math_eval
Evaluate math expressions safely and exactly — the calculator agents should call instead of doing arithmetic in their heads. Exact rational arithmetic by default (0.1 + 0.2 = 3/10, 1/3 + 1/6 = 1/2, 2^200 and 1000! in full), with repeating-decimal notation, plus floating point for transcendental f...
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What math_eval does on ScorpTech x402 API
AI agents call math_eval 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 |
|---|---|---|---|
expr | string | Yes | Expression, or statements separated by ";" (assign with name = expr; the last value is returned) |
mode | string | — | auto: exact rationals whenever possible; float: IEEE double throughout |
vars | string | — | Variables, e.g. "x=2, rate=0.05" or a JSON object |
angle | string | — | |
digits | integer | — | Decimal places in the "decimal" string |
Parameters from the server's own tool schema.
Why math_eval is rated Low
Even though math_eval 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.
Risk signalsAdmin/system-level operation
Attacks that exploit this kind of access
The rule that runs math_eval 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 math_eval, this is the rule to start with:
math_eval 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 math_eval call is checked against it from then on.
Questions about math_eval
Evaluate math expressions safely and exactly — the calculator agents should call instead of doing arithmetic in their heads. Exact rational arithmetic by default (0.1 + 0.2 = 3/10, 1/3 + 1/6 = 1/2, 2^200 and 1000! in full), with repeating-decimal notation, plus floating point for transcendental functions: sqrt, cbrt, root, exp, ln, log (base 10, or log(x, b)), log2, trig and hyperbolic functions (radians or degrees), gamma, erf, factorial, nCr / nPr, gcd / lcm, mod, min / max / sum / mean / median, round(x, digits), comparisons. Implicit multiplication (2pi, 3(x+1)), variables, and multi-statement scripts ("r = 2; pi r^2"). No code execution. Price: $0.001 USDC per successful call (x402, Solana). Same tool over HTTPS: GET https://scorptech.it.com/api/x402/v1/math-eval. It is categorised as a Read tool in the ScorpTech x402 API MCP Server, which means it retrieves data without modifying state.
math_eval accepts 5 parameters: expr, mode, vars, angle, digits. Required: expr. 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 math_eval: 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.
math_eval 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 math_eval 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 math_eval. 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.
math_eval 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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