diff --git a/apps/pay/src/monitor.ts b/apps/pay/src/monitor.ts
index 12ede7f..ef73af8 100644
--- a/apps/pay/src/monitor.ts
+++ b/apps/pay/src/monitor.ts
@@ -32,10 +32,8 @@ function startChainStream(chain: string) {
   const ac = new AbortController();
   activeStreams.set(chain, ac);
 
-  // No address filter — we watch ALL txs on this chain and match server-side
-  // against our address map. This is necessary because addresses change as
-  // new payments are created.
-  const query = { chain };
+  // Watch all txs for this coin and match server-side against our address map.
+  const query = { crypto: chain };
   const q = Buffer.from(JSON.stringify(query)).toString("base64");
   const url = `${SOCK_API}/sse?q=${q}`;