position_size
Risk-based position sizing for trading agents: from account balance, risk per trade (percent or fixed amount), entry and stop price returns units to buy/sell, notional, leverage needed, stop distance, and with a target the reward:risk ratio, profit at target and break-even win rate. Optional fees...
This record as markdown: /tools/com-it-scorptech-x402/position-size.md
What position_size does on ScorpTech x402 API
AI agents call position_size to retrieve information from ScorpTech x402 API without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
feePct | number | — | Fee per side in percent of notional (included in the risk) |
lotSize | number | — | Round units down to this step (e.g. 0.001 BTC, 1 share) |
riskPct | number | — | Percent of the account to risk |
stopPrice | number | Yes | Stop loss; below entry = long, above = short |
entryPrice | number | Yes | |
riskAmount | number | — | Fixed amount to risk (overrides riskPct) |
targetPrice | number | — | Optional take-profit |
accountBalance | number | Yes | Account equity |
Parameters from the server's own tool schema.
Why position_size is rated Low
Even though position_size only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs position_size safely
PolicyLayer is an MCP gateway: it sits between your AI agents and ScorpTech x402 API, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For position_size, this is the rule to start with:
position_size is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect ScorpTech x402 API, apply this rule, and every position_size call is checked against it from then on.
Questions about position_size
Risk-based position sizing for trading agents: from account balance, risk per trade (percent or fixed amount), entry and stop price returns units to buy/sell, notional, leverage needed, stop distance, and with a target the reward:risk ratio, profit at target and break-even win rate. Optional fees and lot-size rounding. Price: $0.001 USDC per successful call (x402, Solana). Same tool over HTTPS: GET https://scorptech.it.com/api/x402/v1/position-size. It is categorised as a Read tool in the ScorpTech x402 API MCP Server, which means it retrieves data without modifying state.
position_size accepts 8 parameters: feePct, lotSize, riskPct, stopPrice, entryPrice, riskAmount, targetPrice, accountBalance. Required: stopPrice, entryPrice, accountBalance. The full parameter table on this page comes from the server's own tool schema.
Register the ScorpTech x402 API MCP server in PolicyLayer and add a rule for position_size: 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 ScorpTech x402 API. Nothing to install.
position_size is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the position_size 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.
Set action: deny in the PolicyLayer policy for position_size. 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.
position_size is provided by the ScorpTech x402 API MCP server (https://scorptech.it.com/api/x402/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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