From d57d5e1fd1e3b8a644840cf7df026cae0cbb7814 Mon Sep 17 00:00:00 2001
From: Paul V Puey <paul@edge.app>
Date: Tue, 9 Jun 2026 11:59:15 -0700
Subject: [PATCH] Infer LetsExchange native network when API omits network
 fields

Some older LetsExchange transactions return null network fields for
unambiguous native assets (e.g. ETH, BTC, XRP), causing processing to
throw "Missing network" and stalling the query. Add a currency-to-network
fallback for 1:1 native tickers so these transactions process correctly.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 src/partners/letsexchange.ts | 71 +++++++++++++++++++++++++++++++++---
 1 file changed, 65 insertions(+), 6 deletions(-)

diff --git a/src/partners/letsexchange.ts b/src/partners/letsexchange.ts
index e05a8718..c57bc28f 100644
--- a/src/partners/letsexchange.ts
+++ b/src/partners/letsexchange.ts
@@ -201,6 +201,68 @@ const LETSEXCHANGE_NETWORK_TO_PLUGIN_ID: Record<string, string> = {
   ZKSYNC: 'zksync'
 }
 
+// When the API omits network fields, infer native chain from currency code.
+// Only unambiguous 1:1 native-ticker cases (not USDT, USDC, BNB, etc.).
+const LETSEXCHANGE_CURRENCY_TO_DEFAULT_NETWORK: Record<string, string> = {
+  ADA: 'ADA',
+  ALGO: 'ALGO',
+  ARRR: 'ARRR',
+  ATOM: 'ATOM',
+  AVAX: 'AVAXC',
+  BCH: 'BCH',
+  BSV: 'BSV',
+  BTC: 'BTC',
+  BTG: 'BTG',
+  CELO: 'CELO',
+  COREUM: 'COREUM',
+  DASH: 'DASH',
+  DGB: 'DGB',
+  DOGE: 'DOGE',
+  DOT: 'DOT',
+  EOS: 'EOS',
+  ETC: 'ETC',
+  ETH: 'ETH',
+  ETHW: 'ETHW',
+  FIL: 'FIL',
+  FIO: 'FIO',
+  FIRO: 'FIRO',
+  FTM: 'FTM',
+  GRS: 'GRS',
+  HBAR: 'HBAR',
+  LTC: 'LTC',
+  MATIC: 'MATIC',
+  PIVX: 'PIVX',
+  POL: 'POL',
+  PLS: 'PLS',
+  QTUM: 'QTUM',
+  RUNE: 'RUNE',
+  RVN: 'RVN',
+  SOL: 'SOL',
+  SONIC: 'SONIC',
+  SUI: 'SUI',
+  TLOS: 'TLOS',
+  TON: 'TON',
+  TRX: 'TRX',
+  XEC: 'XEC',
+  XLM: 'XLM',
+  XMR: 'XMR',
+  XRP: 'XRP',
+  XTZ: 'XTZ',
+  ZANO: 'ZANO',
+  ZEC: 'ZEC'
+}
+
+function resolveNetworkCode(
+  network: string | null,
+  currencyCode: string,
+  isoDate: string
+): string | null {
+  if (network != null) return network
+  if (isoDate < NETWORK_FIELDS_AVAILABLE_DATE) return null
+  const currencyUpper = currencyCode.toUpperCase()
+  return LETSEXCHANGE_CURRENCY_TO_DEFAULT_NETWORK[currencyUpper] ?? null
+}
+
 // Native token placeholder addresses that should be treated as null (native coin)
 // All values should be lowercase for case-insensitive matching
 const NATIVE_TOKEN_ADDRESSES = new Set([
@@ -299,13 +361,10 @@ function getAssetInfo(
   contractAddress: string | null,
   isoDate: string
 ): AssetInfo | undefined {
-  if (initialNetwork == null) {
-    if (isoDate < NETWORK_FIELDS_AVAILABLE_DATE) {
-      return undefined
-    }
-    throw new Error(`Missing network for currency ${currencyCode}`)
+  const network = resolveNetworkCode(initialNetwork, currencyCode, isoDate)
+  if (network == null) {
+    return undefined
   }
-  const network = initialNetwork
 
   const networkUpper = network.toUpperCase()
   const chainPluginId = LETSEXCHANGE_NETWORK_TO_PLUGIN_ID[networkUpper]