diff --git a/typescript/helloworld/src/app/app.ts b/typescript/helloworld/src/app/app.ts
index b6c8a4a1d..be7e03782 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;
@@ -36,6 +37,7 @@ export class HelloWorldApp<
     const tx = await sender.sendHelloWorld(toDomain, message, {
       ...chainConnection.overrides,
       gasLimit,
+      value,
     });
     const receipt = await tx.wait(chainConnection.confirmations);
 
diff --git a/typescript/infra/scripts/helloworld/kathy.ts b/typescript/infra/scripts/helloworld/kathy.ts
index 411dbd560..91393efc2 100644
--- a/typescript/infra/scripts/helloworld/kathy.ts
+++ b/typescript/infra/scripts/helloworld/kathy.ts
@@ -1,7 +1,11 @@
 import { Gauge, Registry } from 'prom-client';
 
 import { HelloWorldApp } from '@abacus-network/helloworld';
-import { ChainName, Chains } from '@abacus-network/sdk';
+import {
+  ChainName,
+  Chains,
+  InterchainGasCalculator,
+} from '@abacus-network/sdk';
 
 import { submitMetrics } from '../../src/utils/metrics';
 import { sleep } from '../../src/utils/utils';
@@ -33,6 +37,11 @@ async function main() {
   constMetricLabels.abacus_deployment = environment;
   const coreConfig = getCoreEnvironmentConfig(environment);
   const app = await getApp(coreConfig);
+  const multiProvider = await coreConfig.getMultiProvider();
+  const gasCalc = InterchainGasCalculator.fromEnvironment(
+    environment,
+    multiProvider as any,
+  );
   const chains = app.chains() as Chains[];
   const skip = process.env.CHAINS_TO_SKIP?.split(',').filter(
     (skipChain) => skipChain.length > 0,
@@ -47,7 +56,7 @@ async function main() {
 
   let failureOccurred = false;
 
-  const sources = chains.filter((chain) => !skip || !skip.includes(chain));
+  const origins = chains.filter((chain) => !skip || !skip.includes(chain));
 
   // submit frequently so we don't have to wait a super long time for info to get into the metrics
   const metricsInterval = setInterval(() => {
@@ -56,19 +65,19 @@ async function main() {
     );
   }, 1000 * 30);
 
-  for (const source of sources) {
-    for (const destination of sources.filter((d) => d !== source)) {
+  for (const origin of origins) {
+    for (const destination of origins.filter((d) => d !== origin)) {
       const labels = {
-        origin: source,
+        origin,
         remote: destination,
         ...constMetricLabels,
       };
       try {
-        await sendMessage(app, source, destination);
+        await sendMessage(app, origin, destination, gasCalc);
         messagesSendStatus.labels({ ...labels }).set(1);
       } catch (err) {
         console.error(
-          `Error sending message from ${source} to ${destination}, continuing...`,
+          `Error sending message from ${origin} to ${destination}, continuing...`,
           `${err}`.replaceAll('\n', ' ## '),
         );
         failureOccurred = true;
@@ -92,11 +101,21 @@ async function main() {
 
 async function sendMessage(
   app: HelloWorldApp<any>,
-  source: ChainName,
+  origin: ChainName,
   destination: ChainName,
+  gasCalc: InterchainGasCalculator<any>,
 ) {
-  console.log(`Sending message from ${source} to ${destination}`);
-  const receipt = await app.sendHelloWorld(source, destination, `Hello!`);
+  const msg = 'Hello!';
+  const expected = {
+    origin,
+    destination,
+    sender: app.getContracts(origin).router.address,
+    recipient: app.getContracts(destination).router.address,
+    body: msg,
+  };
+  const value = await gasCalc.estimatePaymentForMessage(expected);
+  console.log(`Sending message from ${origin} to ${destination}`);
+  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.ts b/typescript/sdk/src/gas/calculator.ts
index 66a51f40d..a0136e774 100644
--- a/typescript/sdk/src/gas/calculator.ts
+++ b/typescript/sdk/src/gas/calculator.ts
@@ -4,7 +4,11 @@ import { BigNumber, FixedNumber, ethers } from 'ethers';
 import { utils } from '@abacus-network/utils';
 
 import { chainMetadata } from '../consts/chainMetadata';
-import { AbacusCore } from '../core/AbacusCore';
+import {
+  AbacusCore,
+  CoreEnvironment,
+  CoreEnvironmentChain,
+} from '../core/AbacusCore';
 import { MultiProvider } from '../providers/MultiProvider';
 import { ChainName, Remotes } from '../types';
 import { convertDecimalValue, mulBigAndFixed } from '../utils/number';
@@ -86,6 +90,15 @@ export class InterchainGasCalculator<Chain extends ChainName> {
   private paymentEstimateMultiplier: ethers.FixedNumber;
   private messageGasEstimateBuffer: ethers.BigNumber;
 
+  static fromEnvironment<Env extends CoreEnvironment>(
+    env: Env,
+    multiProvider: MultiProvider<CoreEnvironmentChain<Env>>,
+    config?: InterchainGasCalculatorConfig,
+  ): InterchainGasCalculator<CoreEnvironmentChain<Env>> {
+    const core = AbacusCore.fromEnvironment(env, multiProvider);
+    return new InterchainGasCalculator(multiProvider, core, config);
+  }
+
   constructor(
     multiProvider: MultiProvider<Chain>,
     core: AbacusCore<Chain>,
diff --git a/typescript/sdk/src/index.ts b/typescript/sdk/src/index.ts
index 7b9a176b9..2209f4240 100644
--- a/typescript/sdk/src/index.ts
+++ b/typescript/sdk/src/index.ts
@@ -71,7 +71,7 @@ export {
 } from './core/TestCoreApp';
 export { TestCoreDeployer } from './core/TestCoreDeployer';
 
-export { InterchainGasCalculator } from './gas/calculator';
+export { InterchainGasCalculator, ParsedMessage } from './gas/calculator';
 export {
   CoinGeckoTokenPriceGetter,
   TokenPriceGetter,