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prediction_market_ohlcv
Read-only

Historical odds/volume candles for a Polymarket market.

When to use:

  • Current odds / implied probability, price history, and recent probability changes on a specific market.

Key fields:

  • Close is the share price for the displayed outcome side.

  • In binary markets, Yes and No shares are complementary and sum to about $1.

Pitfalls:

  • Each response is for one exact marketId — do not mix dates or prices across different markets.

  • If no candles are returned for the requested window, say so directly — do not estimate.

Prerequisites: If marketId is unknown, call prediction_market_lookup first.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
requestYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / properties / request / anyOf
      Previous value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "description": "Request for historical prediction market OHLCV.",
-    "properties": {
-      "dateRange": {
-        "anyOf": [
-          {
-            "description": "Date range via tokens or dates.\nTokens: NOW, XMIN_AGO, XD_AGO, XH_AGO; THIS_YEAR_START, THIS_QUARTER_START, THIS_MONTH_START, THIS_WEEK_START, TODAY_START; LAST_WEEK_START/END, LAST_MONTH_START/END, LAST_QUARTER_START/END, LAST_YEAR_START/END.\nWeek starts Monday. Quarters are calendar. Dates: YYYY-MM-DD or ___-MM-DD (year omitted).\nPlease check detailed system instructions for more information.",
-            "properties": {
-              "from": {
-                "description": "Start value: token (see above) or date (YYYY-MM-DD or ___-MM-DD).",
-                "type": "string"
-              },
-              "to": {
-                "description": "End value: token (see above) or date (YYYY-MM-DD or ___-MM-DD).",
-                "type": "string"
-              }
-            },
-            "required": [
-              "from",
-              "to"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null,
-        "description": "Optional date range for OHLCV. Defaults to the last 30 days when omitted."
-      },
-      "marketId": {
-        "description": "Numeric Polymarket market ID (e.g. '654412'). Obtain this from the prediction_market_screener tool.",
-        "maxLength": 100,
-        "minLength": 1,
-        "type": "string"
-      },
-      "orderBy": {
-        "anyOf": [
-          {
-            "enum": [
-              "period_start",
-              "volume_usd",
-              "trade_count"
-            ],
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null,
-        "description": "Sort field. Pass an exact value above or None for default ('period_start')."
-      },
-      "orderByDirection": {
-        "default": "DESC",
-        "description": "Sort direction: 'ASC' or 'DESC' (case-insensitive).",
-        "enum": [
-          "ASC",
-          "DESC",
-          "asc",
-          "desc"
-        ],
-        "type": "string"
-      },
-      "page": {
-        "default": 1,
-        "description": "Page number for paginated results.",
-        "minimum": 1,
-        "type": "integer"
-      }
-    },
-    "required": [
-      "marketId"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "description": "Request for historical prediction market OHLCV.",
+    "properties": {
+      "dateRange": {
+        "anyOf": [
+          {
+            "description": "Date range via tokens or dates.\nTokens: NOW, ALL_TIME, XMIN_AGO, XD_AGO, XH_AGO; THIS_YEAR_START, THIS_QUARTER_START, THIS_MONTH_START, THIS_WEEK_START, TODAY_START; LAST_WEEK_START/END, LAST_MONTH_START/END, LAST_QUARTER_START/END, LAST_YEAR_START/END.\nALL_TIME is full history. It resolves to 2009-01-03. Use ALL_TIME instead of a very large day count.\nWeek starts Monday. Quarters are calendar. Dates: YYYY-MM-DD or ___-MM-DD (year omitted).\nPlease check detailed system instructions for more information.",
+            "properties": {
+              "from": {
+                "description": "Start value: token (see above) or date (YYYY-MM-DD or ___-MM-DD).",
+                "type": "string"
+              },
+              "to": {
+                "description": "End value: token (see above) or date (YYYY-MM-DD or ___-MM-DD).",
+                "type": "string"
+              }
+            },
+            "required": [
+              "from",
+              "to"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null,
+        "description": "Optional date range for OHLCV. Defaults to the last 30 days when omitted."
+      },
+      "marketId": {
+        "description": "Numeric Polymarket market ID (e.g. '654412'). Obtain this from the prediction_market_screener tool.",
+        "maxLength": 100,
+        "minLength": 1,
+        "type": "string"
+      },
+      "orderBy": {
+        "anyOf": [
+          {
+            "enum": [
+              "period_start",
+              "volume_usd",
+              "trade_count"
+            ],
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null,
+        "description": "Sort field. Pass an exact value above or None for default ('period_start')."
+      },
+      "orderByDirection": {
+        "default": "DESC",
+        "description": "Sort direction: 'ASC' or 'DESC' (case-insensitive).",
+        "enum": [
+          "ASC",
+          "DESC",
+          "asc",
+          "desc"
+        ],
+        "type": "string"
+      },
+      "page": {
+        "default": 1,
+        "description": "Page number for paginated results.",
+        "minimum": 1,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "marketId"
+    ],
+    "type": "object"
+  }
+]
  2. Changed1 schema field changed
    • changedInput schema / properties / request / anyOf
      Previous value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "description": "Request for historical prediction market OHLCV.",
-    "properties": {
-      "dateRange": {
-        "anyOf": [
-          {
-            "description": "Date range via tokens or dates.\nTokens: NOW, XMIN_AGO, XD_AGO, XH_AGO; THIS_YEAR_START, THIS_QUARTER_START, THIS_MONTH_START, THIS_WEEK_START, TODAY_START; LAST_WEEK_START/END, LAST_MONTH_START/END, LAST_QUARTER_START/END, LAST_YEAR_START/END.\nWeek starts Monday. Quarters are calendar. Dates: YYYY-MM-DD or ___-MM-DD (year omitted).\nPlease check detailed system instructions for more information.",
-            "properties": {
-              "from": {
-                "description": "Start value: token (see above) or date (YYYY-MM-DD or ___-MM-DD).",
-                "type": "string"
-              },
-              "to": {
-                "description": "End value: token (see above) or date (YYYY-MM-DD or ___-MM-DD).",
-                "type": "string"
-              }
-            },
-            "required": [
-              "from",
-              "to"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null,
-        "description": "Optional date range for OHLCV. Defaults to the last 30 days when omitted."
-      },
-      "marketId": {
-        "description": "Numeric Polymarket market ID (e.g. '654412'). Obtain this from the prediction_market_screener tool.",
-        "maxLength": 100,
-        "minLength": 1,
-        "type": "string"
-      },
-      "orderBy": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null,
-        "description": "Optional sort field. Common fields: periodStart, volumeUsd, tradeCount."
-      },
-      "orderByDirection": {
-        "default": "desc",
-        "description": "Sort direction when orderBy is provided.",
-        "enum": [
-          "asc",
-          "desc",
-          "ASC",
-          "DESC"
-        ],
-        "type": "string"
-      },
-      "page": {
-        "default": 1,
-        "description": "Page number for paginated results.",
-        "minimum": 1,
-        "type": "integer"
-      }
-    },
-    "required": [
-      "marketId"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "description": "Request for historical prediction market OHLCV.",
+    "properties": {
+      "dateRange": {
+        "anyOf": [
+          {
+            "description": "Date range via tokens or dates.\nTokens: NOW, XMIN_AGO, XD_AGO, XH_AGO; THIS_YEAR_START, THIS_QUARTER_START, THIS_MONTH_START, THIS_WEEK_START, TODAY_START; LAST_WEEK_START/END, LAST_MONTH_START/END, LAST_QUARTER_START/END, LAST_YEAR_START/END.\nWeek starts Monday. Quarters are calendar. Dates: YYYY-MM-DD or ___-MM-DD (year omitted).\nPlease check detailed system instructions for more information.",
+            "properties": {
+              "from": {
+                "description": "Start value: token (see above) or date (YYYY-MM-DD or ___-MM-DD).",
+                "type": "string"
+              },
+              "to": {
+                "description": "End value: token (see above) or date (YYYY-MM-DD or ___-MM-DD).",
+                "type": "string"
+              }
+            },
+            "required": [
+              "from",
+              "to"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null,
+        "description": "Optional date range for OHLCV. Defaults to the last 30 days when omitted."
+      },
+      "marketId": {
+        "description": "Numeric Polymarket market ID (e.g. '654412'). Obtain this from the prediction_market_screener tool.",
+        "maxLength": 100,
+        "minLength": 1,
+        "type": "string"
+      },
+      "orderBy": {
+        "anyOf": [
+          {
+            "enum": [
+              "period_start",
+              "volume_usd",
+              "trade_count"
+            ],
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null,
+        "description": "Sort field. Pass an exact value above or None for default ('period_start')."
+      },
+      "orderByDirection": {
+        "default": "DESC",
+        "description": "Sort direction: 'ASC' or 'DESC' (case-insensitive).",
+        "enum": [
+          "ASC",
+          "DESC",
+          "asc",
+          "desc"
+        ],
+        "type": "string"
+      },
+      "page": {
+        "default": 1,
+        "description": "Page number for paginated results.",
+        "minimum": 1,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "marketId"
+    ],
+    "type": "object"
+  }
+]
  3. Changed3 schema fields changed
    • removedInput schema / $defs
      Removed value: -{
-  "DateRange": {
-    "description": "Date range via tokens or dates.\nTokens: NOW, XMIN_AGO, XD_AGO, XH_AGO; THIS_YEAR_START, THIS_QUARTER_START, THIS_MONTH_START, THIS_WEEK_START, TODAY_START; LAST_WEEK_START/END, LAST_MONTH_START/END, LAST_QUARTER_START/END, LAST_YEAR_START/END.\nWeek starts Monday. Quarters are calendar. Dates: YYYY-MM-DD or ___-MM-DD (year omitted).\nPlease check detailed system instructions for more information.",
-    "properties": {
-      "from": {
-        "description": "Start value: token (see above) or date (YYYY-MM-DD or ___-MM-DD).",
-        "type": "string"
-      },
-      "to": {
-        "description": "End value: token (see above) or date (YYYY-MM-DD or ___-MM-DD).",
-        "type": "string"
-      }
-    },
-    "required": [
-      "from",
-      "to"
-    ],
-    "type": "object"
-  },
-  "PredictionMarketOhlcvRequest": {
-    "description": "Request for historical prediction market OHLCV.",
-    "properties": {
-      "dateRange": {
-        "anyOf": [
-          {
-            "$ref": "#/$defs/DateRange"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null,
-        "description": "Optional date range for OHLCV. Defaults to the last 30 days when omitted."
-      },
-      "marketId": {
-        "description": "Numeric Polymarket market ID (e.g. '654412'). Obtain this from the prediction_market_screener tool.",
-        "maxLength": 100,
-        "minLength": 1,
-        "type": "string"
-      },
-      "orderBy": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null,
-        "description": "Optional sort field. Common fields: periodStart, volumeUsd, tradeCount."
-      },
-      "orderByDirection": {
-        "default": "desc",
-        "description": "Sort direction when orderBy is provided.",
-        "enum": [
-          "asc",
-          "desc",
-          "ASC",
-          "DESC"
-        ],
-        "type": "string"
-      },
-      "page": {
-        "default": 1,
-        "description": "Page number for paginated results.",
-        "minimum": 1,
-        "type": "integer"
-      }
-    },
-    "required": [
-      "marketId"
-    ],
-    "type": "object"
-  }
-}
    • addedInput schema / additionalProperties
      Added value: +false
    • changedInput schema / properties / request / anyOf
      Previous value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "$ref": "#/$defs/PredictionMarketOhlcvRequest"
-  }
-]New value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "description": "Request for historical prediction market OHLCV.",
+    "properties": {
+      "dateRange": {
+        "anyOf": [
+          {
+            "description": "Date range via tokens or dates.\nTokens: NOW, XMIN_AGO, XD_AGO, XH_AGO; THIS_YEAR_START, THIS_QUARTER_START, THIS_MONTH_START, THIS_WEEK_START, TODAY_START; LAST_WEEK_START/END, LAST_MONTH_START/END, LAST_QUARTER_START/END, LAST_YEAR_START/END.\nWeek starts Monday. Quarters are calendar. Dates: YYYY-MM-DD or ___-MM-DD (year omitted).\nPlease check detailed system instructions for more information.",
+            "properties": {
+              "from": {
+                "description": "Start value: token (see above) or date (YYYY-MM-DD or ___-MM-DD).",
+                "type": "string"
+              },
+              "to": {
+                "description": "End value: token (see above) or date (YYYY-MM-DD or ___-MM-DD).",
+                "type": "string"
+              }
+            },
+            "required": [
+              "from",
+              "to"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null,
+        "description": "Optional date range for OHLCV. Defaults to the last 30 days when omitted."
+      },
+      "marketId": {
+        "description": "Numeric Polymarket market ID (e.g. '654412'). Obtain this from the prediction_market_screener tool.",
+        "maxLength": 100,
+        "minLength": 1,
+        "type": "string"
+      },
+      "orderBy": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null,
+        "description": "Optional sort field. Common fields: periodStart, volumeUsd, tradeCount."
+      },
+      "orderByDirection": {
+        "default": "desc",
+        "description": "Sort direction when orderBy is provided.",
+        "enum": [
+          "asc",
+          "desc",
+          "ASC",
+          "DESC"
+        ],
+        "type": "string"
+      },
+      "page": {
+        "default": 1,
+        "description": "Page number for paginated results.",
+        "minimum": 1,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "marketId"
+    ],
+    "type": "object"
+  }
+]
  4. Added

TDQS

A4.1/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true, openWorldHint=true, destructiveHint=false, so the safety profile is covered. The description adds genuinely useful behavior beyond that: the no-mix-markets constraint and the instruction to report empty candle windows rather than estimating, which shapes agent behavior in edge cases. It omits pagination/rate-limit behavior.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with the core purpose in sentence one, then grouped into When to use / Key fields / Pitfalls / Prerequisites with no filler. Slightly long for the amount of operational content, but every section carries signal.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, so return-format explanation is rightly absent, but the description still adds interpretational value for the Close field and binary-market complementarity. Combined with prerequisites and pitfalls, an agent has enough to call it correctly; only sort/pagination semantics are left implicit.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Stated schema description coverage is 0% for the single top-level 'request' wrapper, so the description is expected to compensate. It does add the marketId prerequisite and warns not to mix markets, but says nothing about dateRange defaults, page, orderBy, or orderByDirection. Partial compensation only.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The opening line names a specific verb and resource ('Historical odds/volume candles for a Polymarket market'), which immediately distinguishes it from siblings like prediction_market_orderbook, prediction_market_trades, and prediction_market_lookup. It also states the conceptual scope (current odds, implied probability, price history) rather than restating the tool name.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is an explicit 'When to use' block plus a prerequisite that routes the agent to prediction_market_lookup when marketId is unknown, which is real routing guidance. It stops short of saying when NOT to use it (e.g. versus prediction_market_orderbook for live depth), so no full when/when-not/alternatives statement.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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