# MCPFax Markets — Polymarket Trader Leaderboard

> MCPFax Markets — Polymarket Trader Leaderboard is a paid API for AI agents from mcpfax-markets.bowling-anthony.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Returns the Polymarket trader leaderboard, ranking top prediction-market traders by performance metrics.

## Facts

- Endpoint: GET https://mcpfax-markets.bowling-anthony.workers.dev/polymarket/leaderboard
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mcpfax-markets-polymarket-trader-leaderboard-32bf54bc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zbcTWO6L5Pghv47aY5Ddw

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 mcpfax-markets-polymarket-trader-leaderboard-32bf54bc
```

Example prompt: Who are the top traders on Polymarket right now? Pull up the leaderboard and show me the highest-ranked participants by profit.

## When to prefer this

Use this endpoint when you need ranked trader performance data from Polymarket specifically, such as identifying top predictors, researching high-performing wallets, or monitoring competitive standing on the platform. Prefer this over general DeFi endpoints when the focus is prediction-market trader rankings rather than token prices, TVL, or yield data.

## Known failure modes

- Polymarket API unavailable or rate-limited, returning an upstream error
- No leaderboard data available for the requested time period
- Payment of 0.001 USDC not processed, resulting in 402 payment required response
- Malformed request parameters returning a 400 bad request

## How this service works

MCPFax markets — Polymarket trader leaderboard (polymarket_leaderboard). Price: $0.001 USDC per call on Base.

## Output

A ranked list of Polymarket traders including wallet addresses, profit/loss figures, trading volume, and other performance metrics used to rank participants on the prediction market platform.

## 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"
    },
    "queryParams": {
     "type": "object"
    }
   },
   "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/mcpfax-markets-polymarket-trader-leaderboard-32bf54bc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcpfax-markets.bowling-anthony.workers.dev](https://www.zero.xyz/host/mcpfax-markets.bowling-anthony.workers.dev/llms.txt)