Constants & Errors

export const CHAIN = {
  MAINNET_ID: 4663,
  TESTNET_ID: 46630,
  GAS_ASSET: "ETH",
  ACCOUNTING_ASSET: "USDG",
  DEPOSIT_CAP_USDG: 50_000n * 1_000_000n,  // 50,000 USDG in base units
} as const;

class NavError extends Error {
  readonly code: NavErrorCode;
}
type NavErrorCode =
  | "INVALID_DECIMALS"   // decimals outside [0, 36] or non-integer
  | "NEGATIVE_VALUE"     // negative cash / balance / shares / liabilities
  | "ZERO_PRICE"         // price ≤ 0
  | "STALE_PRICE"        // price age outside maxStalenessSec, or now missing
  | "DIVIDE_BY_ZERO";

import { NavError, calculateNav } from "@seat/sdk";

try {
  const nav = calculateNav(cash, positions, { now, maxStalenessSec: 120 });
} catch (err) {
  if (err instanceof NavError) {
    // fail closed: do not trade or display a NAV you cannot stand behind
    console.warn("NAV unavailable:", err.code, err.message);
  } else {
    throw err;
  }
}