diff --git a/typescript/helloworld/src/app/app.ts b/typescript/helloworld/src/app/app.ts
index 98ea02d9f..206f6bfa2 100644
--- a/typescript/helloworld/src/app/app.ts
+++ b/typescript/helloworld/src/app/app.ts
@@ -1,4 +1,4 @@
-import { ethers } from 'ethers';
+import { BigNumber, ethers } from 'ethers';
 
 import { TypedListener } from '@abacus-network/core/dist/common';
 import {
@@ -19,6 +19,7 @@ export class HelloWorldApp<
     from: From,
     to: Remotes<Chain, From>,
     message: string,
+    value: BigNumber,
     receiveHandler?: TypedListener<ReceivedHelloWorldEvent>,
   ): Promise<ethers.ContractReceipt> {
     const sender = this.getContracts(from).router;
@@ -29,14 +30,16 @@ export class HelloWorldApp<
     const estimated = await sender.estimateGas.sendHelloWorld(
       toDomain,
       message,
-      chainConnection.overrides,
+      { ...chainConnection.overrides, value },
     );
     const gasLimit = estimated.mul(12).div(10);
 
     const tx = await sender.sendHelloWorld(toDomain, message, {
       ...chainConnection.overrides,
       gasLimit,
+      value,
     });
+    console.log(tx);
     const receipt = await tx.wait(chainConnection.confirmations);
 
     if (receiveHandler) {
diff --git a/typescript/infra/config/environments/mainnet/chains.ts b/typescript/infra/config/environments/mainnet/chains.ts
index 746a8031d..7c2c18c5d 100644
--- a/typescript/infra/config/environments/mainnet/chains.ts
+++ b/typescript/infra/config/environments/mainnet/chains.ts
@@ -8,7 +8,7 @@ export const mainnetConfigs: ChainMap<any, IChainConnection> = {
   bsc: {
     ...chainConnectionConfigs.bsc,
     overrides: {
-      gasPrice: 7 * 10 ** 9,
+      gasPrice: 7 * 10 ** 9, // 7 gwei
     },
   },
   avalanche: chainConnectionConfigs.avalanche,
@@ -16,9 +16,9 @@ export const mainnetConfigs: ChainMap<any, IChainConnection> = {
     ...chainConnectionConfigs.polygon,
     confirmations: 3,
     overrides: {
-      maxFeePerGas: 100 * 10 ** 9, // gwei
-      maxPriorityFeePerGas: 40 * 10 ** 9, // gwei
-      // gasPrice: 50 * 10 ** 9, // gwei
+      maxFeePerGas: 100 * 10 ** 9, // 100 gwei
+      maxPriorityFeePerGas: 40 * 10 ** 9, // 40 gwei
+      // gasPrice: 50 * 10 ** 9, // 50 gwei
     },
   },
   celo: chainConnectionConfigs.celo,
diff --git a/typescript/infra/scripts/helloworld/kathy.ts b/typescript/infra/scripts/helloworld/kathy.ts
index 25a49f71c..93a84726e 100644
--- a/typescript/infra/scripts/helloworld/kathy.ts
+++ b/typescript/infra/scripts/helloworld/kathy.ts
@@ -1,3 +1,4 @@
+import { BigNumber } from 'ethers';
 import { Gauge, Registry } from 'prom-client';
 
 import { HelloWorldApp } from '@abacus-network/helloworld';
@@ -106,8 +107,14 @@ async function sendMessage(
   gasCalc: InterchainGasCalculator<any>,
 ) {
   const msg = 'Hello!';
+  const expectedHandleGas = BigNumber.from(100_000);
+  const value = await gasCalc.estimatePaymentForHandleGas(
+    origin,
+    destination,
+    expectedHandleGas,
+  );
   console.log(`Sending message from ${origin} to ${destination}`);
-  const receipt = await app.sendHelloWorld(origin, destination, msg);
+  const receipt = await app.sendHelloWorld(origin, destination, msg, value);
   console.log(JSON.stringify(receipt.events || receipt.logs));
 }
 
diff --git a/typescript/sdk/src/gas/calculator.test.ts b/typescript/sdk/src/gas/calculator.test.ts
index 0fbfb78fd..7e05288c2 100644
--- a/typescript/sdk/src/gas/calculator.test.ts
+++ b/typescript/sdk/src/gas/calculator.test.ts
@@ -1,9 +1,7 @@
 import { expect } from 'chai';
-import { BigNumber, ethers } from 'ethers';
+import { BigNumber } from 'ethers';
 import sinon from 'sinon';
 
-import { utils } from '@abacus-network/utils';
-
 import { Chains } from '../consts/chains';
 import { AbacusCore } from '../core/AbacusCore';
 import { CoreContracts } from '../core/contracts';
@@ -129,6 +127,7 @@ describe('InterchainGasCalculator', () => {
     });
   });
 
+  /*
   describe('estimatePaymentForMessage', () => {
     it('estimates origin token payment from a specified message', async () => {
       // Set destination gas price to 10 wei
@@ -165,6 +164,7 @@ describe('InterchainGasCalculator', () => {
       expect(estimatedPayment.toNumber()).to.equal(1_000_000);
     });
   });
+  */
 
   describe('convertBetweenTokens', () => {
     const destinationWei = BigNumber.from('1000');
diff --git a/typescript/sdk/src/gas/calculator.ts b/typescript/sdk/src/gas/calculator.ts
index a09a83a89..effed269f 100644
--- a/typescript/sdk/src/gas/calculator.ts
+++ b/typescript/sdk/src/gas/calculator.ts
@@ -184,12 +184,13 @@ export class InterchainGasCalculator<Chain extends ChainName> {
    * denominated in the native token of the origin chain. The gas used by the message's
    * recipient handler function is estimated in an eth_estimateGas call to the
    * destination chain, and is then used to calculate the payment using
+   * Currently made private as it does not work properly for Arbitrum.
    * {@link estimatePaymentForHandleGasAmount}.
    * @param message The parsed message to estimate payment for.
    * @returns An estimated amount of origin chain tokens to cover gas costs of the
    * message on the destination chain.
    */
-  async estimatePaymentForMessage<Destination extends Chain>(
+  protected async estimatePaymentForMessage<Destination extends Chain>(
     message: ParsedMessage<Chain, Destination>,
   ): Promise<BigNumber> {
     const handleGas = await this.estimateGasForHandle(message);
@@ -289,7 +290,7 @@ export class InterchainGasCalculator<Chain extends ChainName> {
       from: destinationInbox.address,
       data: handlerInterface.encodeFunctionData('handle', [
         chainMetadata[message.origin].id,
-        message.sender,
+        utils.addressToBytes32(message.sender),
         message.body,
       ]),
     });