curl -X POST '/v1/agent/transact' \
  -H 'Authorization: Bearer yac_connector_api_key' \
  -H 'Content-Type: application/json' \
  -d '{
    "wallet_id": "aw_01abc123",
    "amount": 5.00,
    "asset": "USDC",
    "recipient_address": "0x9F8b3A2c1E4D7F6B5A4C3D2E1F0A9B8C7D6E5F4",
    "service_name": "OpenAI API",
    "service_url": "https://api.openai.com",
    "payment_reason": "GPT-4 inference for customer support bot",
    "payment_category": "ai_service"
  }'

{
  "success": true,
  "data": {
    "transaction_id": "atx_01pqr456",
    "tx_hash": "0xabc123def456...",
    "amount": 5.00,
    "asset": "USDC",
    "recipient_address": "0x9F8b3A2c1E4D7F6B5A4C3D2E1F0A9B8C7D6E5F4",
    "chain": "base",
    "status": "completed",
    "fee": 0.00,
    "is_free_transaction": true,
    "service_name": "OpenAI API",
    "payment_category": "ai_service"
  }
}