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OpenMayhem

Official registry AI and agents

Use OpenMayhem text, embedding and media models with explicit cost controls.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http openmayhem 'https://mcp.openmayhem.ai/mcp' --header 'X-OpenMayhem-API-Key: <A restricted OpenMayhem API key from your dashboard.>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "openmayhem": {
            "type": "http",
            "url": "https://mcp.openmayhem.ai/mcp",
            "headers": {
                "X-OpenMayhem-API-Key": "<A restricted OpenMayhem API key from your dashboard.>"
            }
        }
    }
}
MCPB package https://github.com/Trac-Systems/openmayhem-mcp/releases/download/v1.0.0/openmayhem-mcp-v1.0.0.mcpb

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. OpenMayhem MCP
  2. Install
  3. Billing
  4. Requirements
  5. License

OpenMayhem MCP

OpenMayhem's local stdio bridge forwards MCP messages to the hosted OpenMayhem service. It does not bundle a stale catalog: list_models and get_model read the live catalog, availability, capabilities, limits, routes, and prices from OpenMayhem. Account balance and payment logic remain on the hosted service, and the bridge contains no provider data or credentials.

Install

Download openmayhem-mcp-v1.0.0.mcpb from the v1.0.0 release and install it in an MCPB-compatible client. The client asks for a restricted OpenMayhem API key and stores it as a sensitive setting.

Clients that support remote Streamable HTTP can connect directly:

URL: https://mcp.openmayhem.ai/mcp
Header: X-OpenMayhem-API-Key: your restricted OpenMayhem API key

Create and revoke API keys at openmayhem.ai. Complete setup, tool, payment, and client instructions are at openmayhem.ai/docs/mcp.

Billing

Model discovery, request estimation, token counting, balance checks, job reads, cancellation, and owned-artifact lookup do not spend model credit. Model execution is paid. Every paid tool requires a current estimate and an explicit maximum cost.

The bridge does not calculate charges or handle payment information. Requests use the existing OpenMayhem account, balance, reservation, receipt, and settlement paths.

Requirements

  • Node.js 22 or newer
  • A restricted OpenMayhem API key
  • HTTPS access to mcp.openmayhem.ai

License

MIT

Frequently asked questions

What is OpenMayhem?

Use OpenMayhem text, embedding and media models with explicit cost controls.

How do I install OpenMayhem?

It runs as a remote server. In Claude Code: claude mcp add --transport http openmayhem 'https://mcp.openmayhem.ai/mcp' --header 'X-OpenMayhem-API-Key: <A restricted OpenMayhem API key from your dashboard.>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does OpenMayhem need an API key?

Yes. It expects X-OpenMayhem-API-Key, which you set in its configuration.

Is OpenMayhem open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains OpenMayhem?

It is published by Trac-Systems. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.