# Overview

BlockATM is the world's first decentralized cryptocurrency payment protocol, based on blockchain smart contract technology, providing businesses with a secure, self-custodial payment solution.

## Differences from Traditional Payment

| Comparison        | Traditional Payment          | BlockATM                    |
| ----------------- | ---------------------------- | --------------------------- |
| Fund Custody      | Payment institution custody  | Smart contract custody      |
| Control           | Payment institution controls | Enterprise has full control |
| Withdrawal Limits | Amount and time limits       | No limits                   |
| Settlement Speed  | 1-3 business days            | Real-time                   |
| Fee Transparency  | Complex billing              | Fixed rate                  |

## Core Features

### 🔐 Self-Custody

Your smart contracts are owned by the enterprise, deployed on the blockchain, publicly transparent, and immutable. Only your designated **Signer address** can withdraw assets from the contract. BlockATM cannot access your funds.

### 🌐 Permissionless

Asset withdrawal requires no authorization from anyone, no amount limits, no time limits. Withdraw anytime, 24/7.

### 🔗 Multi-Chain Support

Supports mainstream blockchain networks:

* **TRON** (TRC20) - Low fees, high throughput
* **Ethereum** (ERC20) - Most widely used
* **Arbitrum** (ARB20) - Ethereum Layer 2

### 💰 Transparent Fees

| Service                     | Fee               |
| --------------------------- | ----------------- |
| Smart Contract Creation     | 200 USD/contract  |
| Collection (Wallet Connect) | 2 USD/transaction |
| Collection (Scan Payment)   | 0.4%/transaction  |
| Payout                      | 1 USD/transaction |

## System Architecture

```mermaid
%%{
  init: {
    'theme': 'neutral',
    'themeVariables': {
      'primaryColor': '#6366F1',
      'lineColor': '#94A3B8'
    }
  }
}%%
graph LR
    A["👤 User"] -->|"① Initiate Payment"| B["🏪 BlockATM<br/>Cashier"]
    B -->|"② On-Chain Execution"| C["⛓️ Blockchain"]
    C -->|"③ Event Notification"| B
    B -->|"④ Webhook"| D["📱 Merchant System"]

    style A fill:#EEF2FF,stroke:#6366F1,color:#4338CA
    style B fill:#FEF3C7,stroke:#F59E0B,color:#92400E
    style C fill:#DBEAFE,stroke:#3B82F6,color:#1E40AF
    style D fill:#D1FAE5,stroke:#10B981,color:#065F46
```

**Supported Networks**: TRON (TRC-20) · Ethereum (ERC-20) · Arbitrum (ARB-20)

## Fund Flow

```mermaid
%%{
  init: { 'theme': 'neutral' }
}%%
graph LR
    A["👤 User Wallet"] -->|"① Transfer to Contract"| B["📦 Smart Contract"]
    B -->|"② Asset Custody"| C["💎 Contract Balance"]
    C -->|"③ Withdraw as Needed"| D["🏦 Merchant Wallet"]

    style A fill:#EEF2FF,stroke:#6366F1,color:#4338CA
    style B fill:#FEF3C7,stroke:#F59E0B,color:#92400E
    style C fill:#DBEAFE,stroke:#3B82F6,color:#1E40AF
    style D fill:#D1FAE5,stroke:#10B981,color:#065F46
```

## Payment Flow

```mermaid
%%{
  init: {
    'theme': 'neutral',
    'themeVariables': {
      'primaryColor': '#6366F1',
      'primaryTextColor': '#1E293B'
    }
  }
}%%
stateDiagram-v2
    [*] --> Pending: Merchant Creates Order
    Pending --> Paid: User Completes Transfer
    Pending --> Cancelled: User Cancels
    Pending --> Expired: Timeout
    Paid --> [*]: Flow Ends
    Cancelled --> [*]: Flow Ends
    Expired --> [*]: Flow Ends

    note right of Paid
        Funds received in contract
        Webhook notifies merchant
    end note
```

## Use Cases

* ✅ **E-commerce Collection** - Accept cryptocurrency payments, manage funds independently
* ✅ **Batch Payout** - Automated payments to users, no manual transfers
* ✅ **Fund Collection** - Automatically collect user payments to designated address
* ✅ **DApp Integration** - Embed cryptocurrency payments in your application

{% hint style="info" %}
**No KYB/KYC Required**: BlockATM is a decentralized application; enterprises do not need to submit identity verification materials to any institution.
{% endhint %}


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