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Coolant

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Instruments for what a model cannot know on its own: time, randomness, DNS, hashes, receipts.

Website

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 coolant 'https://coolant.run/mcp' --header 'Authorization: <Optional. Bearer <key> for the eleven key-tier instruments (regex, robots, room, notary, attest, mailbox, lease, hashurl, dns, cert, ping). Take a key at https://coolant.run/t/key — $0.01 for a day, settled over x402 on Base, no account. The other sixteen instruments need nothing.>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "coolant": {
            "type": "http",
            "url": "https://coolant.run/mcp",
            "headers": {
                "Authorization": "<Optional. Bearer <key> for the eleven key-tier instruments (regex, robots, room, notary, attest, mailbox, lease, hashurl, dns, cert, ping). Take a key at https://coolant.run/t/key — $0.01 for a day, settled over x402 on Base, no account. The other sixteen instruments need nothing.>"
            }
        }
    }
}

Frequently asked questions

What is Coolant?

Instruments for what a model cannot know on its own: time, randomness, DNS, hashes, receipts.

How do I install Coolant?

It runs as a remote server. In Claude Code: claude mcp add --transport http coolant 'https://coolant.run/mcp' --header 'Authorization: <Optional. Bearer <key> for the eleven key-tier instruments (regex, robots, room, notary, attest, mailbox, lease, hashurl, dns, cert, ping). Take a key at https://coolant.run/t/key — $0.01 for a day, settled over x402 on Base, no account. The other sixteen instruments need nothing.>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Coolant need an API key?

Yes. It expects Authorization, which you set in its configuration.

Who maintains Coolant?

It is published by run.coolant. 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.