diff --git a/11.md b/11.md
index 45102d7..e55f6f8 100644
--- a/11.md
+++ b/11.md
@@ -267,6 +267,21 @@ A URL pointing to an image to be used as an icon for the relay. Recommended to b
 }
 ```
 
+### NoH endpoints
+
+URL Paths to NoH endpoints.
+
+```json
+{
+  "noh": {
+    "req": "http://my-relay/__nostr/req",
+    "publish": "http://my-relay/__nostr/pub",
+    "auth": "http://my-relay/__nostr/auth"
+  },
+  ...
+}
+```
+
 ### Examples
 
 As of 2 May 2023 the following command provided these results:
diff --git a/200.md b/200.md
new file mode 100644
index 0000000..212736b
--- /dev/null
+++ b/200.md
@@ -0,0 +1,46 @@
+NIP-200
+=======
+
+Nostr relay communication over HTTP(s) (NoH)
+--------------------------------------------
+
+`draft` `optional` `author:yonle`
+
+This NIP describes the basic of communicating to relays over HTTP(S) requests.
+
+## Communication between clients and relays
+
+Relays may expose NoH endpoints that client could reach. Client may make HTTP requests to each relays endpoint for specified tasks as specified in `noh` field at `/.well-known/nostr.json`. Relays MAY limit number of requests from specific IP/Client/etc.
+
+### From client to relay: getting events and sending event
+
+In `noh` field at `/.well-known/nostr.json`, Client could make a request to `req` or `publish` endpoint.
+
+When fetching events, Client can optionally specify filters directly into the URI search query:
+- `<req>?<filter>`
+
+`<filter>` is a querystrings that determines what events will be received in that request. it can have the following attributes:
+
+```
+ids=<a list of event ids separated by commas>&
+authors=<a list of lowercase pubkeys separated by commas>&
+kinds=<a list of kinds numbers separated by commas>&
+%23<single-letter (a-zA-Z)>=<a list of tag values separated by commas. for %23e — a list of event ids, for %23p — a list of event pubkeys>&
+since=<an integer unix timestamp in seconds, events must be newer than this to pass>&
+until=<an integer unix timestamp in seconds, events must be older than this to pass>&
+limit=<maximum number of events relays SHOULD return in the initial query>
+```
+
+Request URL Examples:
+- `https://my-relay.com/__nostr/req?kinds=0,1&limit=10`
+- `https://my-relay.com/__nostr/req?authors=12345,67890`
+
+To send event to relay, Client will need to make POST request to `publish` endpoint with POST body containing the JSON of the event.
+
+### From relay to client: sending responses and notices
+
+Every NoH response is a JSON body that contain the following JSON field:
+
+- `status`: Request status code in integer. `0` means OK, `1` means invalid request, `2` means relay error.
+- `results`: Array of relay response. Usually contain events requested by client.
+- `notice`: Human readable error.