# Polymarket Whale Activity by Market

> Polymarket Whale Activity by Market is a paid API for AI agents from x402-api-production-266e.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Returns 7-day whale trading activity for a specific Polymarket prediction market, including aggregate volume, YES/NO split, net flow, unique whale wallets, and up to 200 individual trades.

## Facts

- Endpoint: GET https://x402-api-production-266e.up.railway.app/v1/whales/market/:conditionId
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polymarket-whale-activity-by-market-5e6b7bb8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LU0C5sX-v-2kK18qyluhZ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability polymarket-whale-activity-by-market-5e6b7bb8
```

Example prompt: Show me what the whales have been doing on the Polymarket market with condition ID 0x1234...abcd over the past week — I want to see the volume, which side they're on, and the individual trades.

## When to prefer this

Use this endpoint when you need deep whale-level analysis for a single specific Polymarket market identified by its condition ID. Prefer this over the daily digest endpoint when you need full trade-level detail (up to 200 trades) and per-market granularity rather than cross-market summaries. Best for tracking smart money positioning on a particular event or question.

## Known failure modes

- Invalid or malformed conditionId returns an error response
- Unknown conditionId with no whale activity returns empty or minimal result
- Network timeout if the upstream Polymarket data pipeline is delayed
- Payment not received (402) if the $0.01 USDC x402 payment header is missing or invalid
- Rate limiting if too many requests are made in quick succession

## How this service works

Whale activity for one Polymarket market over the last 7 days (15 min delay). Path param: conditionId (0x… Polymarket condition id). Returns market info, aggregate whale volume, YES/NO split, net flow, unique whale wallets, and up to 200 trades.

## Output

Returns structured JSON with market metadata, total whale volume aggregated over 7 days, YES and NO volume breakdown, net directional flow, count of unique whale wallets, and a list of up to 200 individual whale trades (trades >= $10,000) with market, side, size, and price details. Data has a 15-minute delay.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/polymarket-whale-activity-by-market-5e6b7bb8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-api-production-266e.up.railway.app](https://www.zero.xyz/host/x402-api-production-266e.up.railway.app/llms.txt)