calculator derived

{
  "input": {
    "type": "http",
    "method": "GET",
    "queryParams": {
      "trade_size_usd": "10000"
    }
  },
  "output": {
    "type": "json",
    "errors": {
      "400": {
        "example": {
          "error": "invalid request"
        },
        "description": "Invalid or missing parameter(s). Returned before the payment gate on paid requests, so a malformed call is never charged. JSON body: { error: <what is wrong and how to fix it> } plus usage hints."
      },
      "402": {
        "description": "Payment required — x402 v2 challenge; the accepts array lists scheme, network, and amount. Retry the same request with a PAYMENT-SIGNATURE (v2) or X-PAYMENT (v1) header. Verification is free."
      },
      "500": {
        "example": {
          "error": "upstream_failed"
        },
        "description": "Unexpected server error. If a payment settled without a usable result, contact info@theaslangroupllc.com with the settlement tx hash for a re-run or credit."
      }
    },
    "example": {
      "inputs": {
        "gas_usd": 0.5,
        "arb_type": "spot",
        "exit_price": 67950,
        "entry_price": 67800,
        "slippage_bps": 5,
        "taker_fee_bps": 10,
        "trade_size_usd": 10000
      },
      "verdict": "NOT VIABLE — costs exceed spread",
      "suggestion": "This spot arb is marginal at $10k. Minimum $50k+ for positive P&L. Consider perps funding carry for better risk-adjusted returns.",
      "fee_breakdown": {
        "gas_usd": 0.5,
        "slippage_usd": 5,
        "flash_fee_usd": 0,
        "bridge_fee_usd": 0,
        "total_costs_pct": 0.255,
        "total_costs_usd": 25.5,
        "taker_fee_buy_usd": 10,
        "taker_fee_sell_usd": 10,
        "withdrawal_fee_usd": 0
      },
      "net_profit_pct": -0.034,
      "net_profit_usd": -3.38,
      "scale_analysis": [
        {
          "net_pct": 0.032,
          "size_usd": 50000,
          "net_profit_usd": 16.1
        },
        {
          "net_pct": 0.057,
          "size_usd": 100000,
          "net_profit_usd": 57.2
        },
        {
          "net_pct": 0.072,
          "size_usd": 500000,
          "net_profit_usd": 357.5
        }
      ],
      "gross_spread_pct": 0.221,
      "gross_spread_usd": 22.12,
      "break_even_analysis": {
        "gap_bps": 4,
        "current_spread_bps": 22,
        "min_spread_bps_to_break_even": 26
      },
      "annualized_yield_pct": null
    }
  }
}