curl https://win.oneshotagent.com/v1/compute/goal_01HX8K3YZ/budget \
  -H "Content-Type: application/json"

{
  "success": true,
  "data": {
    "totalBudgetUsdc": "8.500000",
    "spentUsdc": "2.150000",
    "reservedUsdc": "3.000000",
    "remainingUsdc": "3.350000",
    "spend_entries": [
      {
        "category": "research",
        "amount_usdc": "0.850000",
        "description": "Deep research: AI agent frameworks",
        "created_at": "2026-01-15T12:04:50Z"
      },
      {
        "category": "orchestrator",
        "amount_usdc": "0.300000",
        "description": "Orchestrator wake: planning phase 2",
        "created_at": "2026-01-15T12:04:55Z"
      },
      {
        "category": "sandbox",
        "amount_usdc": "1.000000",
        "description": "Sandbox compute: 0.4 hours",
        "created_at": "2026-01-15T12:04:50Z"
      }
    ]
  }
}