# orders.buy

Buy outcome shares on a Polymarket market. Specify condition_id, USDC amount, and optionally a limit price. Runs a market quality check before executing. In preview mode, simulates the trade. In live mode, places a real CLOB order.

Agent View of the PolicyLayer registry record for `orders.buy`. HTML page: https://policylayer.com/tools/demwick-polymarket-agent-mcp/orders.buy

## Facts

- Tool: `orders.buy`
- Server: Polymarket Agent Mcp (`demwick/polymarket-agent-mcp`) — https://policylayer.com/tools/demwick-polymarket-agent-mcp.md
- Homepage: https://github.com/demwick/polymarket-agent-mcp
- Risk category: Financial (Critical risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Approval-gated

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "orders.buy",
    "arguments": {}
  }
}
```

## Why orders.buy is rated Critical

This tool directly executes financial transactions by purchasing outcome shares with real USDC funds on the Polymarket CLOB (Central Limit Order Book). It commits real capital to a trade, making it a Financial category tool.

From the tool's own definition: "In live mode, places a real CLOB order — buys outcome shares using USDC on Polymarket prediction markets"

## Use case

AI agents use orders.buy to commit financial operations through Polymarket Agent Mcp, usually the final step of a payment, billing, or trading workflow. A call moves real money.

## Recommended policy (PolicyLayer)

Verdict: **Approval-gated**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Polymarket Agent Mcp:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "orders.buy": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}
```

## Other tools on Polymarket Agent Mcp (47)

- `orders.cancel` — Destructive — https://policylayer.com/tools/demwick-polymarket-agent-mcp/orders.cancel.md
- `watchlist.rebalance` — Destructive — https://policylayer.com/tools/demwick-polymarket-agent-mcp/watchlist.rebalance.md
- `monitor.start` — Execute — https://policylayer.com/tools/demwick-polymarket-agent-mcp/monitor.start.md
- `monitor.stop` — Execute — https://policylayer.com/tools/demwick-polymarket-agent-mcp/monitor.stop.md
- `traders.backtest` — Execute — https://policylayer.com/tools/demwick-polymarket-agent-mcp/traders.backtest.md
- `config.go_live` — Financial — https://policylayer.com/tools/demwick-polymarket-agent-mcp/config.go-live.md
- `orders.batch` — Financial — https://policylayer.com/tools/demwick-polymarket-agent-mcp/orders.batch.md
- `orders.sell` — Financial — https://policylayer.com/tools/demwick-polymarket-agent-mcp/orders.sell.md
- `positions.check_exits` — Financial — https://policylayer.com/tools/demwick-polymarket-agent-mcp/positions.check-exits.md
- `positions.close` — Financial — https://policylayer.com/tools/demwick-polymarket-agent-mcp/positions.close.md
- `wta.bid` — Financial — https://policylayer.com/tools/demwick-polymarket-agent-mcp/wta.bid.md
- `agent.log_cycle` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/agent.log-cycle.md
- `dashboard.get` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/dashboard.get.md
- `flow.discover` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/flow.discover.md
- `markets.analyze` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/markets.analyze.md
- `markets.arbitrage` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/markets.arbitrage.md
- `markets.check` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/markets.check.md
- `markets.compare` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/markets.compare.md
- `markets.discover` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/markets.discover.md
- `markets.events` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/markets.events.md
- `markets.featured` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/markets.featured.md
- `markets.holders` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/markets.holders.md
- `markets.price` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/markets.price.md
- `markets.price_history` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/markets.price-history.md
- `markets.related` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/markets.related.md
- `markets.search` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/markets.search.md
- `markets.trending` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/markets.trending.md
- `markets.watch_price` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/markets.watch-price.md
- `orders.list` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/orders.list.md
- `orders.status` — Read — https://policylayer.com/tools/demwick-polymarket-agent-mcp/orders.status.md
- …and 17 more: https://policylayer.com/tools/demwick-polymarket-agent-mcp.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=demwick-polymarket-agent-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/demwick-polymarket-agent-mcp