Previous value: -"Present when an ES/MES (or NQ/MNQ) symbol was asked: the futures basis every price here was moved by; null when the day has no measured basis and the answer is the index's"New value: +"Present when an ES/MES (or NQ/MNQ, RTY/M2K) symbol was asked: the futures basis every price here was moved by; null when the day has no measured basis and the answer is the index's"

Previous value: -"The index whose book was moved: SPX or NDX"New value: +"The index whose book was moved: SPX, NDX or RUT"

Added value: +{
+  "description": "The time this answer's data is true as of, ISO 8601 with the ET offset: a finished session's close (13:00 on an early close), the minute a ladder was read at, or the source's own build stamp. Null when the source states none.",
+  "type": [
+    "string",
+    "null"
+  ]
+}

Added value: +{
+  "description": "Version of the FirmTape MCP server that produced this answer",
+  "type": "string"
+}

Removed value: -{
-  "description": "[low, high] band where dealer hedging tends to pin price",
-  "items": {
-    "type": [
-      "number",
-      "null"
-    ]
-  },
-  "maxItems": 2,
-  "minItems": 2,
-  "type": "array"
-}

Previous value: -[
-  "zero_gamma_flip",
-  "call_resistance",
-  "put_support",
-  "hold_band"
-]New value: +[
+  "zero_gamma_flip",
+  "call_resistance",
+  "put_support"
+]

Previous value: -[
-  "summary",
-  "from",
-  "to",
-  "sessions",
-  "movement",
-  "missing"
-]New value: +[
+  "summary",
+  "from",
+  "to",
+  "sessions",
+  "movement",
+  "missing",
+  "data_as_of",
+  "server_version"
+]

Added value: +{
+  "description": "Optional dated contract for a future symbol. Default is the front contract; in the two weeks before a roll the next one is measured too.",
+  "examples": [
+    "ESZ26",
+    "ESH27"
+  ],
+  "pattern": "^M?(ES|NQ)[FGHJKMNQUVXZ]\\d{1,2}$",
+  "type": "string"
+}

Added value: +{
+  "description": "SPX (default), or ES / MES: each session's levels and close moved by that session's ES basis at its close. Sessions without a measured basis are left out and listed in no_basis; with fewer than two measured, the answer is SPX's and says so.",
+  "examples": [
+    "SPX",
+    "ES",
+    "MES"
+  ],
+  "type": "string"
+}

Added value: +{
+  "description": "Present when an ES/MES (or NQ/MNQ) symbol was asked: the futures basis every price here was moved by; null when the day has no measured basis and the answer is the index's",
+  "properties": {
+    "at": {
+      "description": "ET minute the basis belongs to",
+      "type": "string"
+    },
+    "contract": {
+      "description": "The quarterly contract, e.g. ESZ26",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "contracts": {
+      "description": "History only: the contracts the window's sessions were priced as",
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "expiry": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "future": {
+      "type": "string"
+    },
+    "index": {
+      "description": "The index whose book was moved: SPX or NDX",
+      "type": "string"
+    },
+    "method": {
+      "type": "string"
+    },
+    "name": {
+      "type": "string"
+    },
+    "passes": {
+      "description": "Basis passes measured that day",
+      "type": "integer"
+    },
+    "points": {
+      "description": "Future minus index, index points, added to every level, strike and spot",
+      "type": "number"
+    },
+    "source": {
+      "format": "uri",
+      "type": "string"
+    }
+  },
+  "type": [
+    "object",
+    "null"
+  ]
+}

Added value: +{
+  "description": "ES only: sessions in the window with no measured basis, left out of the ES series rather than shown at SPX prices",
+  "items": {
+    "description": "Trading day, YYYY-MM-DD",
+    "type": "string"
+  },
+  "type": "array"
+}

Added value: +{
+  "description": "Present when a future was asked and its basis is not measured for the day",
+  "type": "string"
+}

Added value: +{
+  "description": "Present when a future was asked but the day has no measured basis, so the answer is SPX's",
+  "type": "string"
+}

Added value: +{
+  "description": "ES only: the session's basis at its close, index points, added to its levels and close",
+  "type": "number"
+}

Previous value: -"Dealer-positioning levels in SPX index points; null when the session did not produce one"New value: +"Dealer-positioning levels in SPX index points (in ES points when `symbol` is ES or MES); null when the session did not produce one"

Added value: +{
+  "description": "What the prices are in: SPX, or ES / MES when asked and the day's basis is measured",
+  "type": "string"
+}