polymarket.trading.place_order

Place a limit order on Polymarket

SERVERApibase SOURCEapibase-mcp-client

Critical RISK CLASS

Category Financial

Parameters 74 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-whiteknightonhorse-apibase/polymarket.trading.place-order.md

WHAT IT DOES

What polymarket.trading.place_order does on Apibase

AI agents use polymarket.trading.place_order to commit financial operations through Apibase, usually the final step of a payment, billing, or trading workflow. A call moves real money.

Parameter	Type	Required	Description
`side`	string	Yes	Order side: buy or sell
`size`	number	Yes	Order size in USDC units
`price`	number	Yes	Limit price between 0.01 and 0.99
`neg_risk`	boolean	—	Whether this is a negative risk market
`token_id`	string	Yes	Polymarket CLOB token ID to trade
`tick_size`	string	—	Minimum price increment (e.g. 0.01, 0.001)
`order_type`	string	—	Order type: Good-Til-Cancelled, Good-Til-Date, Fill-Or-Kill

Parameters from the server's own tool schema.

RISK

Why polymarket.trading.place_order is rated Critical

Places financial orders on a prediction market, directly committing funds.

From the tool's definition Place a limit order on Polymarket

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs polymarket.trading.place_order safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Apibase, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For polymarket.trading.place_order, this is the rule to start with:

polymarket.trading.place_order Approval-gated

Any call to polymarket.trading.place_order is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "polymarket.trading.place_order": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Apibase, apply this rule, and every polymarket.trading.place_order call is checked against it from then on.

FAQ

Questions about polymarket.trading.place_order

What does the polymarket.trading.place_order tool do? +

Place a limit order on Polymarket. It is categorised as a Financial tool in the Apibase MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

What parameters does polymarket.trading.place_order accept? +

polymarket.trading.place_order accepts 7 parameters: side, size, price, neg_risk, token_id, tick_size, order_type. Required: side, size, price, token_id. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on polymarket.trading.place_order? +

Register the Apibase MCP server in PolicyLayer and add a rule for polymarket.trading.place_order: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Apibase. Nothing to install.

What risk level is polymarket.trading.place_order? +

polymarket.trading.place_order is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit polymarket.trading.place_order? +

Yes. Add a rate_limit block to the polymarket.trading.place_order rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block polymarket.trading.place_order completely? +

Set action: deny in the PolicyLayer policy for polymarket.trading.place_order. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides polymarket.trading.place_order? +

polymarket.trading.place_order is provided by the Apibase MCP server (apibase-mcp-client). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Apibase, and thousands of servers like it.

This server

All 1384 Apibase tools → Critical-risk tools on this server →

Across the catalogue

place_limit_order on Lighter MCP →place_order on MCP MetaTrader 4 Server →place_order on A2a Demos →order_pizza on MCP Chat → All critical-risk MCP tools → The MCP Attack Database →

Guides

Govern MCP payment tools →Human-in-the-loop →Tool call approval →