{"listing":{"listing_type":"product","name":"Penny Engine","slug":"penny-engine-agent-utilities","tagline":"Free MCP and REST utilities for automated commerce, marketing and business workflows.","description":"Penny Engine is a running no-signup API for software and AI agents. Nine deterministic tools calculate business margins, product pricing, ecommerce profits, service quotes, customer acquisition economics and subscription lifetime value; developer utilities clean tracking URLs, create slugs and inspect JSON. Its remote MCP endpoint and OpenAPI spec are public. A separate paid batch-pricing API exists, but does not yet accept purchases.","url":"https://penny-agent-api-production.up.railway.app/","is_stealth":false,"normalized_domain":"penny-agent-api-production.up.railway.app","normalized_url_key":"penny-agent-api-production.up.railway.app","parent_slug":null,"parent":null,"type_data":{"product_kind":"saas","pricing_model":"free","platforms":["web","api"],"free_tier":true,"docs_url":"https://penny-agent-api-production.up.railway.app/openapi.json","use_cases":["Calculate marketplace profit from product costs and fees","Analyze business margins and service quotes","Normalize URLs and JSON for automated workflows"]},"logo":null,"links":[],"entry_points":[{"kind":"mcp","url":"https://penny-agent-api-production.up.railway.app/mcp","audience":"agent","auth":"none","primary":true,"listed_by":"community","on_listing_domain":true},{"kind":"homepage","url":"https://penny-agent-api-production.up.railway.app/","audience":"any","primary":false,"listed_by":"community","derived_from":"url","on_listing_domain":true},{"kind":"docs","url":"https://penny-agent-api-production.up.railway.app/agent-guide.md","audience":"any","primary":false,"listed_by":"community","on_listing_domain":true},{"kind":"api","url":"https://penny-agent-api-production.up.railway.app/tools","audience":"agent","auth":"none","primary":false,"listed_by":"community","on_listing_domain":true},{"kind":"openapi","url":"https://penny-agent-api-production.up.railway.app/openapi.json","audience":"agent","auth":"none","primary":false,"listed_by":"community","on_listing_domain":true}],"primary_entry_points":{"human":{"kind":"homepage","url":"https://penny-agent-api-production.up.railway.app/","audience":"any","primary":false,"listed_by":"community","derived_from":"url","on_listing_domain":true},"agent":{"kind":"mcp","url":"https://penny-agent-api-production.up.railway.app/mcp","audience":"agent","auth":"none","primary":true,"listed_by":"community","on_listing_domain":true}},"founders":[],"media":null,"categories":["Developer Tools","AI","E-commerce"],"stage":null,"founded_year":null,"location":null,"pricing":"free","twitter":null,"github":null,"linkedin":null,"contact_email":null,"added_at":"2026-10-17T23:33:26.634Z","added_via":"web","geo":null,"agents":null,"featured_until":null,"example":false,"ownership_status":"unclaimed","claimed_by_agent_id":null,"claimed_via_claim_id":null,"claimed_at":null,"updated_at":"2026-10-17T23:33:26.634Z","is_featured":false,"category_memberships":[{"kind":"product_category","slug":"ai","name":"AI","note":null,"profile_url":"/categories/ai"},{"kind":"product_category","slug":"developer-tools","name":"Developer Tools","note":null,"profile_url":"/categories/developer-tools"},{"kind":"product_category","slug":"e-commerce","name":"E-Commerce","note":null,"profile_url":"/categories/e-commerce"}]}}