diff --git a/crates/api/src/routes/tx.rs b/crates/api/src/routes/tx.rs
index 546e160..6a8f75d 100644
--- a/crates/api/src/routes/tx.rs
+++ b/crates/api/src/routes/tx.rs
@@ -8,13 +8,18 @@ use crate::serialise::{WireLog, WireTransaction};
 use axum::extract::{Path, State};
 use axum::routing::get;
 use axum::{Json, Router};
-use indexer_db::{logs, transactions};
+use indexer_db::{blocks, logs, transactions};
 use serde::Serialize;
 
 #[derive(Debug, Serialize)]
 struct TxResponse {
     tx: WireTransaction,
     logs: Vec<WireLog>,
+    /// Unix-seconds chain time of the tx's block. The per-tx row carries no
+    /// timestamp (it lives on `blocks`), so the detail view joins it here —
+    /// otherwise the explorer can't show when an indexed tx happened. 0 if the
+    /// block row is somehow missing (shouldn't occur for an indexed tx).
+    block_timestamp: i64,
 }
 
 async fn detail(
@@ -26,9 +31,14 @@ async fn detail(
         .await?
         .ok_or_else(|| ApiError::NotFound("tx".into()))?;
     let log_rows = logs::for_tx(&state.pool, &hash).await?;
+    let block_timestamp = blocks::get_by_height(&state.pool, tx.block_height)
+        .await?
+        .map(|b| b.timestamp)
+        .unwrap_or(0);
     Ok(Json(TxResponse {
         tx: (&tx).into(),
         logs: log_rows.iter().map(WireLog::from).collect(),
+        block_timestamp,
     }))
 }
 
diff --git a/scripts/smoke.sh b/scripts/smoke.sh
index 048ae77..f97de2c 100755
--- a/scripts/smoke.sh
+++ b/scripts/smoke.sh
@@ -153,7 +153,10 @@ v=$(curl -fsS "$API_BASE/tx/0xtxcccc00000000000000000000000000000000000000000000
 [[ "$v" == "0xfeedfacefeedfacefeedfacefeedfacefeedface" ]] || fail "/tx.from rename broken (got '$v')"
 v=$(curl -fsS "$API_BASE/tx/0xtxcccc00000000000000000000000000000000000000000000000000000000cc" | jq -r '.logs | length')
 [[ "$v" == "2" ]] || fail "/tx logs count != 2 (got $v)"
-ok "/tx/:hash (from_addr->from, logs[2])"
+# block_timestamp joined from blocks (tx cccc is in block 2 @ ts 1700086400)
+v=$(curl -fsS "$API_BASE/tx/0xtxcccc00000000000000000000000000000000000000000000000000000000cc" | jq -r '.block_timestamp')
+[[ "$v" == "1700086400" ]] || fail "/tx block_timestamp != 1700086400 (got '$v')"
+ok "/tx/:hash (from_addr->from, logs[2], block_timestamp)"
 
 # /tx/<unknown> -> 404
 code=$(curl -s -o /dev/null -w '%{http_code}' "$API_BASE/tx/0xdeadbeef")