# Table of Contents

- [OpenTools | The API for LLM tool use](#opentools-the-api-for-llm-tool-use)

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# OpenTools | The API for LLM tool use

![Background gradient](/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Fbg.bbd23e6b.avif&w=3840&q=100&dpl=dpl_HPnjzBsxBhuD3r97s27hyJa27UnQ)

The API for tool use
====================

Access the open ecosystem of [MCP](https://modelcontextprotocol.io/introduction)
 tools with one line of code using our completions API that supports every LLM.

Get early access

curlpythontypescript

`1curl -X POST https://api.opentools.com/v1/chat/completions 2-H "Authorization: Bearer <OPENTOOLS_API_KEY>" 3{ 4 "model": "google/gemini-2.0-flash-lite-001", 5 "messages": [ 6 { 7 "role": "user", 8 "content": "Help me book a 5-star hotel in the next 2 hours" 9 } 10 ], 11 "tools": [ 12 { "type": "mcp", "ref": "google-maps" } 13 ] 14}`

![OpenTools integration](/request-lifecycle.svg)

One API, every tool
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Browse our registry of MCP servers to augment your LLM with capabilities like web search, real-time location data, and web scraping. No personal API keys needed.

[See supported MCPs](/registry?category=api)

![Exa](/exa.svg)

![Brave](/brave.svg)

![Google Maps](/google-maps.svg)

![Firecrawl](/firecrawl.svg)

![Switch LLMs seamlessly](/multi-model.svg)

Switch LLMs seamlessly
----------------------

Use any LLM you want — your application stays resilient against outages. Our API is OpenAI-compatible and backwards compatible with traditional function calling.

[See supported LLMs](https://opentools.com/docs/supported-models)

![Transparent pricing](/transparent-pricing.svg)

Transparent pricing
-------------------

You only pay for tool execution because we charge tokens at-cost, all in one unified billing portal. No more juggling multiple LLM and external service accounts.

[See pricing](https://opentools.com/docs/tools-and-pricing)

Frequently asked questions

### What is MCP?

### What tools can I use with this API?

### Can I add my MCP server to be one your API supports?

Ready to build?
---------------

Join the beta

[Talk to the team](https://calendly.com/andy-opentools/15-mins-with-opentools)

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