Estimate transaction fee

harmony-one · Sep 27, 2023 · 6f5fa30 · 6f5fa30
1 parent da542f4
commit 6f5fa30
Showing 1 changed file with 14 additions and 2 deletions.
diff --git a/src/modules/payment/index.ts b/src/modules/payment/index.ts
@@ -196,8 +196,20 @@ export class BotPayments {
   }
 
   private async getTransactionFee (): Promise<bn> {
-    const gasPrice = await this.web3.eth.getGasPrice()
-    return bn(gasPrice.toString()).multipliedBy(21000)
+    const estimatedFee = await this.estimateTransferFee()
+    return bn(estimatedFee)
+  }
+
+  private async estimateTransferFee() {
+    const web3 = new Web3(this.rpcURL)
+    const gasPrice = await web3.eth.getGasPrice()
+    const txBody = {
+      from: this.holderAddress,
+      to: this.holderAddress,
+      value: web3.utils.toHex('0'),
+    }
+    const estimatedGas = await web3.eth.estimateGas(txBody)
+    return estimatedGas * +gasPrice
   }
 
   private async transferFunds (