diff --git a/disk/src/binned.rs b/disk/src/binned.rs
index 3e7c5c1..d4704e7 100644
--- a/disk/src/binned.rs
+++ b/disk/src/binned.rs
@@ -1,19 +1,20 @@
-use crate::agg::binnedt::{AggregatableTdim, AggregatorTdim};
+use crate::agg::binnedt::{AggregatableTdim, AggregatorTdim, IntoBinnedT};
 use crate::agg::scalarbinbatch::{MinMaxAvgScalarBinBatch, MinMaxAvgScalarBinBatchAggregator};
 use crate::agg::streams::{Collectable, Collected, StreamItem, ToJsonResult};
 use crate::agg::AggregatableXdim1Bin;
-use crate::binned::scalar::binned_scalar_stream;
+use crate::binned::scalar::{adapter_to_stream_item, binned_stream};
 use crate::binnedstream::{BinnedScalarStreamFromPreBinnedPatches, BinnedStream};
-use crate::cache::BinnedQuery;
+use crate::cache::{BinnedQuery, MergedFromRemotes};
 use crate::channelconfig::{extract_matching_config_entry, read_local_config};
 use crate::frame::makeframe::make_frame;
+use crate::raw::EventsQuery;
 use bytes::Bytes;
 use chrono::{TimeZone, Utc};
 use err::Error;
 use futures_core::Stream;
 use futures_util::StreamExt;
 use netpod::log::*;
-use netpod::{AggKind, BinnedRange, NodeConfigCached};
+use netpod::{AggKind, BinnedRange, NodeConfigCached, PerfOpts, PreBinnedPatchIterator, PreBinnedPatchRange};
 use num_traits::Zero;
 use serde::{Deserialize, Serialize, Serializer};
 use std::pin::Pin;
@@ -233,12 +234,12 @@ pub async fn binned_bytes_for_http(
     info!("binned_bytes_for_http  found config entry {:?}", entry);
     match query.agg_kind() {
         AggKind::DimXBins1 => {
-            let res = binned_scalar_stream(node_config, query).await?;
+            let res = binned_stream(node_config, query, BinnedStreamKindScalar::new()).await?;
             let ret = BinnedBytesForHttpStream::new(res.binned_stream);
             Ok(Box::pin(ret))
         }
         AggKind::DimXBinsN(_) => {
-            let res = binned_scalar_stream(node_config, query).await?;
+            let res = binned_stream(node_config, query, BinnedStreamKindScalar::new()).await?;
             let ret = BinnedBytesForHttpStream::new(res.binned_stream);
             Ok(Box::pin(ret))
         }
@@ -387,8 +388,78 @@ pub async fn binned_json(node_config: &NodeConfigCached, query: &BinnedQuery) ->
 
     // TODO create the matching stream based on AggKind and ConfigEntry.
 
-    let t = binned_scalar_stream(node_config, query).await?;
+    let t = binned_stream(node_config, query, BinnedStreamKindScalar::new()).await?;
     let collected = collect_all(t.binned_stream, t.range.count as u32).await?;
-    let ret = collected.to_json_result();
+    let ret = collected.to_json_result()?;
     Ok(serde_json::to_value(ret)?)
 }
+
+pub trait BinnedStreamKind {
+    type BinnedStreamItem: MakeBytesFrame;
+    type BinnedStreamType: Stream + Send + 'static;
+
+    fn new_binned_from_prebinned(
+        query: &BinnedQuery,
+        range: BinnedRange,
+        pre_range: PreBinnedPatchRange,
+        node_config: &NodeConfigCached,
+    ) -> Result<Self::BinnedStreamType, Error>;
+
+    fn new_binned_from_merged(
+        evq: EventsQuery,
+        perf_opts: PerfOpts,
+        range: BinnedRange,
+        node_config: &NodeConfigCached,
+    ) -> Result<Self::BinnedStreamType, Error>;
+}
+
+pub struct BinnedStreamKindScalar {}
+
+pub struct BinnedStreamKindWave {}
+
+impl BinnedStreamKindScalar {
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+impl BinnedStreamKindWave {
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+impl BinnedStreamKind for BinnedStreamKindScalar {
+    type BinnedStreamItem = Result<StreamItem<BinnedScalarStreamItem>, Error>;
+    type BinnedStreamType = BinnedStream<Self::BinnedStreamItem>;
+
+    fn new_binned_from_prebinned(
+        query: &BinnedQuery,
+        range: BinnedRange,
+        pre_range: PreBinnedPatchRange,
+        node_config: &NodeConfigCached,
+    ) -> Result<Self::BinnedStreamType, Error> {
+        let s = BinnedScalarStreamFromPreBinnedPatches::new(
+            PreBinnedPatchIterator::from_range(pre_range),
+            query.channel().clone(),
+            range.clone(),
+            query.agg_kind().clone(),
+            query.cache_usage().clone(),
+            node_config,
+            query.disk_stats_every().clone(),
+        )?;
+        Ok(BinnedStream::new(Box::pin(s))?)
+    }
+
+    fn new_binned_from_merged(
+        evq: EventsQuery,
+        perf_opts: PerfOpts,
+        range: BinnedRange,
+        node_config: &NodeConfigCached,
+    ) -> Result<Self::BinnedStreamType, Error> {
+        let s = MergedFromRemotes::new(evq, perf_opts, node_config.node_config.cluster.clone())
+            .into_binned_t(range.clone())
+            .map(adapter_to_stream_item);
+        Ok(BinnedStream::new(Box::pin(s))?)
+    }
+}
diff --git a/disk/src/binned/scalar.rs b/disk/src/binned/scalar.rs
index d03b828..29335d1 100644
--- a/disk/src/binned/scalar.rs
+++ b/disk/src/binned/scalar.rs
@@ -1,14 +1,14 @@
-use crate::agg::binnedt::IntoBinnedT;
 use crate::agg::scalarbinbatch::MinMaxAvgScalarBinBatchStreamItem;
 use crate::agg::streams::StreamItem;
-use crate::binned::{BinnedScalarStreamItem, BinnedStreamRes};
-use crate::binnedstream::{BinnedScalarStreamFromPreBinnedPatches, BinnedStream};
-use crate::cache::{BinnedQuery, MergedFromRemotes};
+use crate::binned::{BinnedScalarStreamItem, BinnedStreamKind, BinnedStreamRes};
+use crate::binnedstream::BinnedStream;
+use crate::cache::BinnedQuery;
 use crate::raw::EventsQuery;
 use err::Error;
+use futures_core::Stream;
 use futures_util::StreamExt;
 use netpod::log::*;
-use netpod::{BinnedRange, NodeConfigCached, PerfOpts, PreBinnedPatchIterator, PreBinnedPatchRange};
+use netpod::{BinnedRange, NodeConfigCached, PerfOpts, PreBinnedPatchRange};
 
 pub fn adapter_to_stream_item(
     k: Result<StreamItem<MinMaxAvgScalarBinBatchStreamItem>, Error>,
@@ -30,10 +30,14 @@ pub fn adapter_to_stream_item(
     }
 }
 
-pub async fn binned_scalar_stream(
+pub async fn binned_stream<BK>(
     node_config: &NodeConfigCached,
     query: &BinnedQuery,
-) -> Result<BinnedStreamRes<Result<StreamItem<BinnedScalarStreamItem>, Error>>, Error> {
+    stream_kind: BK,
+) -> Result<BinnedStreamRes<<BK::BinnedStreamType as Stream>::Item>, Error>
+where
+    BK: BinnedStreamKind,
+{
     if query.channel().backend != node_config.node.backend {
         let err = Error::with_msg(format!(
             "backend mismatch  node: {}  requested: {}",
@@ -57,16 +61,8 @@ pub async fn binned_scalar_stream(
                 );
                 return Err(Error::with_msg(msg));
             }
-            let s1 = BinnedScalarStreamFromPreBinnedPatches::new(
-                PreBinnedPatchIterator::from_range(pre_range),
-                query.channel().clone(),
-                range.clone(),
-                query.agg_kind().clone(),
-                query.cache_usage().clone(),
-                node_config,
-                query.disk_stats_every().clone(),
-            )?;
-            let s = BinnedStream::new(Box::pin(s1))?;
+            let s = BK::new_binned_from_prebinned(query, range.clone(), pre_range, node_config)?;
+            let s = BinnedStream::new(Box::pin(s))?;
             let ret = BinnedStreamRes {
                 binned_stream: s,
                 range,
@@ -84,9 +80,7 @@ pub async fn binned_scalar_stream(
                 agg_kind: query.agg_kind().clone(),
             };
             // TODO do I need to set up more transformations or binning to deliver the requested data?
-            let s = MergedFromRemotes::new(evq, perf_opts, node_config.node_config.cluster.clone());
-            let s = s.into_binned_t(range.clone());
-            let s = s.map(adapter_to_stream_item);
+            let s = BK::new_binned_from_merged(evq, perf_opts, range.clone(), node_config)?;
             let s = BinnedStream::new(Box::pin(s))?;
             let ret = BinnedStreamRes {
                 binned_stream: s,
diff --git a/httpret/static/documentation/index.html b/httpret/static/documentation/index.html
index 2cd35d3..5badf48 100644
--- a/httpret/static/documentation/index.html
+++ b/httpret/static/documentation/index.html
@@ -3,11 +3,196 @@
 <head>
     <meta charset="utf-8"/>
     <title>Retrieval Documentation</title>
+    <meta name="keywords" content="PSI, DAQ, Databuffer">
+    <meta name="author" content="Dominik Werder">
     <link rel="shortcut icon" href="about:blank"/>
     <link rel="stylesheet" href="style.css"/>
 </head>
+
 <body>
 <h1>Retrieval 4.0 Documentation</h1>
-<p>Some docs to be shown here...</p>
+
+<h2>HTTP API documentation</h2>
+
+<p>This API follows the common convention that the addition of a key to a json object is not considered a breaking change.</p>
+
+<p>Currently available:</p>
+<ul>
+    <li><a href="#query-binned">Query binned data</a></li>
+</ul>
+
+<a id="query-binned"></a>
+<h2>Query binned data</h2>
+<p><strong>Method:</strong> GET</p>
+<p><strong>URL:</strong> https://data-api.psi.ch/api/4/binned</p>
+<p><strong>Query parameters:</strong></p>
+<ul>
+    <li>channel_backend</li>
+    <li>channel_name</li>
+    <li>beg_date</li>
+    <li>end_date</li>
+    <li>bin_count</li>
+</ul>
+<p><strong>Request header:</strong> "Accept" must be "application/json"</p>
+<p><strong>Example:</strong></p>
+<pre>http://sf-daqbuf-21:8380/api/4/binned?channel_backend=sf-databuffer&channel_name=SLAAR-LSCP4-LAS6891:CH7:1&beg_date=2021-05-21T00:00:00.000Z&end_date=2021-05-21T02:00:00.000Z&bin_count=20</pre>
+<p><strong>Result body example:</strong></p>
+<pre>
+[
+    {
+        "backend": "sf-databuffer",
+        "channels": [
+            "SARES20-LSCP9:CH0:2",
+            "SARES20-LSCP9:CH0:1"
+        ]
+    },
+    {
+        "backend": "hipa-archive",
+        "channels": [],
+        "error": {
+            "code": "Error"  // can be: "Error" | "Timeout" (more to be added in the future)
+        }
+    }
+]
+</pre>
+
+<h4>CURL example:</h4>
+<pre>
+curl -H 'Accept: application/json' 'http://sf-daqbuf-21:8380/api/4/binned?channel_backend=sf-databuffer&channel_name=SLAAR-LSCP4-LAS6891:CH7:1&beg_date=2021-05-21T00:00:00.000Z&end_date=2021-05-21T02:00:00.000Z&bin_count=20'
+</pre>
+<p>Answer:</p>
+<pre>
+{
+    "counts": [
+        458,
+        459,
+        458,
+        459,
+        459,
+        458,
+        459,
+        458,
+        459,
+        459,
+        458,
+        459,
+        458,
+        459,
+        458,
+        459,
+        459,
+        458,
+        459,
+        458,
+        459,
+        458,
+        459,
+        459
+    ],
+    "ts_bin_edges": [
+        "2021-05-21T00:00:00.000Z",
+        "2021-05-21T00:05:00.000Z",
+        "2021-05-21T00:10:00.000Z",
+        "2021-05-21T00:15:00.000Z",
+        "2021-05-21T00:20:00.000Z",
+        "2021-05-21T00:25:00.000Z",
+        "2021-05-21T00:30:00.000Z",
+        "2021-05-21T00:35:00.000Z",
+        "2021-05-21T00:40:00.000Z",
+        "2021-05-21T00:45:00.000Z",
+        "2021-05-21T00:50:00.000Z",
+        "2021-05-21T00:55:00.000Z",
+        "2021-05-21T01:00:00.000Z",
+        "2021-05-21T01:05:00.000Z",
+        "2021-05-21T01:10:00.000Z",
+        "2021-05-21T01:15:00.000Z",
+        "2021-05-21T01:20:00.000Z",
+        "2021-05-21T01:25:00.000Z",
+        "2021-05-21T01:30:00.000Z",
+        "2021-05-21T01:35:00.000Z",
+        "2021-05-21T01:40:00.000Z",
+        "2021-05-21T01:45:00.000Z",
+        "2021-05-21T01:50:00.000Z",
+        "2021-05-21T01:55:00.000Z",
+        "2021-05-21T02:00:00.000Z"
+    ]
+}
+</pre>
+
+
+
+<a name="channel-search-configs"></a>
+<h2>Channel Search, with return of configuration information</h2>
+<p><strong>Method:</strong> POST</p>
+<p><strong>URL:</strong> https://data-api.psi.ch/api/1/channels/config</p>
+<p><strong>Request body:</strong> JSON with search parameters</p>
+<p><strong>Request body outline:</strong></p>
+<pre>
+{
+  "regex":             "[Optional: Regular expression to search in channel name]",
+  "sourceRegex":       "[Optional: Search in sourcename of the channel]",
+  "descriptionRegex":  "[Optional: Search in the channel's description]",
+  "backends":          ["gls-archive", "hipa-archive", "sf-databuffer"]
+}
+</pre>
+<p><strong>Result body example:</strong></p>
+<p>Assuming that "hipa-archive" would be unavailable:</p>
+<pre>
+[
+    {
+        "backend": "sf-databuffer",
+        "channels": [
+            {
+                "backend": "sf-databuffer",
+                "description": "",
+                "name": "SARES20-LSCP9:CH0:2",
+                "shape": [
+                    512
+                ],
+                "source": "tcp://SARES20-CVME-01:9999",
+                "type": "Float32",
+                "unit": ""
+            },
+            {
+                "backend": "sf-databuffer",
+                "description": "",
+                "name": "SARES20-LSCP9:CH0:1",
+                "shape": [
+                    512
+                ],
+                "source": "tcp://SARES20-CVME-01:9999",
+                "type": "Int16",
+                "unit": ""
+            }
+        ]
+    },
+    {
+        "backend": "hipa-archive",
+        "channels": [],
+        "error": {
+            "code": "Error"  // can be: "Error" | "Timeout" (more to be added in the future)
+        }
+    }
+]
+</pre>
+<p>Notes:</p>
+<p>The search constraints are AND'ed together.</p>
+<p>If some backend responds with an error, that error is indicated by the error key in the affected backend (see example above).</p>
+
+
+<h4>CURL example:</h4>
+<pre>
+QUERY='{ "regex": "LSCP9:CH0", "backends": ["sf-databuffer"] }'
+curl -H 'Content-Type: application/json' -H 'Accept: application/json' -d "$QUERY" https://data-api.psi.ch/api/1/channels/config
+</pre>
+
+<h2>Feedback and comments</h2>
+<p>Feedback is very much appreciated:</p>
+<p>dominik.werder@psi.ch</p>
+<p>or please assign me a JIRA ticket.</p>
+
+<div id="footer"></div>
+
+
 </body>
 </html>