💧 Spraay Solana Gateway

x402-powered batch payment infrastructure for AI agents on Solana.

Any AI agent can batch send SOL, USDC, BONK, or any SPL token to 1,000+ wallets via the x402 payment protocol. No API keys. No accounts. Pay per request.

🏗️ Architecture

AI Agent (any framework)
    │
    ├── HTTP Request
    │
    ▼
┌──────────────────────────────────────────┐
│   Spraay Solana Gateway                  │
│   gateway-solana.spraay.app              │
│                                          │
│   @x402/express + @x402/svm             │
│   ┌─────────────┐  ┌──────────────┐     │
│   │ x402 Payment│  │ Solana Batch │     │
│   │ Middleware   │  │ Engine       │     │
│   └──────┬──────┘  └──────┬───────┘     │
│          │                │              │
│          ▼                ▼              │
│   USDC payment     Execute batch        │
│   verified via     SOL/SPL transfers    │
│   facilitator                           │
└──────────────────────────────────────────┘
    │
    ▼
Solana Network

📡 Endpoints

Endpoint	Method	Price	Description
/solana/batch-send-sol	POST	$0.01	Batch send SOL to multiple wallets
/solana/batch-send-token	POST	$0.01	Batch send any SPL token
/solana/quote	GET	$0.001	Get cost estimate
/solana/status/:txid	GET	$0.001	Check transaction status
/health	GET	Free	Health check
/.well-known/x402	GET	Free	x402 discovery manifest

🚀 Quick Start

1. Clone & Install

git clone https://github.com/plagtech/spraay-solana-gateway.git
cd spraay-solana-gateway
npm install

2. Configure

cp .env.example .env
# Edit .env with your treasury wallet and private key

3. Run

npm run dev    # development (auto-reload)
npm start      # production

📖 API Usage

Batch Send SOL

curl -X POST https://gateway-solana.spraay.app/solana/batch-send-sol \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <base64 payment proof>" \
  -d '{
    "recipients": [
      { "address": "9WzDXwBbmkg8ZTbNMqUxvQRAyrZzDsGYdLVL9zYtAWWM", "amount": 0.01 },
      { "address": "7S3P4HxJpyyigGzodYwHtCxZyUQe9JiBMHyLWP9SfKFJ", "amount": 0.02 }
    ]
  }'

Batch Send SPL Token

curl -X POST https://gateway-solana.spraay.app/solana/batch-send-token \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <base64 payment proof>" \
  -d '{
    "mint": "DezXAZ8z7PnrnRJjz3wXBoRgixCa6xjnB7YaB1pPB263",
    "recipients": [
      { "address": "9WzDXwBbmkg8ZTbNMqUxvQRAyrZzDsGYdLVL9zYtAWWM", "amount": 1000 },
      { "address": "7S3P4HxJpyyigGzodYwHtCxZyUQe9JiBMHyLWP9SfKFJ", "amount": 500 }
    ]
  }'

Get Quote

curl "https://gateway-solana.spraay.app/solana/quote?recipients=100&token=BONK"

🔐 x402 Payment Flow

1. Agent sends request without payment header
2. Gateway returns 402 Payment Required with Solana USDC payment instructions
3. Agent sends USDC on Solana to the treasury address
4. Agent retries request with payment proof in X-PAYMENT header
5. Gateway verifies payment via facilitator, executes batch transfer

Supported facilitators:

• Devnet: https://x402.org/facilitator
• Mainnet: https://facilitator.payai.network (PayAI — free tx fees)

🤖 MCP Server

The gateway includes an MCP server for AI agent framework integration:

# Install MCP SDK
npm install @modelcontextprotocol/sdk

# Run MCP server
node mcp/spraay-solana-mcp.js

Tools available:

• spraay_solana_batch_send_sol — Batch send SOL
• spraay_solana_batch_send_token — Batch send SPL tokens
• spraay_solana_quote — Cost estimation
• spraay_solana_tx_status — Transaction lookup

🌐 Deployment

Railway

1. Create new service in Railway project
2. Connect GitHub repo: plagtech/spraay-solana-gateway
3. Set environment variables in Railway dashboard
4. Deploy → configure custom domain

DNS (GoDaddy)

Type: CNAME
Name: gateway-solana
Value: <railway-app-url>.railway.app
TTL: 600

🔗 Spraay Ecosystem

Service	URL
Spraay App	spraay.app
Base Gateway	gateway.spraay.app
Solana Gateway	gateway-solana.spraay.app
GitHub	github.com/plagtech
Twitter	@Spraay_app

📄 License

MIT