diff --git a/disk/src/cache.rs b/disk/src/cache.rs
index 301a1ae..c3e3ed6 100644
--- a/disk/src/cache.rs
+++ b/disk/src/cache.rs
@@ -122,10 +122,11 @@ impl PreBinnedQuery {
         let params = netpod::query_params(req.uri.query());
         let ret = PreBinnedQuery {
             patch: PreBinnedPatchCoord {
-                range: NanoRange {
-                    beg: params.get("beg").ok_or(Error::with_msg("missing beg"))?.parse()?,
-                    end: params.get("end").ok_or(Error::with_msg("missing end"))?.parse()?,
+                spec: PreBinnedPatchGridSpec {
+                    patch_t_len: params.get("patch_t_len").ok_or(Error::with_msg("missing patch_t_len"))?.parse()?,
+                    bin_t_len: params.get("bin_t_len").ok_or(Error::with_msg("missing bin_t_len"))?.parse()?,
                 },
+                ix: params.get("patch_ix").ok_or(Error::with_msg("missing patch_ix"))?.parse()?,
             },
             agg_kind: AggKind::DimXBins1,
             channel: Channel {
@@ -195,7 +196,7 @@ pub struct PreBinnedValueStream {
     agg_kind: AggKind,
     node_config: Arc<NodeConfig>,
     open_check_local_file: Option<Pin<Box<dyn Future<Output=Result<tokio::fs::File, std::io::Error>> + Send>>>,
-    fut2: Option<()>,
+    fut2: Option<Pin<Box<dyn Stream<Item=Result<MinMaxAvgScalarBinBatch, Error>> + Send>>>,
 }
 
 impl PreBinnedValueStream {
@@ -215,17 +216,37 @@ impl PreBinnedValueStream {
 
     fn try_setup_fetch_prebinned_higher_res(&mut self) {
         info!("try to find a next better granularity for {:?}", self.patch_coord);
-        let g = self.patch_coord.range.end - self.patch_coord.range.beg;
-        match PreBinnedPatchRange::covering_range(self.patch_coord.range.clone(), 2, 0) {
+        let g = self.patch_coord.spec.bin_t_len;
+        let range = NanoRange {
+            beg: self.patch_coord.patch_beg(),
+            end: self.patch_coord.patch_end(),
+        };
+        match PreBinnedPatchRange::covering_range(range, 2, 0) {
             Some(range) => {
                 let h = range.grid_spec.bin_t_len;
                 assert!(g / h > 1);
                 assert!(g / h < 20);
                 assert!(g % h == 0);
                 info!("FOUND NEXT GRAN  g {}  h {}  ratio {}  mod {}  {:?}", g, h, g/h, g%h, range);
+                let bin_size = range.grid_spec.bin_t_len;
+                let channel = self.channel.clone();
+                let agg_kind = self.agg_kind.clone();
+                let node_config = self.node_config.clone();
+                let mut patch_it = PreBinnedPatchIterator::from_range(range);
+                let s = futures_util::stream::iter(patch_it)
+                .map(move |coord| {
+                    PreBinnedValueFetchedStream::new(coord, channel.clone(), agg_kind.clone(), node_config.clone())
+                })
+                .flatten()
+                .map(move |k| {
+                    info!("ITEM  from sub res bin_size {}   {:?}", bin_size, k);
+                    k
+                });
+                self.fut2 = Some(Box::pin(s));
             }
             None => {
-                info!("NO BETTER GRAN FOUND FOR  g {}", g);
+                error!("TODO  NO BETTER GRAN FOUND FOR  g {}", g);
+                todo!();
             }
         }
     }
@@ -240,7 +261,7 @@ impl Stream for PreBinnedValueStream {
         use Poll::*;
         'outer: loop {
             break if let Some(fut) = self.fut2.as_mut() {
-                todo!()
+                fut.poll_next_unpin(cx)
             }
             else if let Some(fut) = self.open_check_local_file.as_mut() {
                 match fut.poll_unpin(cx) {
@@ -295,12 +316,12 @@ impl PreBinnedValueFetchedStream {
     pub fn new(patch_coord: PreBinnedPatchCoord, channel: Channel, agg_kind: AggKind, node_config: Arc<NodeConfig>) -> Self {
         let nodeix = node_ix_for_patch(&patch_coord, &channel, &node_config.cluster);
         let node = &node_config.cluster.nodes[nodeix as usize];
+        warn!("TODO defining property of a PreBinnedPatchCoord? patchlen + ix? binsize + patchix? binsize + patchsize + patchix?");
         let uri: hyper::Uri = format!(
-            "http://{}:{}/api/1/prebinned?beg={}&end={}&channel_backend={}&channel_name={}&agg_kind={:?}",
+            "http://{}:{}/api/1/prebinned?{}&channel_backend={}&channel_name={}&agg_kind={:?}",
             node.host,
             node.port,
-            patch_coord.range.beg,
-            patch_coord.range.end,
+            patch_coord.to_url_params_strings(),
             channel.backend,
             channel.name,
             agg_kind,
diff --git a/netpod/src/lib.rs b/netpod/src/lib.rs
index 2937803..e28649a 100644
--- a/netpod/src/lib.rs
+++ b/netpod/src/lib.rs
@@ -339,13 +339,26 @@ impl PreBinnedPatchRange {
 
 #[derive(Clone, Debug)]
 pub struct PreBinnedPatchCoord {
-    pub range: NanoRange,
+    pub spec: PreBinnedPatchGridSpec,
+    pub ix: u64,
 }
 
 impl PreBinnedPatchCoord {
 
-    pub fn bs(&self) -> u64 {
-        self.range.end - self.range.beg
+    pub fn bin_t_len(&self) -> u64 {
+        self.spec.bin_t_len
+    }
+
+    pub fn patch_t_len(&self) -> u64 {
+        self.spec.patch_t_len
+    }
+
+    pub fn patch_beg(&self) -> u64 {
+        self.spec.patch_t_len * self.ix
+    }
+
+    pub fn patch_end(&self) -> u64 {
+        self.spec.patch_t_len * (self.ix + 1)
     }
 
 }
@@ -377,10 +390,8 @@ impl Iterator for PreBinnedPatchIterator {
         }
         else {
             let ret = Self::Item {
-                range: NanoRange {
-                    beg: (self.range.offset + self.ix) * self.range.grid_spec.patch_t_len,
-                    end: (self.range.offset + self.ix + 1) * self.range.grid_spec.patch_t_len,
-                },
+                spec: self.range.grid_spec.clone(),
+                ix: self.range.offset + self.ix,
             };
             self.ix += 1;
             Some(ret)