MCP server · MERCURY

mercury-x402

MERCURY ships a real, hosted Model Context Protocol server AND a first-party stdio package. The hosted server at https://network.mercury-hq.com/mcp answers GET with a descriptor ({name: mercury-x402, transport: streamable-http, endpoint: "POST /mcp (JSON-RPC 2.0)", tools: 18}), completes initialize (protocolVersion 2025-06-18, capabilities {tools: {}}, instructions "tools/list is free; tools/call needs a Mercury API key (Authorization: Bearer mk_...)") and returns 18 tools from tools/list without credentials, each with a JSON Schema inputSchema that matches the query parameters of the backing /buy/* operation in the OpenAPI. tools/call is gated by a Mercury API key; a free mk_test_ key is issued at /developers (POST /api/dev/keys?live=false). The npm package mercury-x402-mcp (bin mercury-x402-mcp, deps @modelcontextprotocol/sdk, viem, x402-fetch) runs the same catalog locally over stdio and pays per call from the operator's own Base wallet (env MERCURY_PRIVATE_KEY) instead of an API key; its README says the tool list is "built live from Mercury's catalog" and adds free mercury_catalog and mercury_verify tools.

Open endpoint → MERCURY provider profile

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Provider: MERCURY Type: Hosted endpoint Transport: http Host: network.mercury-hq.com

Endpoint

https://network.mercury-hq.com/mcp

Hosted endpoint · transport http

Connect

This is a remote MCP server — point an MCP client at the endpoint URL. Clients with native remote support (Claude, Cursor, VS Code, …):

# mcp client config (e.g. .mcp.json / mcp settings) { "mcpServers": { "mercury-hq-com": { "url": "https://network.mercury-hq.com/mcp" } } }

For stdio-only clients (older Claude Desktop, etc.), bridge with mcp-remote:

# Add to claude_desktop_config.json { "mcpServers": { "mercury-hq-com": { "command": "npx", "args": ["-y", "mcp-remote", "https://network.mercury-hq.com/mcp"] } } }

If the server requires authentication, add the provider's token/header (e.g. an X-API-Key) per its docs. A quick reachability check:

curl -i -X POST https://network.mercury-hq.com/mcp \ -H "Content-Type: application/json" -H "Accept: application/json, text/event-stream" \ -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

Tools

fetch — Verifiable keyless web-read - clean page text + title + status + signed provenance receipt; ?format=markdown, ?links=1, ?extract=
extract — URL + schema -> typed, schema-conformant JSON record
markdown — URL -> clean LLM-ready markdown with signed receipt
metadata — URL -> signed metadata record (JSON-LD, OpenGraph, Twitter card, meta, canonical, title)
links — URL -> signed outbound/internal link graph
robots — Domain -> signed per-AI-crawler allow/block audit from robots.txt, llms.txt, ai.txt
diff — URL + prior hash/text -> signed change-proof fromHash->toHash
notarize — Notarize inline content or a fetched URL into a signed receipt
headers — URL -> deterministic HTTP security-headers audit with letter grade
table — URL -> HTML tables as typed JSON rows + RFC 4180 CSV
feed — RSS/Atom URL -> signed normalized item list
availability — URL -> signed up/down probe with status, final URL, responseMs
validate — JSON endpoint + JSON Schema -> signed pass/fail with per-field errors
batch — <=20 URLs -> clean content each + one receipt over a Merkle root
sitemap — Domain/URL -> signed snapshot of the published sitemap
dns — Domain -> signed DNS snapshot (A, AAAA, MX, NS, TXT, CNAME, SOA)
readability — URL -> clean article record {title, byline, publishedAt, text}
redirect — URL -> signed redirect/canonical hop chain

About MCP

The Model Context Protocol (MCP) is an open protocol Anthropic introduced for connecting LLM-based agents to external tools and data sources. Providers publish MCP servers that expose their API surface as structured, discoverable tools — an MCP-compatible client (Claude Desktop, Cursor, Cline, Continue, etc.) can connect to the server and call its tools without any per-provider integration code.

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