Subscription Plans

The ZenMux Builder Plan subscription offers individual developers a fixed monthly fee and a predictable way to call AI models—so you can focus on coding and creating without worrying about the cost of each API request.

What Are Flows?

A Flow is ZenMux’s composite billing unit that combines token consumption and per-request overhead. You can think of it as a currency—just as different products have different prices in USD, different AI models consume different numbers of Flows per request. The Flow/USD exchange rate may fluctuate over time, and the latest rate is always published in real time on the Pricing page.

💱 Real-Time Flow/USD Exchange Rate

💡 Screenshot example

The Flow/USD exchange rate and related data are dynamically calculated. The screenshot is for reference only. Please refer to the real-time data shown on the Pricing page.

Exchange rate notes

The Flow/USD exchange rate is currently anchored at 1 Flow ≈ $0.03283 (approximately 30 Flows = $1). This rate may be adjusted periodically based on market conditions and model pricing changes. The latest exchange rate will always be published and displayed here in real time.

💡 Insider member Flow value

The standard Flow value above applies to all regular subscription users. However, for early Insider members who maintain an active, continuous subscription (no interruptions), each Flow will have a higher USD equivalent value as a loyalty reward—meaning you get more value per Flow consumed.

Important — Abuse policy

For accounts found violating the Builder Plan Terms of Service (e.g., automated abuse, resource hoarding, unauthorized reselling, etc.), the effective Flow value will be reduced below the standard rate. This means the USD equivalent value per Flow will decrease. Please use your subscription responsibly.

📊 Plan Comparison — Monthly Max Flows and USD Equivalent Value

💡 Screenshot example

Plan comparison data is dynamically calculated. The screenshot is for reference only. Please refer to the real-time data shown on the Pricing page.

Plan	Price	5h Quota (Flows)	Weekly Max Flows	Monthly Max Flows	USD Equivalent Value	Value Multiplier
Free	$0/mo	5	38.64	165.6	$5.44	-
Pro	$20/mo	50	213.37	914.443	$30.03	1.50x
Max	$100/mo	300	1,280.22	5,486.659	$180.15	1.80x
Ultra	$200/mo	800	3,413.921	14,631.091	$480.40	2.40x

USD Equivalent Value = Monthly Max Flows × Flow unit price ($0.03283/Flow)
Value Multiplier = USD Equivalent Value / Plan price — indicates how many times more API value you get compared to the subscription fee

Why Choose the Builder Plan?

💡 Key Benefits

Pain Point Scenario	Subscription Solution
Worried about burning money while vibe coding	Fixed pricing starting at $20/month—code freely
High cost to learn new tech	Explore a wide range of AI models at low cost
Messy multi-platform account management	One API Key to call all models
Diverse use cases	Coding + image generation + chat—full coverage

🚀 Three Core Values

Full use-case model coverage

The Builder Plan covers three major model categories. Whether you’re a developer, designer, product manager, or operator, one subscription meets the full-spectrum needs of Vibe Builders:

Model Category	Representative Models
Coding models	Claude Opus 4.7 / GPT-5.4 / Gemini-3.1-Pro-Preview ...
Image generation	NanoBananaPro / GPT-Image-1.5 ... (rolling out)
Text generation	GPT-5.4 / Qwen3.6-Plus / GLM 5.1 / ERNIE 5.0 ...

An all-star model lineup
One subscription, orchestrating world-class models (Gemini 2.5 Pro, the GPT‑5 series, Claude Opus/Sonnet 4 series, Grok 4 series, etc.). Get access to the latest top models immediately—like commanding the strongest compute fleet on the internet.
Seamless IDE integration
No tool lock-in. One subscription API Key works across mainstream community developer tools such as Claude Code, Cursor, CodeX, and more.

Plan Comparison

Free - Free Trial

Supported models:

deepseek/deepseek-chat - DeepSeek V3.2 (Non-thinking Mode)
deepseek/deepseek-reasoner - DeepSeek V3.2 (Thinking Mode)
inclusionai/ling-1t - inclusionAI: Ling-1T
inclusionai/ling-mini-2.0 - inclusionAI: Ling-Mini-2.0
inclusionai/ring-1t - inclusionAI: Ring-1T
inclusionai/ring-mini-2.0 - inclusionAI: Ring-Mini-2.0
kuaishou/kat-coder-pro-v1-free - KAT Coder Pro V1 (Free)
minimax/minimax-m2.1 - MiniMax M2.1
sapiens-ai/agnes-1.5-lite - Sapiens AI: Agnes 1.5 Lite
sapiens-ai/agnes-1.5-pro - Sapiens AI: Agnes 1.5 Pro
sapiens-ai/agnes-image-1.2 - Sapiens AI: Agnes Image 1.2 (Image Generation)
stepfun/step-3 - StepFun: Step-3
stepfun/step-3.5-flash - StepFun: Step 3.5 Flash
stepfun/step-3.5-flash-free - StepFun: Step 3.5 Flash (Free)
xiaomi/mimo-v2-flash - Xiaomi: MiMo V2 Flash
xiaomi/mimo-v2-flash-free - Xiaomi: MiMo V2 Flash (Free)
z-ai/glm-4.6v-flash - Z.AI: GLM 4.6V FlashX
z-ai/glm-4.6v-flash-free - Z.AI: GLM 4.6V Flash (Free)
z-ai/glm-4.7 - Z.AI: GLM 4.7
z-ai/glm-4.7-flash-free - Z.AI: GLM 4.7 Flash (Free)
openai/gpt-image-2 - OpenAI: GPT Image 2 (Image Generation)

Pro - Top Choice for Developers

Supported models: 150+ models (text, image generation, video generation, embedding), organized by provider below

Anthropic Claude Series

anthropic/claude-opus-4.7 - Claude Opus 4.7
anthropic/claude-opus-4.6 - Claude Opus 4.6
anthropic/claude-opus-4.5 - Claude Opus 4.5
anthropic/claude-opus-4.1 - Claude Opus 4.1
anthropic/claude-opus-4 - Claude Opus 4
anthropic/claude-sonnet-4.6 - Claude Sonnet 4.6
anthropic/claude-sonnet-4.5 - Claude Sonnet 4.5
anthropic/claude-sonnet-4 - Claude Sonnet 4
anthropic/claude-haiku-4.5 - Claude Haiku 4.5
anthropic/claude-3.7-sonnet - Claude 3.7 Sonnet
anthropic/claude-3.5-sonnet - Claude 3.5 Sonnet
anthropic/claude-3.5-haiku - Claude 3.5 Haiku

OpenAI GPT Series

openai/gpt-5.4 - GPT‑5.4
openai/gpt-5.4-mini - GPT‑5.4 Mini
openai/gpt-5.4-nano - GPT‑5.4 Nano
openai/gpt-5.3-chat - GPT‑5.3 Chat
openai/gpt-5.3-codex - GPT‑5.3 Codex
openai/gpt-5.2 - GPT‑5.2
openai/gpt-5.2-chat - GPT‑5.2 Chat
openai/gpt-5.2-codex - GPT‑5.2 Codex
openai/gpt-5.1 - GPT‑5.1
openai/gpt-5.1-chat - GPT‑5.1 Chat
openai/gpt-5.1-codex - GPT‑5.1 Codex
openai/gpt-5.1-codex-mini - GPT‑5.1 Codex Mini
openai/gpt-5 - GPT‑5
openai/gpt-5-chat - GPT‑5 Chat
openai/gpt-5-codex - GPT‑5 Codex
openai/gpt-5-mini - GPT‑5 Mini
openai/gpt-5-nano - GPT‑5 Nano
openai/gpt-4.1 - GPT‑4.1
openai/gpt-4.1-mini - GPT‑4.1 Mini
openai/gpt-4.1-nano - GPT‑4.1 Nano
openai/gpt-4o - GPT‑4o
openai/gpt-4o-mini - GPT‑4o Mini
openai/o4-mini - o4 Mini

Google Gemini / Gemma Series

google/gemini-3.1-pro-preview - Gemini 3.1 Pro Preview
google/gemini-3.1-flash-lite-preview - Gemini 3.1 Flash Lite Preview
google/gemini-3-flash-preview - Gemini 3 Flash Preview
google/gemini-3-pro-preview - Gemini 3 Pro Preview
google/gemini-2.5-pro - Gemini 2.5 Pro
google/gemini-2.5-flash - Gemini 2.5 Flash
google/gemini-2.5-flash-lite - Gemini 2.5 Flash Lite
google/gemini-2.0-flash - Gemini 2.0 Flash
google/gemini-2.0-flash-lite-001 - Gemini 2.0 Flash Lite
google/gemma-3-12b-it - Gemma 3 12B

xAI Grok Series

x-ai/grok-4 - Grok 4
x-ai/grok-4-fast - Grok 4 Fast
x-ai/grok-4-fast-non-reasoning - Grok 4 Fast Non‑Reasoning
x-ai/grok-4.1-fast - Grok 4.1 Fast
x-ai/grok-4.1-fast-non-reasoning - Grok 4.1 Fast Non‑Reasoning
x-ai/grok-4.2-fast - Grok 4.2 Fast
x-ai/grok-4.2-fast-non-reasoning - Grok 4.2 Fast Non‑Reasoning
x-ai/grok-code-fast-1 - Grok Code Fast 1

Z.AI GLM Series

z-ai/glm-5.1 - GLM 5.1
z-ai/glm-5 - GLM 5
z-ai/glm-5-turbo - GLM 5 Turbo
z-ai/glm-5v-turbo - GLM 5V Turbo
z-ai/glm-4.7 - GLM 4.7
z-ai/glm-4.7-flashx - GLM 4.7 FlashX
z-ai/glm-4.7-flash-free - GLM 4.7 Flash (Free)
z-ai/glm-4.6v - GLM 4.6V
z-ai/glm-4.6v-flash - GLM 4.6V FlashX
z-ai/glm-4.6v-flash-free - GLM 4.6V Flash (Free)
z-ai/glm-4.6 - GLM 4.6
z-ai/glm-4.5 - GLM 4.5
z-ai/glm-4.5-air - GLM 4.5 Air

DeepSeek Series

deepseek/deepseek-v3.2 - DeepSeek V3.2
deepseek/deepseek-v3.2-exp - DeepSeek V3.2 Exp
deepseek/deepseek-chat - DeepSeek Chat (V3.2 Non-thinking)
deepseek/deepseek-chat-v3.1 - DeepSeek Chat V3.1
deepseek/deepseek-reasoner - DeepSeek Reasoner (V3.2 Thinking)
deepseek/deepseek-r1-0528 - DeepSeek R1 0528

Qwen Series

qwen/qwen3.6-plus - Qwen3.6 Plus
qwen/qwen3.5-plus - Qwen3.5 Plus
qwen/qwen3.5-flash - Qwen3.5 Flash
qwen/qwen3-coder - Qwen3 Coder
qwen/qwen3-coder-plus - Qwen3 Coder Plus
qwen/qwen3-max - Qwen3 Max Thinking
qwen/qwen3-max-preview - Qwen3 Max Thinking Preview
qwen/qwen3-vl-plus - Qwen3 VL Plus
qwen/qwen3-14b - Qwen3 14B
qwen/qwen3-235b-a22b-2507 - Qwen3 235B A22B Instruct 2507
qwen/qwen3-235b-a22b-thinking-2507 - Qwen3 235B A22B Thinking 2507

Moonshot / Kimi Series

moonshotai/kimi-k2.6 - Kimi K2.6
moonshotai/kimi-k2.5 - Kimi K2.5
moonshotai/kimi-k2-thinking - Kimi K2 Thinking
moonshotai/kimi-k2-thinking-turbo - Kimi K2 Thinking Turbo
moonshotai/kimi-k2-0711 - Kimi K2 0711
moonshotai/kimi-k2-0905 - Kimi K2 0905

Baidu ERNIE Series

baidu/ernie-5.0-thinking-preview - ERNIE 5.0
baidu/ernie-x1.1-preview - ERNIE X1.1 Preview

InclusionAI Series

inclusionai/ling-1t - Ling-1T
inclusionai/ling-flash-2.0 - Ling Flash 2.0
inclusionai/ling-mini-2.0 - Ling Mini 2.0
inclusionai/llada2.1-flash - LLaDA 2.1 Flash
inclusionai/llada2.0-flash-cap - LLaDA 2.0 Flash Cap
inclusionai/ming-flash-omni-2.0 - Ming Flash Omni 2.0
inclusionai/ring-1t - Ring-1T
inclusionai/ring-flash-2.0 - Ring Flash 2.0
inclusionai/ring-mini-2.0 - Ring Mini 2.0

Meta Llama Series

meta/llama-3.3-70b-instruct - Llama 3.3 70B Instruct
meta/llama-4-scout-17b-16e-instruct - Llama 4 Scout Instruct

Mistral Series

mistralai/mistral-large-2512 - Mistral Large 3

MiniMax Series

minimax/minimax-m2.7 - MiniMax M2.7
minimax/minimax-m2.7-highspeed - MiniMax M2.7 Highspeed
minimax/minimax-m2.5 - MiniMax M2.5
minimax/minimax-m2.5-lightning - MiniMax M2.5 Highspeed
minimax/minimax-m2.1 - MiniMax M2.1
minimax/minimax-m2 - MiniMax M2
minimax/minimax-m2-her - MiniMax M2 Her

Kuaishou

kuaishou/kat-coder-pro-v2 - KAT Coder Pro V2
kuaishou/kat-coder-pro-v1 - KAT Coder Pro V1
kuaishou/kat-coder-pro-v1-free - KAT Coder Pro V1 (Free)

StepFun

stepfun/step-3.5-flash - Step 3.5 Flash
stepfun/step-3.5-flash-free - Step 3.5 Flash (Free)
stepfun/step-3 - Step 3

ByteDance / Volcengine Doubao

Doubao models support both bytedance/* and volcengine/* slug prefixes with identical functionality.

bytedance/doubao-seed-2.0-pro - Doubao Seed 2.0 Pro
bytedance/doubao-seed-2.0-code - Doubao Seed 2.0 Code
bytedance/doubao-seed-2.0-mini - Doubao Seed 2.0 Mini
bytedance/doubao-seed-2.0-lite - Doubao Seed 2.0 Lite
bytedance/doubao-seed-1.8 - Doubao Seed 1.8
bytedance/doubao-seed-code - Doubao Seed Code
volcengine/doubao-seed-1-6-vision - Doubao Seed 1.6 Vision

Tencent

tencent/hunyuan-2.0-thinking - HunyuanTurbo 2.0 Thinking

Sapiens AI Series

sapiens-ai/agnes-1.5-pro - Agnes 1.5 Pro
sapiens-ai/agnes-1.5-lite - Agnes 1.5 Lite

Xiaomi

xiaomi/mimo-v2-pro - MiMo V2 Pro
xiaomi/mimo-v2-omni - MiMo V2 Omni
xiaomi/mimo-v2-flash - MiMo V2 Flash
xiaomi/mimo-v2-flash-free - MiMo V2 Flash (Free)

Image Generation Models

openai/gpt-image-2 - GPT Image 2
openai/gpt-image-1.5 - GPT Image 1.5
google/gemini-3.1-flash-image-preview - Gemini 3.1 Flash Image Preview
google/gemini-3-pro-image-preview - Gemini 3 Pro Image Preview
google/gemini-2.5-flash-image - Gemini 2.5 Flash Image
qwen/qwen-image-2.0-pro - Qwen Image 2.0 Pro
qwen/qwen-image-2.0 - Qwen Image 2.0
sapiens-ai/agnes-image-1.2 - Agnes Image 1.2
tencent/hunyuan-image3 - Hunyuan Image 3
z-ai/glm-image - GLM Image
bytedance/doubao-seedream-5.0-lite - Doubao Seedream 5.0 Lite

Video Generation Models

klingai/kling-v2 - Kling V2
sapiens-ai/agnes-video-v1.2 - Agnes Video V1.2

Embedding Models

openai/text-embedding-3-small - Text Embedding 3 Small

Max - High-Intensity Development

Additional exclusive models (all Pro models + the following):

Ultra-flagship text models:

openai/gpt-5.4-pro - GPT-5.4 Pro
openai/gpt-5.2-pro - GPT-5.2 Pro
openai/gpt-5-pro - GPT-5 Pro

Ultra-flagship video generation models:

google/veo-3.1-generate-001 - Google Veo 3.1
google/veo-3.1-fast-generate-001 - Google Veo 3.1 Fast
google/veo-3.1-lite-generate-001 - Google Veo 3.1 Lite
bytedance/doubao-seedance-2.0 - Doubao Seedance 2.0
bytedance/doubao-seedance-1.5-pro - Doubao Seedance 1.5 Pro

Ultra - Professional-Grade Flagship

Supported models: Same as the Max plan, including all premium models and ultra-flagship models.

Usage Limits

⚠️ Important

Subscription plans are designed for personal development, learning/exploration, and vibe coding in non-production scenarios. Please follow the usage guidelines below:

Rate Limits

Rate Limit: 10-15 RPM (requests per minute)
Quota window: Refreshes within a rolling 5-hour window
Weekly limit: Resets within a rolling weekly window

Applicable Scenarios

✅ Allowed:

Personal development and learning
Vibe coding and rapid prototyping
Technical exploration and experimentation
Personal projects and non-commercial applications

❌ Not allowed:

Production environments that are already live
Commercial products or services
End-user-facing applications
Abusive behaviors such as multi-account pooling/rotation

💡 Production recommendation

If your project is about to go live or is already commercialized, switch to the Pay-As-You-Go usage-based plan to get:

Higher SLA coverage
More stable service quality
More flexible scalability
Professional business support

Step 1: Review plan details

Visit the ZenMux Pricing page to see detailed information and pricing for all subscription plans.

Select the plan that fits your needs on the Pricing page
Click "Get Max" or "Get Ultra" for the corresponding plan (Pro users click "Upgrade")
Complete the payment flow

Step 3: Manage your subscription and get an API Key

After subscribing successfully, visit the Subscription Management page:

📊 View usage
- Usage and remaining time in the current 5-hour window
- This week’s cumulative usage stats
- Flow consumption breakdown
🔑 Get a subscription API Key
- Generate an API Key dedicated to subscriptions
- Manage and rotate existing keys
- View the key’s last used time
💳 Manage subscription
- View current plan information
- Upgrade or downgrade your plan
- View billing history

Extra Usage - Automatic Overage Switching

When enabled, once your Builder Plan subscription quota hits the 5-hour or weekly limit, it automatically switches to your selected Pay As You Go Key to ensure uninterrupted usage; when the quota resets, it automatically switches back to the subscription Key.

💡 Key Benefits

Seamless switching - Automatically switches to pay-as-you-go when quota runs out, no manual API Key changes needed
Uninterrupted workflows - No impact on your dev/coding/chat flows
Automatic recovery - Switches back to subscription billing once quota is restored
Flexible control - Enable or disable anytime

Setup Steps

Go to the Subscription Management page and follow the steps below to configure Extra Usage:

Step 1: Enable Extra Usage

In Subscription Management, find the Extra Usage section and toggle the switch on the right to enable it.

Step 2: Select a Pay As You Go API Key

After toggling, a "Select a Key" dialog will pop up. You can:

Choose an existing Pay As You Go API Key from the dropdown
Or click "Create new key" to create a new pay-as-you-go API Key

After selecting, click "Select" to confirm.

Step 3: Done

Once enabled, the page will display details of the Pay As You Go API Key you selected, including:

API Key name and key value
Enablement status
Created time and last used time
Current amount spent
Action options (reselect another key)

How It Works

Normal usage - Subscription quota (Flows) is used first
Quota exhausted - When the 5-hour or weekly window quota reaches the limit, it automatically switches to the configured Pay As You Go API Key
Usage-based billing - Calls are charged against your account balance
Automatic recovery - When the subscription quota window resets, it automatically switches back to subscription billing

💡 Recommendations

Make sure your Pay As You Go account has sufficient balance to avoid interruptions after switching
You can view Extra Usage consumption and spending at any time on the Subscription Management page
To change the backup key, click "Reselect" and choose again

⚠️ Billing reminder

After enabling Extra Usage, when your subscription quota runs out, charges will be automatically deducted from your Pay As You Go balance. Monitor your balance to avoid unexpected costs.

Step 4: Use it in developer tools

After you obtain your subscription API Key, you can use it across developer tools and applications.

Same as Pay As You Go

Subscription API Keys work exactly the same way as Pay As You Go, supporting the OpenAI SDK, Anthropic SDK, and direct HTTP calls. The only difference is that you use the subscription-specific API Key (prefixed with sk-ss-v1-), and usage is deducted from your subscription quota rather than your balance.

💡 API call example

For complete API call examples, see the Quickstart guide. Just replace the API Key in the examples with your subscription API Key.

Integrate with mainstream developer tools

Subscription API Keys can be seamlessly integrated into various AI coding tools and apps. For detailed configuration steps, see:

🔧 AI Coding Tools

Claude Code Integration Guide - Anthropic official CLI tool
CodeX Integration Guide - Intelligent code editor
Cline Integration Guide - VS Code AI assistant extension
VS Code Copilot Integration Guide - GitHub Copilot alternative
Neovate Integration Guide - Modern AI coding tool
OpenCode Integration Guide - Open-source AI coding assistant

💬 Knowledge Management & Chat Tools

Cherry Studio Integration Guide - Desktop AI chat app
Obsidian Integration Guide - Knowledge management AI plugin
Sider Integration Guide - Browser sidebar AI assistant

🤖 AI App Platforms

Dify Integration Guide - LLM app development platform
Open WebUI Integration Guide - Self-hosted AI chat UI

📚 More integrations

More integration guides are continuously being added. If you need help, visit the Discord community or contact technical support.

Using Subscriptions in Studio Chat

In addition to using your subscription quota via API Key in developer tools, you can also use your subscription quota directly in the ZenMux Studio Chat web app.

Switching billing modes

On the Studio Chat page, you can choose whether each conversation uses subscription quota or your Pay As You Go balance:

As shown, you can find the Billing Mode option in the conversation settings:

Subscription - Uses subscription quota (Flows) and does not consume account balance
Pay As You Go - Charges against your account balance based on actual usage

💡 Flexible switching

You can use different billing modes for different conversations. For example:

Daily development, learning, and prototype validation → Subscription
Production testing and commercial project validation → Pay As You Go

You can switch between the two modes anytime without affecting each other, so you can always pick the best billing method for each scenario.

⚠️ Shared quota pool

Studio Chat and API calls share the same subscription quota pool. Conversations in Studio Chat consume subscription Flows, so allocate your usage accordingly.

Upgrades & Downgrades

You can switch plans at any time during an active subscription. Upgrades (e.g., Pro → Max) take effect immediately and are billed only for the remaining time in the current cycle; downgrades take effect at the end of the current cycle and incur no additional charge.

Upgrade Proration

When you upgrade, you only pay the price difference for the time left in the current billing cycle — not a full month of the new plan.

Variables:

Symbol	Meaning
`P_old`	Monthly price of the current plan (USD)
`P_new`	Monthly price of the target plan (USD)
`T`	Total length of the current billing cycle (~1 month)
`T_rem`	Time remaining until the current cycle ends
`Δ`	Prorated charge due at upgrade

Formula:

text

Δ = max(0, (P_new − P_old) × (T_rem / T))

In plain English: proration = plan price difference × fraction of the cycle remaining. If P_new ≤ P_old (i.e., not actually an upgrade), the charge is 0.

Example: Upgrading from Pro ($20/month) to Max ($100/month) with 15 days left in a 30-day cycle:

text

Δ = (100 − 20) × (15 / 30) = 80 × 0.5 = $40

You are charged $40 at upgrade time; the next renewal bills the full Max price ($100) as usual.

💡 Billing cycle stays anchored

Upgrading does not reset your billing cycle — the next renewal date remains the same. This avoids an "upgrade equals renewal" double-charge.

Refunds

If you're unsatisfied with your current subscription or need to cancel, you can submit a refund request from the Subscription Management page.

Refund Eligibility

✅ Paid subscriptions (Pro / Max / Ultra) can request a refund within 24 hours of subscribing

⚠️ Refund time limit

Refund requests must be submitted within 24 hours of successful subscription. Requests submitted after this window cannot be processed. Please confirm whether the plan meets your needs promptly after subscribing.

Refund Calculation

Refund amounts are calculated as follows:

Item	Description
Total paid	Full amount paid in the current billing cycle
- Actual usage	Equivalent value of API calls consumed during the subscription
- Already refunded	Amount previously refunded (if any)
= Refundable balance	Remaining refundable amount after deducting usage and prior refunds
- Stripe fee (5%)	Payment platform refund processing fee
= Final refund amount	Amount actually returned to your payment method

⚠️ Non-refundable cases

If the equivalent API usage value has exceeded your subscription payment amount, the subscription is not eligible for a refund.

Refund Process

Step 1: Initiate a refund

Go to the Subscription Management page and click the "Refund" button in the Billing History section.

Step 2: Confirm refund details

The system will display a refund preview including the total paid, actual usage, fees, and final refund amount. After confirming, click "Submit Refund".

Step 3: Wait for processing

After submitting the refund, you can check the processing status in the refund dialog:

Status	Description
🔵 Processing	Refund is being processed and will be returned within 1-3 business days
🟢 Succeeded	Refund is complete and funds have been returned to your payment method
🔴 Failed	Refund could not be processed — please contact support
⚪ Canceled	Refund request has been canceled

After Refund

Please note the following changes after a successful refund:

Your subscription will be immediately downgraded to the Free plan
Refunded funds will be returned to the original payment method within 1-3 business days
Pending API calls may affect the final refund amount

💡 Need help?

If you have questions about the refund calculation or need manual assistance, email [email protected].

FAQ

What’s the difference between subscriptions and pay-as-you-go?

Feature	Subscription (Builder Plan)	Pay-As-You-Go
Billing model	Fixed monthly fee	Usage-based billing
Best for	Personal dev, learning	Production, commercial apps
Cost predictability	✅ High (fixed monthly fee)	⚠️ Medium (varies with usage)
Rate limits	10-15 RPM	Higher, customizable
SLA	Standard	Higher
Value multiplier	✅ 1.50-2.40x	Standard API pricing

When does the quota reset?

5-hour window: Uses a rolling window mechanism. Metering starts when you send a request and resets every 5 hours.
Weekly limit: Metering starts when you send a request and resets every 7 days.

You can view remaining quota and reset times in real time on the Subscription Management page.

Can I use multiple plans at the same time?

No. One account can only have one active subscription plan at a time. If you need higher limits, upgrade to Max or Ultra.

Next Steps

Now that you understand how the Builder Plan subscription works, you can:

📚 Read the Quickstart guide to learn detailed API usage
🔧 Check Best Practices to integrate your subscription API Key into developer tools
💰 Learn about the Pay-as-you-go plan for production billing
📊 Visit the Usage Analytics page to monitor subscription quota consumption in real time
💵 Review Cost Analysis to learn how to optimize costs

If you run into any issues, feel free to reach out via:

Official website: https://zenmux.ai
Support email: [email protected]
Business email: [email protected]
Twitter: @ZenMuxAI
Discord: https://discord.gg/vHZZzj84Bm

For more contact options and details, visit our Contact page.

Subscription Plans ​

What Are Flows? ​

💱 Real-Time Flow/USD Exchange Rate ​

📊 Plan Comparison — Monthly Max Flows and USD Equivalent Value ​

Why Choose the Builder Plan? ​

💡 Key Benefits ​

🚀 Three Core Values ​

Plan Comparison ​

Free - Free Trial ​

Pro - Top Choice for Developers ​

Max - High-Intensity Development ​

Ultra - Professional-Grade Flagship ​

Usage Limits ​

Rate Limits ​

Applicable Scenarios ​

How to Subscribe ​

Step 1: Review plan details ​

Step 2: Choose and subscribe ​

Step 3: Manage your subscription and get an API Key ​

Extra Usage - Automatic Overage Switching ​

💡 Key Benefits ​

Setup Steps ​

How It Works ​

Step 4: Use it in developer tools ​

Same as Pay As You Go ​

Integrate with mainstream developer tools ​

Using Subscriptions in Studio Chat ​

Switching billing modes ​

Upgrades & Downgrades ​

Upgrade Proration ​

Refunds ​

Refund Eligibility ​

Refund Calculation ​

Refund Process ​

After Refund ​

FAQ ​

What’s the difference between subscriptions and pay-as-you-go? ​

When does the quota reset? ​

Can I use multiple plans at the same time? ​

Next Steps ​

Subscription Plans

What Are Flows?

💱 Real-Time Flow/USD Exchange Rate

📊 Plan Comparison — Monthly Max Flows and USD Equivalent Value

Why Choose the Builder Plan?

💡 Key Benefits

🚀 Three Core Values

Plan Comparison

Free - Free Trial

Pro - Top Choice for Developers

Max - High-Intensity Development

Ultra - Professional-Grade Flagship

Usage Limits

Rate Limits

Applicable Scenarios

How to Subscribe

Step 1: Review plan details

Step 2: Choose and subscribe

Step 3: Manage your subscription and get an API Key

Extra Usage - Automatic Overage Switching

💡 Key Benefits

Setup Steps

How It Works

Step 4: Use it in developer tools

Same as Pay As You Go

Integrate with mainstream developer tools

Using Subscriptions in Studio Chat

Switching billing modes

Upgrades & Downgrades

Upgrade Proration

Refunds

Refund Eligibility

Refund Calculation

Refund Process

After Refund

FAQ

What’s the difference between subscriptions and pay-as-you-go?

When does the quota reset?

Can I use multiple plans at the same time?

Next Steps