# Eden Engine > Eden Engine is a catalog of pay-per-call tools that an AI agent can use through one MCP connection. Its tool API and MCP server are called Omnial, which is why the tool names start with `omnial_`. You top up a prepaid balance, the agent searches the catalog, and each call is priced before it runs. Each tool names the company whose data it returns. A failed run is not charged. ## How an agent uses it 1. Search: `omnial_search` finds a tool by the words you would type. 2. Inspect: `omnial_inspect` returns the tool's input and output contract. 3. Learn: `omnial_learn` returns usage instructions written for an agent. 4. Price and run: `omnial_execute` quotes the call, holds the quoted amount, then runs it. 5. Settle: you are charged the call's final price, never more than the hold, and the rest of the hold is released. ## Adding funds - A signed-in person adds funds by card. The total to pay is shown before paying. A top-up is at most $2,000, and a day's top-ups together with the balance the day started with can come to at most $2,000 (UTC day). - Balance is prepaid credit for Eden Engine services. It is not money and never expires, except as unclaimed-property law requires. ## Links - [Install in your client](https://eden-engine.com/install.md): connection steps for MCP clients - [Agent skill file](https://eden-engine.com/SKILL.md): how to use the tools - [Documentation](https://eden-engine.com/docs) - [Pricing and billing](https://eden-engine.com/pricing) - [Prices and top-up rules as JSON](https://eden-engine.com/pricing.json) - [Terms summary as JSON](https://eden-engine.com/terms.json): the pages under /legal are the agreement - [Tool catalog](https://eden-engine.com/tools) - [Service status](https://eden-engine.com/status) - [OpenAPI document](https://mcp.eden-engine.com/v1/openapi.json): the REST API - MCP endpoint (streamable HTTP): https://mcp.eden-engine.com/mcp