documented instructions from the Controller (via API request parameters) and only to provide the service.

Data subjects: end-users of the Controller's application whose inputs are submitted to the API. Categories: content of prompts and completions (which may contain any Personal Data the Controller chooses to send), account metadata, and usage metadata. Duration: for the term of the service agreement.

Process Personal Data only on Controller's instructions, unless required by law (in which case the Processor will notify the Controller first where legally permitted).

Impose confidentiality obligations on personnel authorized to process Personal Data.

Implement the technical and organizational measures described in Section 6.

Not train machine-learning models on Controller Personal Data.

Assist the Controller with data subject requests and regulatory investigations, at the Controller's reasonable cost for non-routine requests.

The Controller authorizes the Processor to engage the sub-processors listed on our Privacy Policy. We will give at least 30 days' notice (by email or dashboard) before adding or replacing a sub-processor. If the Controller reasonably objects, the Controller may terminate and receive a pro-rata refund of prepaid unused fees.

Personal Data may be processed in the United States. For transfers originating in the EEA, UK, or Switzerland, the parties rely on the EU Standard Contractual Clauses (Module Two, Controller-to-Processor) and the UK International Data Transfer Addendum, which are incorporated by reference upon execution of the enterprise DPA.

TLS 1.2+ for data in transit; HSTS enforced.

API keys stored as SHA-256 hashes; shown in cleartext only once at creation.

Webhook signatures verified with HMAC-SHA256 and timestamp freshness window.

Prompt and completion content not persisted to our storage (held in memory only during request processing).

Access to production systems restricted to authorized personnel, with logs retained for investigation.

Hosted on Railway (SOC 2 Type II baseline) and Cloudflare edge.

We will notify the Controller without undue delay, and in any event within 72 hours of becoming aware, of any confirmed Personal Data breach affecting Controller Personal Data. Notifications will include the nature of the breach, categories and approximate number of data subjects, likely consequences, and measures taken.

On termination, we will delete all Personal Data within 30 days, subject to any retention required by law (for tax/accounting, up to 7 years in aggregated, non-personal form). The Controller may export account and usage metadata via the dashboard or by API at any time during the service term.

The Processor will make available to the Controller, upon request, its most recent third-party audit reports (once completed, SOC 2 Type II) or equivalent summaries. Where additional audit rights are required by applicable law, the Processor will reasonably cooperate at the Controller's expense.

In case of conflict between this DPA and the Terms of Service, this DPA controls as to processing of Personal Data.

Data Protection contact: hello@quicksilverpro.io — MachineFi Inc., 68 Willow Road, Menlo Park, CA 94205, USA.

Data Processing Addendum — QuickSilver Pro

Data Processing Addendum

Account data: email address you provide on sign-up.

API keys: we store only a cryptographic hash; the raw secret is shown once at creation and not recoverable.

Usage metadata: timestamps, model name, token counts (prompt and completion), request duration, and per-request cost — for billing and abuse detection.

Payment data: handled by Stripe. We see the last four digits of the card and the billing email; we do not see full card numbers.

We do not persist the contents of your API prompts or model completions. Requests are processed in memory during the call and discarded on completion. Infrastructure partners we use for compute may have their own retention policies — see Section 5.

We use collected data to: operate and bill the service, enforce usage limits, investigate abuse, send transactional emails (receipts, security notices), and comply with legal obligations. We do not sell your data to third parties, and we do not train machine-learning models on your prompts or completions.

Account metadata is kept while your account is active and for 12 months after closure (for tax and accounting records). Usage logs are kept for 90 days. You can request earlier deletion by emailing hello@quicksilverpro.io; we will honor verified requests within 30 days subject to legal retention requirements.

We share data only with the providers required to operate the service.

Data in transit is protected with TLS 1.2+. API keys are stored as SHA-256 hashes. Stripe webhook signatures are verified against an HMAC secret. Our backend runs on Railway (SOC 2 Type II baseline). We do not persist prompt content.

You can request access to, correction of, export of, or deletion of your personal data by emailing hello@quicksilverpro.io. California residents have additional rights under the CCPA, and EU/UK residents under the GDPR, including the right not to be subject to unlawful automated decision-making. We will verify your identity before acting on requests.

We use localStorage only, to remember your signed-in API key across visits. We do not use tracking cookies, analytics cookies, or ad networks.

The service is not intended for use by anyone under 18.

We will announce material changes to this policy by email at least 30 days before taking effect.

MachineFi Inc., 68 Willow Road, Menlo Park, CA 94205, USA — hello@quicksilverpro.io

Privacy Policy — QuickSilver Pro

Privacy Policy

We provide an OpenAI-compatible HTTP API for serving popular open-source language models at predictable prices. Availability, model selection, and pricing are subject to change with reasonable notice.

You are responsible for keeping your API keys confidential and for all activity under your account. You may rotate or revoke keys at any time from the dashboard. Accounts are for a single legal entity; do not share accounts.

Service is prepaid in USD via Stripe. Credits never expire while your account remains active. Purchased credits are non-refundable once spent. Unused credits may be refunded within 7 days of purchase on written request to hello@quicksilverpro.io. Stripe charges appear on your statement as MACHINEFI INC.

You may not use the service to (a) generate content that is illegal, infringing, or otherwise violates our published usage policies; (b) attempt to reverse-engineer the service, extract model weights, or bypass rate limits; (c) send automated spam or facilitate abuse; or (d) resell the raw API without a separate written agreement.

We may throttle or temporarily block traffic that we reasonably believe is abusive or that threatens service stability for other customers. Our best-effort uptime target is 99.5% monthly, excluding scheduled maintenance and upstream provider outages. We do not offer a contractual SLA on standard plans.

The service is provided "as is" and "as available". We disclaim all warranties, express or implied, including fitness for a particular purpose and non-infringement. Model outputs may be inaccurate, offensive, or unsuitable for your use case; you are responsible for reviewing outputs before relying on them.

To the maximum extent permitted by law, our aggregate liability arising out of or related to your use of the service will not exceed the fees you paid to us in the 12 months preceding the claim. We are not liable for indirect, incidental, or consequential damages.

You may close your account at any time by emailing hello@quicksilverpro.io. We may suspend or terminate accounts that violate these Terms. Remaining unused credits will be refunded within 30 days unless termination is for breach of Section 4.

We may modify the service, pricing, or these Terms. Material changes will be announced by email or dashboard notice at least 30 days before taking effect. Continued use after the effective date constitutes acceptance.

These Terms are governed by the laws of the State of California. Any dispute will be resolved exclusively in the state or federal courts located in San Mateo County, California.

Terms of Service — QuickSilver Pro

Terms of Service

QuickSilver Pro

Stats — QuickSilver Pro

Honest stats only. Aggregate counters (tokens served, dollars saved) go live as the user base grows enough for the numbers to be credible — see the "Live counters" note below.

Compare & Use

Pricing comparisons

QuickSilver Pro vs OpenRouter

QuickSilver Pro vs Together AI

QuickSilver Pro vs Fireworks AI

QuickSilver Pro vs DeepInfra

Use-case guides

DeepSeek V3

DeepSeek R1

Qwen3.5-35B-A3B

One API · three open-source models · lowest per-token price