Nansen

by io.github.nansen-ai

Overview Discussions Admin

Finding prediction market top holders

prediction_market_top_holders

Read-only

Largest current holders for a Polymarket market.

Key fields:

Positions are share balances, not USD notional.
Position Value USD is current marked value, not payout at resolution.
Side Held is the share side currently held.

Pitfalls:

The visible holder table is the source of truth for holder-side concentration — do not infer risk, max loss, or potential profit unless the tool output explicitly provides it.
Output summary is based only on shown rows, not the entire holder table.
Large visible positions or labels do not by themselves identify smart money unless Nansen smart-money-labelled data supports it.

Prerequisites: If marketId is unknown, call prediction_market_lookup first.

Input Schema

Name	Required	Description	Default
`request`	Yes	Request for prediction market top holders.

Output Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed6 schema fields changedOct 28, 2026

addedInput schema / properties / request / additionalProperties
```
Added value: +false
```

removedInput schema / properties / request / anyOf

Removed value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "description": "Request for prediction market top holders.",
-    "properties": {
-      "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": [
-              "position_size",
-              "unrealized_pnl_usd",
-              "avg_entry_price"
-            ],
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "default": null,
-        "description": "Sort field. Pass an exact value above or None for default ('position_size')."
-      },
-      "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"
-  }
-]

addedInput schema / properties / request / description

Added value: +"Request for prediction market top holders."

addedInput schema / properties / request / properties

Added value: +{
+  "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": [
+          "position_size",
+          "unrealized_pnl_usd",
+          "avg_entry_price"
+        ],
+        "type": "string"
+      },
+      {
+        "type": "null"
+      }
+    ],
+    "default": null,
+    "description": "Sort field. Pass an exact value above or None for default ('position_size')."
+  },
+  "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"
+  }
+}

addedInput schema / properties / request / required
```
Added value: +[
+  "marketId"
+]
```
addedInput schema / properties / request / type
```
Added value: +"object"
```

Changed1 schema field changedMay 29, 2026

changedInput schema / properties / request / anyOf

Previous value: -[
-  {
-    "additionalProperties": true,
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "description": "Request for prediction market top holders.",
-    "properties": {
-      "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: positionSize, unrealizedPnlUsd, avgEntryPrice."
-      },
-      "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 prediction market top holders.",
+    "properties": {
+      "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": [
+              "position_size",
+              "unrealized_pnl_usd",
+              "avg_entry_price"
+            ],
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "default": null,
+        "description": "Sort field. Pass an exact value above or None for default ('position_size')."
+      },
+      "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"
+  }
+]

Changed3 schema fields changedMay 19, 2026

removedInput schema / $defs

Removed value: -{
-  "PredictionMarketTopHoldersRequest": {
-    "description": "Request for prediction market top holders.",
-    "properties": {
-      "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: positionSize, unrealizedPnlUsd, avgEntryPrice."
-      },
-      "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/PredictionMarketTopHoldersRequest"
-  }
-]New value: +[
+  {
+    "additionalProperties": true,
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "description": "Request for prediction market top holders.",
+    "properties": {
+      "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: positionSize, unrealizedPnlUsd, avgEntryPrice."
+      },
+      "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"
+  }
+]

AddedMar 25, 2026

TDQS

A4.1/5.0

Behavior4/5

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

Annotations already declare read-only, non-destructive, open-world. The Pitfalls block still adds real value beyond them: the table is the source of truth, the summary reflects only shown rows, and labels/large positions must not be read as smart money. It doesn't mention pagination limits or how far the 'visible' table extends, which matters for a paginated holder list.

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 one-liner followed by labeled blocks, so an agent can stop after sentence one if it already knows the market ID. The "Key fields" block partly restates what the output schema already provides, which costs some of the budget.

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?

With annotations, a full output schema, and complete parameter documentation, the description only has to supply the reasoning constraints — and it does, via the pitfall about not inferring risk/PnL beyond explicit output. Only the pagination/row-count behavior for the 'visible table' caveat is left unspecified.

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?

Every parameter is documented in the schema (100% coverage), including the `orderBy` enum and default, so the description adds nothing on paging or sorting. The "Key fields" bullets describe output columns rather than inputs, so they don't compensate further on parameter meaning.

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 states a concrete verb and resource — "Largest current holders for a Polymarket market" — which pins both the operation and the domain. The Polymarket scoping directly distinguishes it from token_current_top_holders and from the address-level prediction market siblings such as prediction_market_address_pnl.

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?

The Prerequisites section gives an explicit routing rule: if `marketId` is unknown, call prediction_market_lookup first. It doesn't state any when-not-to-use conditions or contrast with prediction_market_position_detail / prediction_market_trades, so it stops short of full alternative routing.

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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