fix: throttle RPC calls to avoid rate limits

- Reduce MAX_TXS from 50 to 20
- Add 500ms delay between RPC batch requests
- Applies to SOL, USDC, and SPL token history fetchers
- Bump to v0.4.15

Author: ralyodio

package.json

@@ -1,6 +1,6 @@
 {
   "name": "coinpayportal",
-  "version": "0.4.14",
+  "version": "0.4.15",
   "private": true,
   "type": "module",
   "bin": {

packages/sdk/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@profullstack/coinpay",
-  "version": "0.4.14",
+  "version": "0.4.15",
   "description": "CoinPay SDK & CLI — Accept cryptocurrency payments (BTC, ETH, SOL, POL, BCH, USDC) with wallet and swap support",
   "type": "module",
   "main": "./src/index.js",

src/lib/web-wallet/tx-indexer.ts

@@ -85,7 +85,9 @@ const TRANSFER_TOPIC =
   '0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef';
 
 /** Max transactions per scan */
-const MAX_TXS = 50;
+const MAX_TXS = 20;
+const RPC_BATCH_DELAY_MS = 500; // Delay between RPC batches to avoid rate limits
+const rpcDelay = () => new Promise((r) => setTimeout(r, RPC_BATCH_DELAY_MS));
 
 /** Truncate address for logging */
 function truncAddr(addr: string): string {
@@ -849,6 +851,7 @@ async function fetchSOLHistory(
     });
 
     const batchResults = await Promise.allSettled(detailPromises);
+    await rpcDelay(); // Throttle between batches
     for (const r of batchResults) {
       if (r.status === 'fulfilled' && r.value) {
         results.push(r.value);
@@ -997,6 +1000,7 @@ async function fetchUSDCSOLHistory(
     });
 
     const batchResults = await Promise.allSettled(detailPromises);
+    await rpcDelay(); // Throttle between batches
     for (const r of batchResults) {
       if (r.status === 'fulfilled' && r.value) {
         results.push(r.value);
@@ -1656,6 +1660,7 @@ async function fetchUSDTSOLHistory(
       });
 
       const batchResults = await Promise.allSettled(detailPromises);
+    await rpcDelay(); // Throttle between batches
       for (const r of batchResults) {
         if (r.status === 'fulfilled' && r.value) {
           results.push(r.value);