Agent-payable web data over x402: 18 keyless services an agent pays per call.
Connect Mercury to Claude, Cursor or any other MCP client and it stops being a tab you switch to. Agent-payable web data over x402: 18 keyless services an agent pays per call. The mercury mcp server is what makes that connection.
Tools include: clean fetch, LLM-ready markdown, structured extract, link graph, robots, diff, notarize, headers, table extract, feed, availability, validate, batch, sitemap, DNS, readability, redirect — built live from Mercury's catalog, so the list is always current.
Configuration is passed through the environment: MERCURY_PRIVATE_KEY. Treat anything key-shaped as a real credential — scope it to the minimum the server needs, and rotate it if it ever lands in a shared config.
Installation goes through your MCP client rather than a global install: point it at mercury-x402-mcp on npm and it is fetched when the client starts. The copy-paste blocks for Claude Desktop, Claude Code and Cursor are further down this page.
This sits in the developer tooling group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. It is maintained by mercuryx402; worth a glance at recent repository activity before you build anything load-bearing on it.
This entry was verified against Mercury's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.
{
"mcpServers": {
"mercury-x402": {
"command": "npx",
"args": ["-y", "mercury-x402-mcp"],
"env": {
"MERCURY_PRIVATE_KEY": "your-value"
}
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
| Variable | Description | Required |
|---|---|---|
| MERCURY_PRIVATE_KEY | Credential the server authenticates with. | Yes |
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