From 64cf55d64ee164775e06cc8bb6090227a8b629ea Mon Sep 17 00:00:00 2001
From: Corey-Code <37006206+Corey-Code@users.noreply.github.com>
Date: Thu, 22 Oct 2026 14:26:25 -0400
Subject: [PATCH] Simulate BeeZee fees on the chain REST instead of the dead
 proxy.

---
 src/lib/cosmos/fees.ts        | 12 +++++++-----
 tests/lib/cosmos/fees.test.ts | 13 +++++++++++++
 2 files changed, 20 insertions(+), 5 deletions(-)
 create mode 100644 tests/lib/cosmos/fees.test.ts

diff --git a/src/lib/cosmos/fees.ts b/src/lib/cosmos/fees.ts
index f983e8e..044e583 100644
--- a/src/lib/cosmos/fees.ts
+++ b/src/lib/cosmos/fees.ts
@@ -42,8 +42,6 @@ export interface SimulateResult {
   gasWanted: number;
 }
 
-const BZE_SIMULATE_PROXY_URL = 'https://api.vidulum.app/bze/cosmos/tx/v1beta1/simulate';
-
 // Cache for params
 let tradebinParamsCache: TradebinParams | null = null;
 let tradebinParamsCacheTime = 0;
@@ -148,6 +146,12 @@ export function parseFeeString(feeStr: string): { amount: string; denom: string
   return { amount: '0', denom: 'ubze' };
 }
 
+/** Chain REST simulate path. BeeZee answers this directly; do not proxy it. */
+export function cosmosSimulateUrl(restEndpoint: string): string {
+  const base = restEndpoint.replace(/\/$/, '');
+  return `${base}/cosmos/tx/v1beta1/simulate`;
+}
+
 /**
  * Simulate a transaction to get accurate gas estimate
  */
@@ -166,9 +170,7 @@ export async function simulateTransaction(
 
     const txBytes = TxRaw.encode(txRaw).finish();
 
-    const simulateUrl = restEndpoint.includes('rest.getbze.com')
-      ? BZE_SIMULATE_PROXY_URL
-      : `${restEndpoint}/cosmos/tx/v1beta1/simulate`;
+    const simulateUrl = cosmosSimulateUrl(restEndpoint);
 
     const response = await fetch(simulateUrl, {
       method: 'POST',
diff --git a/tests/lib/cosmos/fees.test.ts b/tests/lib/cosmos/fees.test.ts
new file mode 100644
index 0000000..83159b2
--- /dev/null
+++ b/tests/lib/cosmos/fees.test.ts
@@ -0,0 +1,13 @@
+import { cosmosSimulateUrl } from '@/lib/cosmos/fees';
+
+describe('cosmosSimulateUrl', () => {
+  it('asks BeeZee REST directly', () => {
+    expect(cosmosSimulateUrl('https://rest.getbze.com')).toBe(
+      'https://rest.getbze.com/cosmos/tx/v1beta1/simulate'
+    );
+    expect(cosmosSimulateUrl('https://rest.getbze.com/')).toBe(
+      'https://rest.getbze.com/cosmos/tx/v1beta1/simulate'
+    );
+    expect(cosmosSimulateUrl('https://rest.getbze.com')).not.toContain('api.vidulum.app');
+  });
+});