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Trader grades, whale-trade signals, smart-money flow, positions, and insider detection for Polymarket and Kalshi. The same data behind the 0xinsider terminal, as an API. Three ways in:
  • REST API: https://api.0xinsider.com/api/v1/ for bots, dashboards, and research code.
  • Local MCP server: @0xinsider/mcp on stdio for Claude Code, Cursor, Codex, Gemini CLI.
  • Remote MCP: streamable HTTP for agents that can’t run a local subprocess.
One Insider subscription covers all three.
Working in Claude Code, Cursor, or another AI agent? Feed it llms-full.txt, the whole docs site as one plain-text file. Drop it into context and ask the model to wire up calls, draft a bot, or surface ideas you can build on the data.

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What it solves

Polymarket and Kalshi publish raw trades. They don’t publish grades, signal scores, smart-money breakdowns, position timelines, or pattern detection. 0xinsider builds that layer. The API exposes it. So you can answer:
  • Which traders consistently beat the market on crypto resolution events?
  • Did anyone buy big into this market in the last hour, and are they sharp?
  • Is someone accumulating shares in a market that hasn’t resolved yet?
  • Where is smart money flowing this week?
  • What price did that S-grade trader get filled at?

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What you can build

  • Trading bots that fire on whale buys from S-grade traders in a category.
  • AI agents that summarize who’s winning, what they hold, and at what cost.
  • Research tools that pull leaderboards, trader profiles, history ranges, and category performance.
  • Dashboards that show where capital is rotating across prediction markets.
  • Webhooks that push whale-trade and radar events to your stack in real time.

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A real response

The top trader by composite score, right now: 
curl -H "Authorization: Bearer oxi_sk_live_..." \
  "https://api.0xinsider.com/api/v1/leaderboard?limit=1"

{
  "object": "list",
  "data": [
    {
      "id": "trd_0x863134d00841b2e200492805a01e1e2f5defaa53",
      "username": "RepTrump",
      "grade": "S",
      "score": 97.94,
      "pnl": 7532409.67,
      "win_rate": 1.0,
      "markets_traded": 28,
      "strategy_type": "swing_trader"
    }
  ],
  "has_more": true,
  "next_cursor": "97.94_0x863134d00841b2e200492805a01e1e2f5defaa53"
}
One trader. The leaderboard ranks thousands.

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Endpoints

Get Trader

Full profile for a wallet: grade, P&L, win rate, strategy, category strengths.

Batch Get Traders

Up to 25 trader profiles in one round trip.

Whale Trades

Recent large trades with signal scoring. Filter by grade, category, side.

Whale Trades History

Historical whale-trade ranges for backtesting and recap reports.

Positions

Current positions across traders or markets, with freshness metadata.

Position Timeline

Server-computed running amount and average entry price per fill.

Explore Markets

Browse whale-active titled markets by category, platform, status.

Market Intel

Smart-money flow direction and top positions for a single market.

Market Snapshot

One-shot market state with trust-metadata fields.

Leaderboard

Top traders by composite score, cursor-paginated.

Search Markets

Keyword search across markets with filters.

Insider Radar

Suspicious patterns: pre-resolution accumulation, unusual timing.

Event Replay

Replay missed feed events after a disconnection.

Webhooks

Push whale-trade and radar events to your endpoint.

Report Snapshots

Daily, weekly, monthly recap exports.

Remote MCP

Streamable HTTP MCP endpoint for hosted agents.

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Where to go next

Quickstart

Generate a key, fire your first request, and follow the whales end to end.

Local MCP Server

Plug 0xinsider into Claude Code, Cursor, Codex, or Gemini CLI in two minutes.

TypeScript Client

Drift-tested source client with typed errors and repeated expand params.

Trader Grades

What S, A, B, C, D, F actually mean, with real profile examples.