Merge pull request #11 from atmoner/dev

Add tip Gas/fee

src/tips/manageFee.md

@@ -0,0 +1,56 @@
+---
+home: false
+title: Manage Gas/Fee
+author: atmon3r
+copyright: false
+---
+
+## Manage Fees
+This example calculates fees/gas from a simple send message
+
+```js
+import {
+ defaultRegistryTypes,
+ GasPrice,
+ calculateFee,
+} from "@cosmjs/stargate";
+
+
+// 1. Create message 
+const foundMsgType = defaultRegistryTypes.find(
+ (element) => element[0] === "/cosmos.bank.v1beta1.MsgSend"
+)
+const amount = coins(1000000, 'uatom')
+const finalMsg = { 
+ typeUrl: foundMsgType[0], 
+ value: foundMsgType[1].fromPartial({
+ fromAddress: '',
+ toAddress: '',
+ amount: amount,
+ }),
+}
+
+// 2. Calcul gas estimation
+const gasEstimation = await signer.client.simulate(
+ '', // Signer address
+ [finalMsg],
+ 'Send Tokens'
+)
+
+// 3. Calcul Fee from gas estimation
+const usedFee = calculateFee(
+ Math.round(gasEstimation * 1.3), // gasEstimation * feeMultiplier
+ GasPrice.fromString('0.075uatom') // Set default Gas price
+); 
+
+// 4. Set Fee + Gas in variable
+const feeAmount = coins(usedFee.amount[0].amount, 'uatom');
+let finalFee = {
+ amount: feeAmount,
+ gas: usedFee.gas,
+ //granter: this.finalFeeGranter,
+}
+
+// Display it =)
+console.log(finalFee)
+```