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Penny Engine

Twelve free calculation and text tools for agents, over REST and MCP.

  • AI tool
  • Free

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Pricing

Free; a separate paid x402 service is described as not yet verified.

Overview

Penny Engine is a free service exposing twelve small deterministic tools that agents can call over REST or a remote MCP server. They cover margin, marketplace profit, target price and catalog auditing for ecommerce, cleaning quotes, campaign economics and subscription value, plus URL cleaning, slug making, JSON inspection, HTML extraction and CSV to JSON. No signup or key is needed. The site also lists a separate paid service using x402 payments, and says no payment from an outside customer has been confirmed yet.

Key features

  • Twelve deterministic tools, no signup
  • Remote MCP server and REST endpoints
  • Ecommerce margin, profit and catalog audit tools
  • URL cleanup, slug, JSON and HTML helpers
  • OpenAPI spec and tool catalog

Use cases

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Last updated 2026-10-18

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