diff --git a/package.json b/package.json
index fd0d33f0..584c0bc9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "warp-contracts",
-  "version": "1.4.19",
+  "version": "1.4.20-beta.0",
   "description": "An implementation of the SmartWeave smart contract protocol.",
   "types": "./lib/types/index.d.ts",
   "main": "./lib/cjs/index.js",
diff --git a/src/__tests__/integration/basic/constructor.test.ts b/src/__tests__/integration/basic/constructor.test.ts
index 76a5a43d..19102764 100644
--- a/src/__tests__/integration/basic/constructor.test.ts
+++ b/src/__tests__/integration/basic/constructor.test.ts
@@ -279,6 +279,7 @@ describe('Constructor', () => {
         });
 
         expect((await readExternalContract.viewState({ function: 'read' })).result).toEqual({
+          event: null,
           originalErrorMessages: {},
           originalValidity: {},
           result: 100,
diff --git a/src/__tests__/integration/basic/pst.test.ts b/src/__tests__/integration/basic/pst.test.ts
index 1fe6983a..1574dac3 100644
--- a/src/__tests__/integration/basic/pst.test.ts
+++ b/src/__tests__/integration/basic/pst.test.ts
@@ -12,6 +12,7 @@ import { WarpFactory } from '../../../core/WarpFactory';
 import { LoggerFactory } from '../../../logging/LoggerFactory';
 import { DeployPlugin } from 'warp-contracts-plugin-deploy';
 import { VM2Plugin } from 'warp-contracts-plugin-vm2';
+import { InteractionCompleteEvent } from '../../../core/modules/StateEvaluator';
 
 describe('Testing the Profit Sharing Token', () => {
   let contractSrc: string;
@@ -116,6 +117,39 @@ describe('Testing the Profit Sharing Token', () => {
     expect(resultVM.target).toEqual('uhE-QeYS8i4pmUtnxQyHD7dzXFNaJ9oMK-IM-QPNY6M');
   });
 
+  it('should properly dispatch en event', async () => {
+    let handlerCalled = false;
+    const interactionResult = await pst.writeInteraction({
+      function: 'dispatchEvent'
+    });
+
+    await mineBlock(warp);
+    warp.eventTarget.addEventListener('interactionCompleted', interactionCompleteHandler);
+    await pst.readState();
+
+    expect(handlerCalled).toBeTruthy();
+
+    function interactionCompleteHandler(event: CustomEvent<InteractionCompleteEvent>) {
+      expect(event.type).toEqual('interactionCompleted');
+      expect(event.detail.contractTxId).toEqual(pst.txId());
+      expect(event.detail.caller).toEqual(walletAddress);
+      expect(event.detail.transactionId).toEqual(interactionResult.originalTxId);
+      expect(event.detail.sortKey).not.toBeNull();
+      expect(event.detail.input).not.toBeNull();
+      expect(event.detail.blockHeight).toBeGreaterThan(0);
+      expect(event.detail.blockTimestamp).toBeGreaterThan(0);
+      expect(event.detail.data).toEqual({
+        value1: 'foo',
+        value2: 'bar'
+      });
+      expect(event.detail.input).toEqual({
+        function: 'dispatchEvent'
+      });
+      handlerCalled = true;
+      warp.eventTarget.removeEventListener('interactionCompleted', interactionCompleteHandler);
+    }
+  });
+
   it("should properly evolve contract's source code", async () => {
     expect((await pst.currentState()).balances[walletAddress]).toEqual(555114);
     expect((await pstVM.currentState()).balances[walletAddress]).toEqual(555114);
diff --git a/src/__tests__/integration/data/token-pst.js b/src/__tests__/integration/data/token-pst.js
index f3d1252f..9a0960f6 100644
--- a/src/__tests__/integration/data/token-pst.js
+++ b/src/__tests__/integration/data/token-pst.js
@@ -37,6 +37,16 @@ export async function handle(state, action) {
     return {state};
   }
 
+  if (input.function === 'dispatchEvent') {
+    return {
+      state,
+      event: {
+        value1: 'foo',
+        value2: 'bar'
+      }
+    }
+  }
+
   if (input.function === 'balance') {
     const target = input.target;
     const ticker = state.ticker;
diff --git a/src/core/Warp.ts b/src/core/Warp.ts
index ee68a04b..1258fe38 100644
--- a/src/core/Warp.ts
+++ b/src/core/Warp.ts
@@ -66,6 +66,7 @@ export class Warp {
   readonly testing: Testing;
   kvStorageFactory: KVStorageFactory;
   whoAmI: string;
+  eventTarget: EventTarget;
 
   private readonly plugins: Map<WarpPluginType, WarpPlugin<unknown, unknown>> = new Map();
 
@@ -84,6 +85,7 @@ export class Warp {
         dbLocation: `${DEFAULT_LEVEL_DB_LOCATION}/kv/ldb/${contractTxId}`
       });
     };
+    this.eventTarget = new EventTarget();
   }
 
   static builder(
diff --git a/src/core/modules/StateEvaluator.ts b/src/core/modules/StateEvaluator.ts
index 4aa42d20..0785a810 100644
--- a/src/core/modules/StateEvaluator.ts
+++ b/src/core/modules/StateEvaluator.ts
@@ -243,3 +243,26 @@ export interface EvaluationOptions {
 
   whitelistSources: string[];
 }
+
+// https://github.com/nodejs/node/issues/40678 duh...
+export class CustomEvent<T = unknown> extends Event {
+  readonly detail: T;
+
+  constructor(message, data) {
+    super(message, data);
+    this.detail = data.detail;
+  }
+}
+
+export class InteractionCompleteEvent<Input = unknown, T = unknown> {
+  constructor(
+    readonly contractTxId: string,
+    readonly sortKey: string,
+    readonly transactionId: string,
+    readonly caller: string,
+    readonly input: Input,
+    readonly blockTimestamp: number,
+    readonly blockHeight: number,
+    readonly data: T // eslint-disable-next-line @typescript-eslint/no-empty-function
+  ) {}
+}
diff --git a/src/core/modules/impl/DefaultStateEvaluator.ts b/src/core/modules/impl/DefaultStateEvaluator.ts
index 1dfc20e6..5217eb33 100644
--- a/src/core/modules/impl/DefaultStateEvaluator.ts
+++ b/src/core/modules/impl/DefaultStateEvaluator.ts
@@ -8,7 +8,7 @@ import { GQLNodeInterface, GQLTagInterface } from '../../../legacy/gqlResult';
 import { Benchmark } from '../../../logging/Benchmark';
 import { LoggerFactory } from '../../../logging/LoggerFactory';
 import { indent } from '../../../utils/utils';
-import { EvalStateResult, StateEvaluator } from '../StateEvaluator';
+import { EvalStateResult, StateEvaluator, CustomEvent } from '../StateEvaluator';
 import { ContractInteraction, HandlerApi, InteractionResult } from './HandlerExecutorFactory';
 import { TagsParser } from './TagsParser';
 import { VrfPluginFunctions } from '../../WarpPlugin';
@@ -267,7 +267,8 @@ export abstract class DefaultStateEvaluator implements StateEvaluator {
           throw new Error(`Exception while processing ${JSON.stringify(interaction)}:\n${result.errorMessage}`);
         }
 
-        validity[missingInteraction.id] = result.type === 'ok';
+        const isValidInteraction = result.type === 'ok';
+        validity[missingInteraction.id] = isValidInteraction;
         currentState = result.state;
 
         const toCache = new EvalStateResult(currentState, validity, errorMessages);
@@ -277,6 +278,13 @@ export abstract class DefaultStateEvaluator implements StateEvaluator {
             state: toCache
           };
         }
+
+        const event = result.event;
+        if (event) {
+          warp.eventTarget.dispatchEvent(
+            new CustomEvent(isValidInteraction ? 'interactionCompleted' : 'interactionFailed', { detail: event })
+          );
+        }
       }
 
       if (progressPlugin) {
@@ -358,7 +366,7 @@ export abstract class DefaultStateEvaluator implements StateEvaluator {
     }
   }
 
-  private parseInput(inputTag: GQLTagInterface): unknown | null {
+  private parseInput(inputTag: GQLTagInterface): { function: string } | null {
     try {
       return JSON.parse(inputTag.value);
     } catch (e) {
diff --git a/src/core/modules/impl/HandlerExecutorFactory.ts b/src/core/modules/impl/HandlerExecutorFactory.ts
index 6673d4d5..34680d5b 100644
--- a/src/core/modules/impl/HandlerExecutorFactory.ts
+++ b/src/core/modules/impl/HandlerExecutorFactory.ts
@@ -7,7 +7,7 @@ import { SmartWeaveGlobal } from '../../../legacy/smartweave-global';
 import { Benchmark } from '../../../logging/Benchmark';
 import { LoggerFactory } from '../../../logging/LoggerFactory';
 import { ExecutorFactory } from '../ExecutorFactory';
-import { EvalStateResult, EvaluationOptions } from '../StateEvaluator';
+import { EvalStateResult, EvaluationOptions, InteractionCompleteEvent } from '../StateEvaluator';
 import { JsHandlerApi, KnownErrors } from './handler/JsHandlerApi';
 import { WasmHandlerApi } from './handler/WasmHandlerApi';
 import { normalizeContractSource } from './normalize-source';
@@ -269,15 +269,10 @@ export interface HandlerApi<State> {
   maybeCallStateConstructor(initialState: State, executionContext: ExecutionContext<State>): Promise<State>;
 }
 
-export type HandlerFunction<State, Input, Result> = (
-  state: State,
-  interaction: ContractInteraction<Input>
-) => Promise<HandlerResult<State, Result>>;
-
-// TODO: change to XOR between result and state?
 export type HandlerResult<State, Result> = {
   result: Result;
   state: State;
+  event: InteractionCompleteEvent;
   gasUsed?: number;
 };
 
diff --git a/src/core/modules/impl/handler/JsHandlerApi.ts b/src/core/modules/impl/handler/JsHandlerApi.ts
index af30b8d2..482251fc 100644
--- a/src/core/modules/impl/handler/JsHandlerApi.ts
+++ b/src/core/modules/impl/handler/JsHandlerApi.ts
@@ -1,7 +1,7 @@
 import { GQLNodeInterface } from 'legacy/gqlResult';
 import { ContractDefinition } from '../../../../core/ContractDefinition';
 import { ExecutionContext } from '../../../../core/ExecutionContext';
-import { EvalStateResult } from '../../../../core/modules/StateEvaluator';
+import { EvalStateResult, InteractionCompleteEvent } from '../../../../core/modules/StateEvaluator';
 import { SWBlock, SmartWeaveGlobal, SWTransaction, SWVrf } from '../../../../legacy/smartweave-global';
 import { deepCopy, timeout } from '../../../../utils/utils';
 import { ContractError, ContractInteraction, InteractionData, InteractionResult } from '../HandlerExecutorFactory';
@@ -132,11 +132,11 @@ export class JsHandlerApi<State> extends AbstractContractHandler<State> {
     };
   }
 
-  private async runContractFunction<Input>(
+  private async runContractFunction<Input, Result>(
     executionContext: ExecutionContext<State>,
     interaction: InteractionData<Input>['interaction'],
     state: State
-  ) {
+  ): Promise<InteractionResult<State, Result>> {
     const stateClone = deepCopy(state);
     const { timeoutId, timeoutPromise } = timeout(
       executionContext.evaluationOptions.maxInteractionEvaluationTimeSeconds
@@ -150,10 +150,27 @@ export class JsHandlerApi<State> extends AbstractContractHandler<State> {
 
       if (handlerResult && (handlerResult.state !== undefined || handlerResult.result !== undefined)) {
         await this.swGlobal.kv.commit();
+
+        let interactionEvent: InteractionCompleteEvent = null;
+
+        if (handlerResult.event) {
+          interactionEvent = {
+            contractTxId: this.swGlobal.contract.id,
+            sortKey: this.swGlobal.transaction.sortKey,
+            transactionId: this.swGlobal.transaction.id,
+            caller: interaction.caller,
+            input: interaction.input,
+            blockTimestamp: this.swGlobal.block.timestamp,
+            blockHeight: this.swGlobal.block.height,
+            data: handlerResult.event
+          };
+        }
+
         return {
           type: 'ok' as const,
           result: handlerResult.result,
-          state: handlerResult.state || stateClone
+          state: handlerResult.state || stateClone,
+          event: interactionEvent
         };
       }
 
@@ -167,7 +184,8 @@ export class JsHandlerApi<State> extends AbstractContractHandler<State> {
             type: 'error' as const,
             errorMessage: err.message,
             state: state,
-            result: null
+            result: null,
+            event: null
           };
         case KnownErrors.ConstructorError:
           // if that's the contract that we want to evaluate 'directly' - we need to stop evaluation immediately,
@@ -192,14 +210,16 @@ export class JsHandlerApi<State> extends AbstractContractHandler<State> {
             type: 'error' as const,
             errorMessage: err.message,
             state: state,
-            result: null
+            result: null,
+            event: null
           };
         default:
           return {
             type: 'exception' as const,
             errorMessage: `${(err && err.stack) || (err && err.message) || err}`,
             state: state,
-            result: null
+            result: null,
+            event: null
           };
       }
     } finally {
diff --git a/src/core/modules/impl/handler/WasmHandlerApi.ts b/src/core/modules/impl/handler/WasmHandlerApi.ts
index c5f06b0b..bd7c16d2 100644
--- a/src/core/modules/impl/handler/WasmHandlerApi.ts
+++ b/src/core/modules/impl/handler/WasmHandlerApi.ts
@@ -55,7 +55,8 @@ export class WasmHandlerApi<State> extends AbstractContractHandler<State> {
         type: 'ok',
         result: handlerResult,
         state: this.doGetCurrentState(), // TODO: return only at the end of evaluation and when caching is required
-        gasUsed: this.swGlobal.gasUsed
+        gasUsed: this.swGlobal.gasUsed,
+        event: null
       };
     } catch (e) {
       await this.swGlobal.kv.rollback();
@@ -68,14 +69,16 @@ export class WasmHandlerApi<State> extends AbstractContractHandler<State> {
         return {
           ...result,
           error: e.error,
-          type: 'error'
+          type: 'error',
+          event: null
         };
       } else if (e instanceof NetworkCommunicationError) {
         throw e;
       } else {
         return {
           ...result,
-          type: 'exception'
+          type: 'exception',
+          event: null
         };
       }
     } finally {
diff --git a/tools/contract.ts b/tools/contract.ts
index a79817a5..bc0fd709 100644
--- a/tools/contract.ts
+++ b/tools/contract.ts
@@ -5,14 +5,13 @@ import {JWKInterface} from "arweave/web/lib/wallet";
 import fs from "fs";
 import { ArweaveGQLTxsFetcher } from "../src/core/modules/impl/ArweaveGQLTxsFetcher";
 import { EventEmitter } from "node:events";
-import { EvaluationProgressPlugin } from "warp-contracts-plugin-evaluation-progress";
 
 const logger = LoggerFactory.INST.create('Contract');
 
 //LoggerFactory.use(new TsLogFactory());
 //LoggerFactory.INST.logLevel('error');
 
-LoggerFactory.INST.logLevel('none');
+LoggerFactory.INST.logLevel('debug');
 LoggerFactory.INST.logLevel('info', 'DefaultStateEvaluator');
 
 const eventEmitter = new EventEmitter();
@@ -31,13 +30,12 @@ async function main() {
 
   try {
     const contract = warp
-      .contract("KTzTXT_ANmF84fWEKHzWURD1LWd9QaFR9yfYUwH2Lxw")
+      .contract("BaAP2wyqSiF7Eqw3vcBvVss3C0H8i1NGQFgMY6nGpnk")
       .setEvaluationOptions({
         maxCallDepth: 5,
         maxInteractionEvaluationTimeSeconds: 10000,
         allowBigInt: true,
         unsafeClient: 'skip',
-        internalWrites: true,
       });
     const result = await contract.readState();
     console.dir(result.cachedValue.state, {depth: null});