added calculateAnchorFee function

.gitignore

@@ -33,4 +33,6 @@ coverage/
 
 # TypeScript
 *.tsbuildinfo
-target
+target
+
+issue.md

package.json

@@ -38,5 +38,6 @@
     "turbo": "^1.13.4",
     "typescript": "^5.9.3",
     "typescript-eslint": "^8.56.1"
-  }
+  },
+  "packageManager": "pnpm@10.30.2+sha512.36cdc707e7b7940a988c9c1ecf88d084f8514b5c3f085f53a2e244c2921d3b2545bc20dd4ebe1fc245feec463bb298aecea7a63ed1f7680b877dc6379d8d0cb4"
 }

packages/anchor-service/dist/index.js

@@ -1 +1,77 @@
 "use strict";
+var __defProp = Object.defineProperty;
+var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
+var __getOwnPropNames = Object.getOwnPropertyNames;
+var __hasOwnProp = Object.prototype.hasOwnProperty;
+var __export = (target, all) => {
+  for (var name in all)
+    __defProp(target, name, { get: all[name], enumerable: true });
+};
+var __copyProps = (to, from, except, desc) => {
+  if (from && typeof from === "object" || typeof from === "function") {
+    for (let key of __getOwnPropNames(from))
+      if (!__hasOwnProp.call(to, key) && key !== except)
+        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
+  }
+  return to;
+};
+var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
+
+// src/index.ts
+var index_exports = {};
+__export(index_exports, {
+  TransactionType: () => TransactionType,
+  calculateAnchorFee: () => calculateAnchorFee
+});
+module.exports = __toCommonJS(index_exports);
+var TransactionType = /* @__PURE__ */ ((TransactionType2) => {
+  TransactionType2["DEPOSIT"] = "deposit";
+  TransactionType2["WITHDRAWAL"] = "withdrawal";
+  TransactionType2["TRANSFER"] = "transfer";
+  return TransactionType2;
+})(TransactionType || {});
+var FEE_SCHEDULES = {
+  USDC: {
+    ["deposit" /* DEPOSIT */]: { flatFee: 0.5, percentageFee: 1e-3 },
+    ["withdrawal" /* WITHDRAWAL */]: { flatFee: 1, percentageFee: 2e-3 },
+    ["transfer" /* TRANSFER */]: { flatFee: 0.25, percentageFee: 5e-4 }
+  },
+  XLM: {
+    ["deposit" /* DEPOSIT */]: { flatFee: 0.01, percentageFee: 5e-4 },
+    ["withdrawal" /* WITHDRAWAL */]: { flatFee: 0.05, percentageFee: 1e-3 },
+    ["transfer" /* TRANSFER */]: { flatFee: 0.01, percentageFee: 5e-4 }
+  }
+};
+var DEFAULT_FEE_SCHEDULE = {
+  flatFee: 1,
+  percentageFee: 5e-3
+};
+function toFixed(value, decimals = 7) {
+  return value.toFixed(decimals);
+}
+async function calculateAnchorFee(amount, asset, type) {
+  const parsedAmount = parseFloat(amount);
+  if (isNaN(parsedAmount) || parsedAmount < 0) {
+    throw new Error(`Invalid amount: ${amount}`);
+  }
+  const assetSchedules = FEE_SCHEDULES[asset.toUpperCase()];
+  const schedule = (assetSchedules && assetSchedules[type]) ?? DEFAULT_FEE_SCHEDULE;
+  const flatFee = schedule.flatFee;
+  const percentageFee = parsedAmount * schedule.percentageFee;
+  const totalFee = flatFee + percentageFee;
+  const netAmount = Math.max(0, parsedAmount - totalFee);
+  return {
+    asset,
+    transactionType: type,
+    inputAmount: toFixed(parsedAmount),
+    flatFee: toFixed(flatFee),
+    percentageFee: toFixed(percentageFee),
+    totalFee: toFixed(totalFee),
+    netAmount: toFixed(netAmount)
+  };
+}
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  TransactionType,
+  calculateAnchorFee
+});

packages/anchor-service/dist/index.mjs

@@ -0,0 +1,51 @@
+// src/index.ts
+var TransactionType = /* @__PURE__ */ ((TransactionType2) => {
+  TransactionType2["DEPOSIT"] = "deposit";
+  TransactionType2["WITHDRAWAL"] = "withdrawal";
+  TransactionType2["TRANSFER"] = "transfer";
+  return TransactionType2;
+})(TransactionType || {});
+var FEE_SCHEDULES = {
+  USDC: {
+    ["deposit" /* DEPOSIT */]: { flatFee: 0.5, percentageFee: 1e-3 },
+    ["withdrawal" /* WITHDRAWAL */]: { flatFee: 1, percentageFee: 2e-3 },
+    ["transfer" /* TRANSFER */]: { flatFee: 0.25, percentageFee: 5e-4 }
+  },
+  XLM: {
+    ["deposit" /* DEPOSIT */]: { flatFee: 0.01, percentageFee: 5e-4 },
+    ["withdrawal" /* WITHDRAWAL */]: { flatFee: 0.05, percentageFee: 1e-3 },
+    ["transfer" /* TRANSFER */]: { flatFee: 0.01, percentageFee: 5e-4 }
+  }
+};
+var DEFAULT_FEE_SCHEDULE = {
+  flatFee: 1,
+  percentageFee: 5e-3
+};
+function toFixed(value, decimals = 7) {
+  return value.toFixed(decimals);
+}
+async function calculateAnchorFee(amount, asset, type) {
+  const parsedAmount = parseFloat(amount);
+  if (isNaN(parsedAmount) || parsedAmount < 0) {
+    throw new Error(`Invalid amount: ${amount}`);
+  }
+  const assetSchedules = FEE_SCHEDULES[asset.toUpperCase()];
+  const schedule = (assetSchedules && assetSchedules[type]) ?? DEFAULT_FEE_SCHEDULE;
+  const flatFee = schedule.flatFee;
+  const percentageFee = parsedAmount * schedule.percentageFee;
+  const totalFee = flatFee + percentageFee;
+  const netAmount = Math.max(0, parsedAmount - totalFee);
+  return {
+    asset,
+    transactionType: type,
+    inputAmount: toFixed(parsedAmount),
+    flatFee: toFixed(flatFee),
+    percentageFee: toFixed(percentageFee),
+    totalFee: toFixed(totalFee),
+    netAmount: toFixed(netAmount)
+  };
+}
+export {
+  TransactionType,
+  calculateAnchorFee
+};

packages/anchor-service/src/index.ts

@@ -0,0 +1,73 @@
+export enum TransactionType {
+  DEPOSIT = 'deposit',
+  WITHDRAWAL = 'withdrawal',
+  TRANSFER = 'transfer',
+}
+
+export interface FeeQuote {
+  asset: string;
+  transactionType: TransactionType;
+  inputAmount: string;
+  flatFee: string;
+  percentageFee: string;
+  totalFee: string;
+  netAmount: string;
+}
+
+interface FeeSchedule {
+  flatFee: number;
+  percentageFee: number; // e.g. 0.01 = 1%
+}
+
+type AssetFeeSchedules = Record<string, Partial<Record<TransactionType, FeeSchedule>>>;
+
+const FEE_SCHEDULES: AssetFeeSchedules = {
+  USDC: {
+    [TransactionType.DEPOSIT]: { flatFee: 0.5, percentageFee: 0.001 },
+    [TransactionType.WITHDRAWAL]: { flatFee: 1.0, percentageFee: 0.002 },
+    [TransactionType.TRANSFER]: { flatFee: 0.25, percentageFee: 0.0005 },
+  },
+  XLM: {
+    [TransactionType.DEPOSIT]: { flatFee: 0.01, percentageFee: 0.0005 },
+    [TransactionType.WITHDRAWAL]: { flatFee: 0.05, percentageFee: 0.001 },
+    [TransactionType.TRANSFER]: { flatFee: 0.01, percentageFee: 0.0005 },
+  },
+};
+
+const DEFAULT_FEE_SCHEDULE: FeeSchedule = {
+  flatFee: 1.0,
+  percentageFee: 0.005,
+};
+
+function toFixed(value: number, decimals = 7): string {
+  return value.toFixed(decimals);
+}
+
+export async function calculateAnchorFee(
+  amount: string,
+  asset: string,
+  type: TransactionType,
+): Promise<FeeQuote> {
+  const parsedAmount = parseFloat(amount);
+  if (isNaN(parsedAmount) || parsedAmount < 0) {
+    throw new Error(`Invalid amount: ${amount}`);
+  }
+
+  const assetSchedules = FEE_SCHEDULES[asset.toUpperCase()];
+  const schedule: FeeSchedule = (assetSchedules && assetSchedules[type]) ?? DEFAULT_FEE_SCHEDULE;
+
+  const flatFee = schedule.flatFee;
+  const percentageFee = parsedAmount * schedule.percentageFee;
+  const totalFee = flatFee + percentageFee;
+  const netAmount = Math.max(0, parsedAmount - totalFee);
+
+  return {
+    asset,
+    transactionType: type,
+    inputAmount: toFixed(parsedAmount),
+    flatFee: toFixed(flatFee),
+    percentageFee: toFixed(percentageFee),
+    totalFee: toFixed(totalFee),
+    netAmount: toFixed(netAmount),
+  };
+}