1 files changed, 5 insertions, 0 deletions
diff --git a/src/types.ts b/src/types.ts
index 1b70d950b..8edb9ce5e 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -275,3 +275,8 @@ export interface ContractInstance {
 export interface Artifact {
     networks: {[networkId: number]: any};
 }
+
+export interface ZeroExEvent {
+    watch: (eventCallback: EventCallback) => void;
+    stopWatchingAsync: () => Promise<void>;
+}